2021/07/06 更新

写真b

トガノ ヤスヒロ
栂野 泰宏
TOGANO Yasuhiro
*大学が定期的に情報更新している項目(その他は、researchmapの登録情報を転載)
所属*
理学部 物理学科
職名*
助教
連絡先
メールアドレス
研究キーワード
  • 放射線検出器

  • 核反応

  • 不安定核

  • 天体核物理

  • 原子核物理学

  • 学内職務経歴*
    • 2017年4月 - 現在 
      理学部   物理学科   助教
     

    研究分野

    • 自然科学一般 / 素粒子、原子核、宇宙線、宇宙物理にする理論

    経歴

    • 2017年4月 - 現在 
      立教大学   理学部 物理学科   助教

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    • 2016年4月 - 2017年3月 
      東京工業大学   理学院物理学系   特任助教

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    • 2012年10月 - 2016年3月 
      東京工業大学   理工学研究科基礎物理学専攻   特任助教

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    • 2011年10月 - 2012年9月 
      Extreme Matter Institute EMMI   Postdoctoral fellow

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    • 2008年10月 - 2011年9月 
      独立行政法人理化学研究所   本林重イオン核物理研究室   基礎科学特別研究員

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    • 2008年4月 - 2008年9月 
      立教大学   理学部   ポストドクトラルフェロー

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    • 2005年4月 - 2008年3月 
      立教大学   理学部   日本学術振興会特別研究員

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    ▼全件表示

    学歴

    • - 2008年3月 
      立教大学   理学研究科   物理学専攻

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      国名: 日本国

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    • 1999年4月 - 2003年3月 
      立教大学   理学部   物理学科

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      国名: 日本国

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    受賞

    • 2018年9月  
      The Nuclear Physics European Collaboration Committee  EMIS2018 Best Poster Award  New γ-ray detector CATANA for in-beam γ-ray spectroscopy with fast RI beams
       
      Y. Togano, T. Nakamura, Y. Kondo, M. Shikata, T. Ozaki, A.T. Saito, T. Tomai, M. Yasuda, H. Yamada, N. Chiga, H. Otsu, V. Panin, Y. Zaihong, Y. Fujino

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      受賞区分:国際学会・会議・シンポジウム等の賞 

      受賞国:スイス連邦

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    論文

    • Probing the Z=6 spin-orbit shell gap with (p, 2p) quasi-free scattering reactions 査読有り

      I.Syndikus, M.Petri, A.O.Macchiavelli, S.Paschalis, C.A.Bertulani, T.Aumann, H.Alvarez-Pol, L.Atar, S.Beceiro Novo, J.Benlliure, J.M.Boillos, K.Boretzky, M.J.G.Borge, B.A.Brown, M.Caamano, C.Caesar, E.Casarejos, W.Catford, J.Cederkall, S.Chakraborty, L.V.Chulkov, D.Cortina-Gil, E.Cravo, R.Crespo, U.Datta Pramanik, I.Dillmann, P.Diaz Fernandez, Z.Elekes, J.Enders, F.Farinon, L.M.Fraile, D.Galaviz, H.Geissel, R.Gernhauser, P.Golubev, K.Gobel, M.Heil, M.Heine, A.Heinz, A.Henriques, M.Holl, H.T.Joha

      Physics Letters B809   135748   2020年10月10日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier  

      DOI: 10.1016/j.physletb.2020.135748

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    • Electric and magnetic dipole strength in 112, 114, 116, 118, 120, 124Sn 査読有り

      S.Bassauer, P.von Neumann-Cosel, P.-G.Reinhard, A.Tamii, S.Adachi, C.A.Bertulani, P.Y.Chan, A.D'Alessio, H.Fujioka, H.Fujita, Y.Fujita, G.Gey, M.Hilcker, T.H.Hoang, A.Inoue, J.Isaak, C.Iwamoto, T.Klaus, N.Kobayashi, Y.Maeda, M.Matsuda, N.Nakatsuka, S.Noji, H.J.Ong, I.Ou, N.Pietralla, V.Yu.Ponomarev, M.S.Reen, A.Richter, M.Singer, G.Steinhilber, T.Sudo, Y.Togano, M.Tsumura, Y.Watanabe, V.Werner

      Physical Review C102   034327   2020年9月28日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Physical Society  

      DOI: 10.1103/PhysRevC.102.034327

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    • Halo Structure of the Neutron-Dripline Nucleus 19B 査読有り

      K.J.Cook, T.Nakamura, Y.Kondo, K.Hagino, K.Ogata, A.T.Saito, N.L.Achouri, T.Aumann, H.Baba, F.Delaunay, Q.Deshayes, P.Doornenbal, N.Fukuda, J.Gibelin, J.W.Hwang, N.Inabe, T.Isobe, D.Kameda, D.Kanno, S.Kim, N.Kobayashi, T.Kobayashi, T.Kubo, S.Leblond, J.Lee, F.M.Marques, R.Minakata, T.Motobayashi, K.Muto, T.Murakami, D.Murai, T.Nakashima, N.Nakatsuka, A.Navin, S.Nishi, S.Ogoshi, N.A.Orr, H.Otsu, H.Sato, Y.Satou, Y.Shimizu, H.Suzuki, K.Takahashi, H.Takeda, S.Takeuchi, R.Tanaka, Y.Togano, J.Tsubota

      Physical Review Letters124   212503   2020年5月27日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Physical Society  

      DOI: 10.1103/PhysRevLett.124.212503

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    • Extending the Southern Shore of the Island of Inversion to 28F 査読有り

      A.Revel, Y.Togano

      Physical Review Letters124   152502   2020年4月16日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Physical Society  

      DOI: 10.1103/PhysRevLett.124.152502

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    • g Factor of the 99Zr(7/2+) Isomer: Monopole Evolution in the Shape-Coexisting Region 査読有り

      F.Boulay, G.S.Simpson, Y.Ichikawa, S.Kisyov, D.Bucurescu, A.Takamine, D.S.Ahn, K.Asahi, H.Baba, D.L.Balabanski, T.Egami, T.Fujita, N.Fukuda, C.Funayama, T.Furukawa, G.Georgiev, A.Gladkov, M.Hass, K.Imamura, N.Inabe, Y.Ishibashi, T.Kawaguchi, T.Kawamura, W.Kim, Y.Kobayashi, S.Kojima, A.Kusoglu, R.Lozeva, S.Momiyama, I.Mukul, M.Niikura, H.Nishibata, T.Nishizaka, A.Odahara, Y.Ohtomo, D.Ralet, T.Sato, Y.Shimizu, T.Sumikama, H.Suzuki, H.Takeda, L.C.Tao, Y.Togano, D.Tominaga, H.Ueno, H.Yamazaki, X.F.Y

      Physical Review Letters124   212503   2020年3月16日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Physical Society  

      DOI: 10.1103/PhysRevLett.124.112501

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    • Restoration of the natural E(1/2+1)-E(3/2+1) energy splitting in odd-K isotopes towards N = 40 査読有り

      Y.L.Sun, A.Obertelli, P.Doornenbal, C.Barbieri, Y.Chazono, T.Duguet, H.N.Liu, P.Navratil, F.Nowacki, K.Ogata, T.Otsuka, F.Raimondi, V.Soma, Y.Utsuno, K.Yoshida, N.Achouri, H.Baba, F.Browne, D.Calvet, F.Chateau, S.Chen, N.Chiga, A.Corsi, M.L.Cortes, A.Delbart, J.-M.Gheller, A.Giganon, A.Gillibert, C.Hilaire, T.Isobe, T.Kobayashi, Y.Kubota, V.Lapoux, T.Motobayashi, I.Murray, H.Otsu, V.Panin, N.Paul, W.Rodriguez, H.Sakurai, M.Sasano, D.Steppenbeck, L.Stuhl, Y.Togano, T.Uesaka, K.Wimmer, K.Yoneda, O

      Physics Letters B802   135215   2020年3月10日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier  

      DOI: 10.1016/j.physletb.2020.135215

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    • New gamma-ray detector CATANA for in-beam gamma-ray spectroscopy with fast RI beams 査読有り

      Y. Togano, T. Nakamura, Y. Kondo, M. Shikata, T. Ozaki, A. T. Saito, T. Tomai, M. Yasuda, H. Yamada, N. Chiga, H. Otsu, V. Panin, Y. Zaihong, Y. Fujino

      Nuclear Instruments and methods in physics research section B463   195 - 197   2020年1月15日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier  

      DOI: 10.1016/j.nimb.2019.05.049

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    • Fragmentation of Single-Particle Strength around the Doubly Magic Nucleus 132Sn and the Position of the 0f5/2 Proton-Hole State in 131In 査読有り

      V.Vaquero, A.Jungclaus, T.Aumann, J.Tscheuschner, E.V.Litvinova, J.A.Tostevin, H.Baba, D.S.Ahn, R.Avigo, K.Boretzky, A.Bracco, C.Caesar, F.Camera, S.Chen, V.Derya, P.Doornenbal, J.Endres, N.Fukuda, U.Garg, A.Giaz, M.N.Harakeh, M.Heil, A.Horvat, K.Ieki, N.Imai, N.Inabe, N.Kalantar-Nayestanaki, N.Kobayashi, Y.Kondo, S.Koyama, T.Kubo, I.Martel, M.Matsushita, B.Million, T.Motobayashi, T.Nakamura, N.Nakatsuka, M.Nishimura, S.Nishimura, S.Ota, H.Otsu, T.Ozaki, M.Petri, R.Reifarth, J.L.Rodriguez-Sanche

      Physical Review C124   022501   2020年1月13日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:APS  

      DOI: 10.1103/physrevlett.124.022501

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    • Shell evolution of N=40 isotones towards 60Ca: First spectroscopy of 62Ti 査読有り

      M.L.Cortes, W.Rodriguez, P.Doornenbal, A.Obertelli, J.D.Holt, S.M.Lenzi, J.Menendez, F.Nowacki, K.Ogata, A.Poves, T.R.Rodriguez, A.Schwenk, J.Simonis, S.R.Stroberg, K.Yoshida, L.Achouri, H.Baba, F.Browne, D.Calvet, F.Chateau, S.Chen, N.Chiga, A.Corsi, A.Delbart, J.-M.Gheller, A.Giganon, A.Gillibert, C.Hilaire, T.Isobe, T.Kobayashi, Y.Kubota, V.Lapoux, H.N.Liu, T.Motobayashi, I.Murray, H.Otsu, V.Panin, N.Paul, H.Sakurai, M.Sasano, D.Steppenbeck, L.Stuhl, Y.L.Sun, Y.Togano, T.Uesaka, K.Wimmer, K

      Physics Letters B800   135071   2020年1月10日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier  

      DOI: 10.1016/j.physletb.2019.135071

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    • Boron Isotopes at the Drip-Line: The (formula presented) Case 査読有り

      J. Gibelin, S. Leblond, F. M. Marqués, N. A. Orr, Y. Kondo, T. Nakamura, J. Bonnard, N. Michel, N. L. Achouri, T. Aumann, H. Baba, F. Delaunay, P. Doornenbal, N. Fukuda, J. W. Hwang, N. Inabe, T. Isobe, D. Kameda, D. Kanno, S. Kim, N. Kobayashi, T. Kobayashi, T. Kubo, J. Lee, R. Minakata, T. Motobayashi, D. Murai, T. Murakami, K. Muto, T. Nakashima, N. Nakatsuka, A. Navin, S. Nishi, S. Ogoshi, H. Otsu, H. Sato, Y. Satou, Y. Shimizu, H. Suzuki, K. Takahashi, H. Takeda, S. Takeuchi, R. Tanaka, Y. Togano, A. G. Tuff, M. Vandebrouck, K. Yoneda

      Springer Proceedings in Physics238   103 - 107   2020年

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      掲載種別:研究論文(国際会議プロシーディングス)  

      © Springer Nature Switzerland AG 2020. We report here results for SAMURAI Dayone campaign which, by using knock-out reaction and invariant mass method, allowed to obtain the first measurement of exited states of the most neutron rich boron isotope (formula presented)B.

      DOI: 10.1007/978-3-030-32357-8_18

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    • Observation of New Neutron Resonances in (formula presented) 査読有り

      Y. Satou, S. Kim, J. W. Hwang, N. A. Orr, T. Nakamura, Y. Kondo, J. Gibelin, N. L. Achouri, T. Aumann, H. Baba, F. Delaunay, P. Doornenbal, N. Fukuda, N. Inabe, T. Isobe, D. Kameda, D. Kanno, N. Kobayashi, T. Kobayashi, T. Kubo, S. Leblond, J. Lee, F. M. Marqués, R. Minakata, T. Motobayashi, D. Murai, T. Murakami, K. Muto, T. Nakashima, N. Nakatsuka, A. Navin, S. Nishi, S. Ogoshi, H. Otsu, H. Sato, Y. Shimizu, H. Suzuki, K. Takahashi, H. Takeda, S. Takeuchi, R. Tanaka, Y. Togano, A. G. Tuff, M. Vandebrouck, K. Yoneda

      Springer Proceedings in Physics238   125 - 130   2020年

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      掲載種別:研究論文(国際会議プロシーディングス)  

      © Springer Nature Switzerland AG 2020. High-lying isolated neutron resonances have been observed in (formula presented). Analyses of the decay properties utilizing shell-model calculations suggest that they could be interpreted as possible variants of proton core excited states. The spins of these states are likely to be originating from anti-parallel coupling of spins of the (formula presented) neutron and the proton (formula presented) state in the assumed respective core nuclei, (formula presented).

      DOI: 10.1007/978-3-030-32357-8_22

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    • Enhancement of element production by incomplete fusion reaction with weakly bound deuteron 査読有り

      H. Wang, H. Otsu, N. Chiga, S. Kawase, S. Takeuchi, T. Sumikama, S. Koyama, H. Sakurai, Y. Watanabe, S. Nakayama, D. S. Ahn, H. Baba, S. D. Chen, K. Chikaato, M. L. Cortés, N. Fukuda, A. Hirayama, R. Hosoda, T. Isobe, S. Kawakami, Y. Kondo, S. Kubono, Y. Maeda, S. Masuoka, S. Michimasa, I. Murray, R. Nakajima, T. Nakamura, K. Nakano, M. Nishimura, T. Ozaki, A. Saito, T. Saito, H. Sato, Y. Shimizu, S. Shimoura, P. A. Söderström, Y. Soudo, X. H. Sun, J. Suwa, D. Suzuki, H. Suzuki, H. Takeda, M. Takechi, Y. Togano, T. Tomai, H. Yamada, M. Yasuda, K. Yoshida

      Communications Physics2 ( 1 ) 78   2019年12月1日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)  

      © 2019, The Author(s). Searching for effective pathways for the production of proton-rich and neutron-rich isotopes is one of the main driving forces behind experimental and theoretical nuclear reaction studies as well as for practical applications in nuclear transmutation of radioactive waste. To produce nuclei effectively, an optimal combination of reaction mechanism and energy is required. We report a study on incomplete fusion induced by deuteron, which contains one proton and one neutron with a weak binding energy and is easily broken up. This reaction study was achieved by measuring directly the cross sections for both proton and deuteron for 107Pd at 50 MeV/u via inverse kinematics technique. The results provide direct experimental evidence for the onset of a cross-section enhancement at high energy, indicating the potential for incomplete fusion induced by loosely-bound nuclei for creating proton-rich isotopes and nuclear transmutation of radioactive waste.

      DOI: 10.1038/s42005-019-0165-1

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    • Structure of <sup>13</sup>Be probed via quasi-free scattering 査読有り

      A. Corsi, Y. Kubota, J. Casal, M. Gómez-Ramos, A. M. Moro, G. Authelet, H. Baba, C. Caesar, D. Calvet, A. Delbart, M. Dozono, J. Feng, F. Flavigny, J. M. Gheller, J. Gibelin, A. Giganon, A. Gillibert, K. Hasegawa, T. Isobe, Y. Kanaya, S. Kawakami, D. Kim, Y. Kiyokawa, M. Kobayashi, N. Kobayashi, T. Kobayashi, Y. Kondo, Z. Korkulu, S. Koyama, V. Lapoux, Y. Maeda, F. M. Marqués, T. Motobayashi, T. Miyazaki, T. Nakamura, N. Nakatsuka, Y. Nishio, A. Obertelli, A. Ohkura, N. A. Orr, S. Ota, H. Otsu, T. Ozaki, V. Panin, S. Paschalis, E. C. Pollacco, S. Reichert, J. Y. Rousse, A. T. Saito, S. Sakaguchi, M. Sako, C. Santamaria, M. Sasano, H. Sato, M. Shikata, Y. Shimizu, Y. Shindo, L. Stuhl, T. Sumikama, Y. L. Sun, M. Tabata, Y. Togano, J. Tsubota, T. Uesaka, Z. H. Yang, J. Yasuda, K. Yoneda, J. Zenihiro

      Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics797   134843   2019年10月10日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier  

      © 2019 The Authors We present an investigation of the structure of 13Be obtained via a kinematically complete measurement of the (p,pn) reaction in inverse kinematics at 265 MeV/nucleon. The relative energy spectrum of 13Be is compared to Transfer-to-the-Continuum calculations which use as structure inputs the overlaps of the 14Be ground-state wave function, computed in a three-body model, with the unbound states of the 13Be residual nucleus. The key role of neutron p-wave orbital in the interpretation of the low-relative-energy part of the spectrum is discussed.

      DOI: 10.1016/j.physletb.2019.134843

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    • Isotope production in proton-, deuteron-, and carbon-induced reactions on Nb 93 at 113 MeV/nucleon

      Keita Nakano, Yukinobu Watanabe, Shoichiro Kawase, He Wang, Hideaki Otsu, Hiroyoshi Sakurai, Satoshi Takeuchi, Yasuhiro Togano, Takashi Nakamura, Yukie Maeda, Deuk Soon Ahn, Masayuki Aikawa, Shouhei Araki, Sidong Chen, Nobuyuki Chiga, Pieter Doornenbal, Naoki Fukuda, Takashi Ichihara, Tadaaki Isobe, Shunsuke Kawakami, Tadahiro Kin, Yosuke Kondo, Shunpei Koyama, Toshiyuki Kubo, Shigeru Kubono, Meiko Uesaka, Ayano Makinaga, Masafumi Matsushita, Teiichiro Matsuzaki, Shin'ichiro Michimasa, Satoru Momiyama, Shunsuke Nagamine, Megumi Niikura, Tomoyuki Ozaki, Atsumi Saito, Takeshi Saito, Yoshiaki Shiga, Mizuki Shikata, Yohei Shimizu, Susumu Shimoura, Toshiyuki Sumikama, Pär Anders Söderström, Hiroshi Suzuki, Hiroyuki Takeda, Ryo Taniuchi, Jun'ichi Tsubota, Yasushi Watanabe, Kathrin Wimmer, Tatsuya Yamamoto, Koichi Yoshida

      Physical Review C100 ( 4 )   2019年10月8日

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      掲載種別:研究論文(学術雑誌)  

      © 2019 American Physical Society. Isotope-production cross sections for p-, d-, and C-induced spallation reactions on Nb93 at 113 MeV/nucleon were measured using the inverse-kinematics method employing secondary targets of CH2, CD2, and C. The measured cross sections for Mo90, Nb90, Y86,88 produced by p-induced reactions were found to be consistent with those measured by the conventional activation method. We performed benchmark tests of the reaction models INCL-4.6, JQMD, and JQMD-2.0 implemented in the Particle and Heavy Ion Transport code System (PHITS) and of the nuclear data libraries JENDL-4.0/HE, TENDL-2017, and ENDF/B-VIII.0. The model calculations also showed generally good agreement with the measured isotope-production cross sections for p-, d-, and C-induced reactions. It also turns out that, among the three nuclear data libraries, JENDL-4.0/HE provides the best agreement with the measured data for the p-induced reactions. We compared the present Nb93 data with the Zr93 data, that were measured previously by the same inverse kinematics method (Kawase et al., Prog. Theor. Exp. Phys. 2017, 093D03 (2017)2050-391110.1093/ptep/ptx110), with particular attention to the effect of neutron-shell closure on isotope production in p- and d-induced spallation reactions. The isotopic distributions of the measured production cross sections in the Zr93 data showed noticeable jumps at neutron number N=50 in the isotopic chains of ΔZ=0 and -1, whereas no such jump appeared in isotopic chain of ΔZ=0 in the Nb93 data. From INCL-4.6 + GEM calculations, we found that the jump formed in the evaporation process is smeared out by the intranuclear cascade component in Nb91 produced by the Nb93(p,p2n) and (d,d2n) reactions on Nb93. Moreover, for Nb93, the distribution of the element-production cross sections as a function of the change in proton number ΔZ is shifted to smaller ΔZ than for Zr93, because the excited Nb prefragments generated by the cascade process are more likely to emit protons than the excited Zr prefragments, due to the smaller proton-separation energies of the Nb isotopes.

      DOI: 10.1103/PhysRevC.100.044605

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    • Quasifree Neutron Knockout from 54Ca Corroborates Arising N=34 Neutron Magic Number 査読有り

      S.Chen, J.Lee, P.Doornenbal, A.Obertelli, C.Barbieri, Y.Chazono, P.Navratil, K.Ogata, T.Otsuka, F.Raimondi, V.Soma, Y.Utsuno, K.Yoshida, H.Baba, F.Browne, D.Calvet, F.Chateau, N.Chiga, A.Corsi, M.L.Cortes, A.Delbart, J.-M.Gheller, A.Giganon, A.Gillibert, C.Hilaire, T.Isobe, J.Kahlbow, T.Kobayashi, Y.Kubota, V.Lapoux, H.N.Liu, T.Motobayashi, I.Murray, H.Otsu, V.Panin, N.Paul, W.Rodriguez, H.Sakurai, M.Sasano, D.Steppenbeck, L.Stuhl, Y.L.Sun, Y.Togano, T.Uesaka, K.Wimmer, K.Yoneda, N.Achouri, O.Ak

      Physical Review Letters123   142501   2019年9月30日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Physical Society  

      DOI: 10.1103/PhysRevLett.123.142501

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    • Quasi-free neutron and proton knockout reactions from light nuclei in a wide neutron-to-proton asymmetry range 査読有り

      M.Holl, V.Panin, H.Alvarez-Pol, L.Atar, T.Aumann, S.Beceiro Novo, J.Benlliure, C.A.Bertulani, J.M.Boillos, K.Boretzky, M.Caamano, C.Caesar, E.Casarejos, W.Catford, J.Cederkall, L.Chulkov, D.Cortina-Gil, E.Cravo, I.Dillmann, P.Diaz Fernandez, Z.Elekes, J.Enders, L.M.Fraile, D.Galaviz-Redondo, R.Gernhauser, P.Golubev, T.Heftrich, M.Heil, M.Heine, A.Heinz, A.Henriques, H.T.Johansson, B.Jonson, N.Kalantar-Nayestanaki, R.Kanungo, A.Kelic-Heil, T.Kroll, N.Kurz, C.Langer, T.Le Bleis, S.Lindberg, J.Mach

      Physics Letters B795   682 - 688   2019年8月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier  

      DOI: 10.1016/j.physletb.2019.06.069

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    • How Robust is the N=34 Subshell Closure? First Spectroscopy of 52Ar 査読有り

      H.N.Liu, A.Obertelli, P.Doornenbal, C.A.Bertulani, G.Hagen, J.D.Holt, G.R.Jansen, T.D.Morris, A.Schwenk, R.Stroberg, N.Achouri, H.Baba, F.Browne, D.Calvet, F.Chateau, S.Chen, N.Chiga, A.Corsi, M.L.Cortes, A.Delbart, J.-M.Gheller, A.Giganon, A.Gillibert, C.Hilaire, T.Isobe, T.Kobayashi, Y.Kubota, V.Lapoux, T.Motobayashi, I.Murray, H.Otsu, V.Panin, N.Paul, W.Rodriguez, H.Sakurai, M.Sasano, D.Steppenbeck, L.Stuhl, Y.L.Sun, Y.Togano, T.Uesaka, K.Wimmer, K.Yoneda, O.Aktas, T.Aumann, L.X.Chung, F.Flav

      Physical Review Letters122   072502   2019年2月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Physical Society  

      DOI: 10.1103/PhysRevLett.122.072502

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    • Coulomb breakup reactions of Zr-93,Zr-94 in inverse kinematics

      Satoshi Takeuchi, Takashi Nakamura, Mizuki Shikata, Yasuhiro Togano, Yosuke Kondo, Junichi Tsubota, Tomoyuki Ozaki, Atsumi Saito, Hideaki Otsu, He Wang, Hiroyoshi Sakurai, Yukinobu Watanabe, Shoichiro Kawase, DeukSoon Ahn, Masayuki Aikawa, Takashi Ando, Shohei Araki, Sidong Chen, Nobuyuki Chiga, Pieter Doornenbal, Shuichiro Ebata, Naoki Fukuda, Tadaaki Isobe, Shunsuke Kawakami, Tadahiro Kin, Shunpei Koyama, Shigeru Kubono, Yukie Maeda, Ayano Makinaga, Masafumi Matsushita, Teiichiro Matsuzaki, Shin'ichiro Michimasa, Satoru Momiyama, Shunsuke Nagamine, Keita Nakano, Megumi Niikura, Kazuyuki Ogata, Takeshi Saito, Yoshiaki Shiga, Yohei Shimizu, Susumu Shimoura, Toshiyuki Sumikama, Paer-Anders Soederstrom, Hiroshi Suzuki, Hiroyuki Takeda, Ryo Taniuchi, Meiko Uesaka, Yasushi Watanabe, Kathrin Wimmer, Tatsuya Yamamoto, Koichi Yoshida

      PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS2019 ( 1 )   2019年1月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:OXFORD UNIV PRESS INC  

      Coulomb breakup reactions of Zr have been studied in inverse kinematics at incident beam energies of about 200 MeV/nucleon in order to evaluate neutron capture reaction methods. The Zr(n,)Zr reaction is particularly important as a candidate nuclear transmutation reaction for the long-lived fission product Zr in nuclear power plants. One- and two-neutron removal cross sections on Pb and C targets were measured to deduce the inclusive Coulomb breakup cross sections, 375 29 (stat.) 30 (syst.) and 403 26 (stat.) 31 (syst.) mb for Zr and Zr, respectively. The results are compared with estimates using the standard Lorentzian model and microscopic calculations. The results reveal a possible contribution of the pygmy dipole resonance or giant quadrupole resonance in the Coulomb breakup reactions of Zr.

      DOI: 10.1093/ptep/pty138

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    • Interplay between nuclear shell evolution and shape deformation revealed by the magnetic moment of 75Cu

      Y.Ichikawa, H.Nishibata, Y.Tsunoda, A.Takamine, K.Imamura, T.Fujita, T.Sato, S.Momiyama, Y.Shimizu, D.S.Ahn, K.Asahi, H.Baba, D.L.Balabanski, F.Boulay, J.M.Daugas, T.Egami, N.Fukuda, C.Funayama, T.Furukawa, G.Georgiev, A.Gladkov, N.Inabe, Y.Ishibashi, T.Kawaguchi, T.Kawamura, Y.Kobayashi, S.Kojima, A.Kusoglu, I.Mukul, M.Niikura, T.Nishizaka, A.Odahara, Y.Ohtomo, T.Otsuka, D.Ralet, G.S.Simpson, T.Sumikama, H.Suzuki, H.Takeda, L.C.Tao, Y.Togano, D.Tominaga, H.Ueno, H.Yamazaki, X.F.Yang

      Nature Physics15   321 - 325   2019年1月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)  

      DOI: 10.1038/s41567-018-0410-7

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    • First Observation of B 20 and B 21 査読有り

      S. Leblond, F. M. Marqués, J. Gibelin, N. A. Orr, Y. Kondo, T. Nakamura, J. Bonnard, N. Michel, N. L. Achouri, T. Aumann, H. Baba, F. Delaunay, Q. Deshayes, P. Doornenbal, N. Fukuda, J. W. Hwang, N. Inabe, T. Isobe, D. Kameda, D. Kanno, S. Kim, N. Kobayashi, T. Kobayashi, T. Kubo, J. Lee, R. Minakata, T. Motobayashi, D. Murai, T. Murakami, K. Muto, T. Nakashima, N. Nakatsuka, A. Navin, S. Nishi, S. Ogoshi, H. Otsu, H. Sato, Y. Satou, Y. Shimizu, H. Suzuki, K. Takahashi, H. Takeda, S. Takeuchi, R. Tanaka, Y. Togano, A. G. Tuff, M. Vandebrouck, K. Yoneda

      Physical Review Letters121 ( 26 ) 262502   2018年12月27日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Physical Society  

      © 2018 American Physical Society. The most neutron-rich boron isotopes B20 and B21 have been observed for the first time following proton removal from N22 and C22 at energies around 230 MeV/nucleon. Both nuclei were found to exist as resonances which were detected through their decay into B19 and one or two neutrons. Two-proton removal from N22 populated a prominent resonancelike structure in B20 at around 2.5 MeV above the one-neutron decay threshold, which is interpreted as arising from the closely spaced 1-,2- ground-state doublet predicted by the shell model. In the case of proton removal from C22, the B19 plus one- and two-neutron channels were consistent with the population of a resonance in B21 2.47±0.19 MeV above the two-neutron decay threshold, which is found to exhibit direct two-neutron decay. The ground-state mass excesses determined for B20,21 are found to be in agreement with mass surface extrapolations derived within the latest atomic-mass evaluations.

      DOI: 10.1103/PhysRevLett.121.262502

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    • Low-lying dipole response in the unstable Ni 70 nucleus 査読有り

      O. Wieland, A. Bracco, F. Camera, R. Avigo, H. Baba, N. Nakatsuka, T. Aumann, S. R. Banerjee, G. Benzoni, K. Boretzky, C. Caesar, S. Ceruti, S. Chen, F. C.L. Crespi, V. Derya, P. Doornenbal, N. Fukuda, A. Giaz, K. Ieki, N. Kobayashi, Y. Kondo, S. Koyama, T. Kubo, M. Matsushita, B. Million, T. Motobayashi, T. Nakamura, M. Nishimura, H. Otsu, T. Ozaki, A. T. Saito, H. Sakurai, H. Scheit, F. Schindler, P. Schrock, Y. Shiga, M. Shikata, S. Shimoura, D. Steppenbeck, T. Sumikama, S. Takeuchi, R. Taniuchi, Y. Togano, J. Tscheuschner, J. Tsubota, H. Wang, K. Wimmer, K. Yoneda

      Physical Review C98 ( 6 ) 064313   2018年12月11日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Physical Society  

      © 2018 American Physical Society. The Coulomb excitation of the neutron-rich nucleus Ni70 was measured in inverse kinematics at 260AMeV bombarding energy and with a Au197 target. The beam energy allowed us to study the dipole response around the neutron separation energy (up to about 12 MeV). The experiment was performed at the RIKEN Radioactive Isotope Beam Factory (RIBF). The γ decay from the scattered Ni70 ions at around zero degree was measured with a scintillator detection system composed of large volume LaBr3:Ce detectors (HECTOR+ array) and NaI(Tl) detectors (DALI2 array). Results were obtained for the E1 strength in the region where the dipole response is characterized by the presence of the pygmy dipole resonance. The measured E1 strength is found to be larger as compared with that of Ni68 below the neutron binding energy. The measured E1 strength as a function of energy is compared with available predictions based on relativistic and nonrelativistic approaches, and only in some cases does theory give a reasonable account of the data.

      DOI: 10.1103/PhysRevC.98.064313

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    • Extraction of the Landau-Migdal Parameter from the Gamow-Teller Giant Resonance in Sn 132 査読有り

      J. Yasuda, M. Sasano, R. G.T. Zegers, H. Baba, D. Bazin, W. Chao, M. Dozono, N. Fukuda, N. Inabe, T. Isobe, G. Jhang, D. Kameda, M. Kaneko, K. Kisamori, M. Kobayashi, N. Kobayashi, T. Kobayashi, S. Koyama, Y. Kondo, A. J. Krasznahorkay, T. Kubo, Y. Kubota, M. Kurata-Nishimura, C. S. Lee, J. W. Lee, Y. Matsuda, E. Milman, S. Michimasa, T. Motobayashi, D. Muecher, T. Murakami, T. Nakamura, N. Nakatsuka, S. Ota, H. Otsu, V. Panin, W. Powell, S. Reichert, S. Sakaguchi, H. Sakai, M. Sako, H. Sato, Y. Shimizu, M. Shikata, S. Shimoura, L. Stuhl, T. Sumikama, H. Suzuki, S. Tangwancharoen, M. Takaki, H. Takeda, T. Tako, Y. Togano, H. Tokieda, J. Tsubota, T. Uesaka, T. Wakasa, K. Yako, K. Yoneda, J. Zenihiro

      Physical Review Letters121 ( 13 ) 132501   2018年9月26日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Physical Society  

      © 2018 American Physical Society. The key parameter to discuss the possibility of the pion condensation in nuclear matter, i.e., the so-called Landau-Migdal parameter g′, was extracted by measuring the double-differential cross sections for the (p,n) reaction at 216 MeV/u on a neutron-rich doubly magic unstable nucleus, Sn132 with the quality comparable to data taken with stable nuclei. The extracted strengths for Gamow-Teller (GT) transitions from Sn132 leading to Sb132 exhibit the GT giant resonance (GTR) at the excitation energy of 16.3±0.4(stat)±0.4(syst) MeV with the width of Γ=4.7±0.8 MeV. The integrated GT strength up to Ex=25 MeV is SGT-=53±5(stat)-10+11(syst), corresponding to 56% of Ikeda's sum rule of 3(N-Z)=96. The present result accurately constrains the Landau-Migdal parameter as g′=0.68±0.07, thanks to the high sensitivity of the GTR energy to g′. In combination with previous studies on the GTR for Zr90 and Pb208, the result of this work shows the constancy of this parameter in the nuclear chart region with (N-Z)/A=0.11 to 0.24 and A=90 to 208.

      DOI: 10.1103/PhysRevLett.121.132501

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    • Skyrme random-phase approximation analysis of low-energy dipole states in oxygen isotopes 査読有り

      Tsunenori Inakura, Yasuhiro Togano

      Physical Review C97 ( 5 ) 054330   2018年5月30日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Physical Society  

      Low-energy dipole states in oxygen isotopes are investigated using a Hartree-Fock plus random-phase approximation calculation with Skyrme interactions. We obtain the lowest energy dipole state as isoscalar dominant on the spherical ground states of O16-22, while that in O24 couples to the continuum states. This suggests that the nature of low-energy dipole mode in light nuclei changes at N=16.

      DOI: 10.1103/PhysRevC.97.054330

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    • Proton elastic scattering at 200 A MeV and high momentum transfers of 1.7-2.7 fm -1 as a probe of the nuclear matter density of 6 He 査読有り

      S. Chebotaryov, S. Sakaguchi, T. Uesaka, T. Akieda, Y. Ando, M. Assie, D. Beaumel, N. Chiga, M. Dozono, A. Galindo-Uribarri, B. Heffron, A. Hirayama, T. Isobe, K. Kaki, S. Kawase, W. Kim, T. Kobayashi, H. Kon, Y. Kondo, Y. Kubota, S. Leblond, H. Lee, T. Lokotko, Y. Maeda, Y. Matsuda, K. Miki, E. Milman, T. Motobayashi, T. Mukai, S. Nakai, T. Nakamura, A. Ni, T. Noro, S. Ota, H. Otsu, T. Ozaki, V. Panin, S. Park, A. Saito, H. Sakai, M. Sasano, H. Sato, K. Sekiguchi, Y. Shimizu, I. Stefan, L. Stuhl, M. Takaki, K. Taniue, K. Tateishi, S. Terashima, Y. Togano, T. Tomai, Y. Wada, T. Wakasa, T. Wakui, A. Watanabe, H. Yamada, Zh Yang, M. Yasuda, J. Yasuda, K. Yoneda, J. Zenihiro

      Progress of Theoretical and Experimental Physics2018 ( 5 ) 053D01   2018年5月1日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Physical Society of Japan  

      Differential cross sections of p-6He elastic scattering were measured in inverse kinematics at an incident energy of 200 A MeV, covering the high momentum transfer region of 1.7-2.7 -1. The sensitivity of the elastic scattering at low and high momentum transfers to the density distribution was investigated quantitatively using relativistic impulse approximation calculations. In the high momentum transfer region, where the present data were taken, the differential cross section has an order of magnitude higher sensitivity to the inner part of the 6He density relative to the peripheral part (15:1). This feature makes the obtained data valuable for the deduction of the inner part of the 6He density. The data were compared to a set of calculations assuming different proton and neutron density profiles of 6He. The data are well reproduced by the calculation assuming almost the same profiles of proton and neutron densities around the center of 6He, and a proton profile reproducing the known point-proton radius of 1.94 fm. This finding is consistent with the assumption that the 6He nucleus consists of a rigid α-like core with a two-neutron halo.

      DOI: 10.1093/ptep/pty048

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    • Strong Neutron Pairing in core+4n Nuclei 査読有り

      A. Revel, F. M. Marqués, O. Sorlin, T. Aumann, C. Caesar, M. Holl, V. Panin, M. Vandebrouck, F. Wamers, H. Alvarez-Pol, L. Atar, V. Avdeichikov, S. Beceiro-Novo, D. Bemmerer, J. Benlliure, C. A. Bertulani, J. M. Boillos, K. Boretzky, M. J.G. Borge, M. Caamaño, E. Casarejos, W. N. Catford, J. Cederkäll, M. Chartier, L. Chulkov, D. Cortina-Gil, E. Cravo, R. Crespo, U. Datta Pramanik, P. Díaz Fernández, I. Dillmann, Z. Elekes, J. Enders, O. Ershova, A. Estradé, F. Farinon, L. M. Fraile, M. Freer, D. Galaviz, H. Geissel, R. Gernhäuser, P. Golubev, K. Göbel, J. Hagdahl, T. Heftrich, M. Heil, M. Heine, A. Heinz, A. Henriques, A. Ignatov, H. T. Johansson, B. Jonson, J. Kahlbow, N. Kalantar-Nayestanaki, R. Kanungo, A. Kelic-Heil, A. Knyazev, T. Kröll, N. Kurz, M. Labiche, C. Langer, T. Le Bleis, R. Lemmon, S. Lindberg, J. Machado, J. Marganiec, A. Movsesyan, E. Nacher, M. Najafi, T. Nilsson, C. Nociforo, S. Paschalis, A. Perea, M. Petri, S. Pietri, R. Plag, R. Reifarth, G. Ribeiro, C. Rigollet, M. Röder, D. Rossi, D. Savran, H. Scheit, H. Simon, I. Syndikus, J. T. Taylor, O. Tengblad, R. Thies, Y. Togano, P. Velho, V. Volkov, A. Wagner, H. Weick, C. Wheldon, G. Wilson, J. S. Winfield, P. Woods, D. Yakorev, M. Zhukov, A. Zilges, K. Zuber, R3 B Collaboration

      Physical Review Letters120 ( 15 )   2018年4月12日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Physical Society  

      The emission of neutron pairs from the neutron-rich N=12 isotones C18 and O20 has been studied by high-energy nucleon knockout from N19 and O21 secondary beams, populating unbound states of the two isotones up to 15 MeV above their two-neutron emission thresholds. The analysis of triple fragment-n-n correlations shows that the decay N19(-1p)C18∗→C16+n+n is clearly dominated by direct pair emission. The two-neutron correlation strength, the largest ever observed, suggests the predominance of a C14 core surrounded by four valence neutrons arranged in strongly correlated pairs. On the other hand, a significant competition of a sequential branch is found in the decay O21(-1n)O20∗→O18+n+n, attributed to its formation through the knockout of a deeply bound neutron that breaks the O16 core and reduces the number of pairs.

      DOI: 10.1103/PhysRevLett.120.152504

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    • Unbound states in <sup>17</sup>C probed via single-neutron removal from <sup>18</sup>C at 245 MeV/u 査読有り

      S. Kim, J. W. Hwang, Y. Satou, N. A. Orr, Y. Kondo, T. Nakamura, J. Gibelin, N. L. Achouri, T. Aumann, H. Baba, F. Delaunay, P. Doornenbal, N. Fukuda, N. Inabe, T. Isobe, D. Kameda, D. Kanno, N. Kobayashi, T. Kobayashi, T. Kubo, S. Leblond, J. Lee, F. M. Marqués, R. Minakata, T. Motobayashi, D. Murai, T. Murakami, K. Muto, T. Nakashima, N. Nakatsuka, A. Navin, S. Nishi, S. Ogoshi, H. Otsu, H. Sato, Y. Shimizu, H. Suzuki, K. Takahashi, H. Takeda, S. Takeuchi, R. Tanaka, Y. Togano, A. G. Tuff, M. Vandebrouck, K. Yoneda

      AIP Conference Proceedings1947   2018年4月

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

      © 2018 Author(s). A study of unbound states in 17C by means of one-neutron knockout from a fast moving 18C beam at an energy of 245 MeV/nucleon on a carbon target was performed at the RIKEN-RIBF laboratory utilizing SAMURAI. The energy spectrum of unbound 17C constructed from momentum vectors of the forward going beam velocity 16C fragment and neutron covered an energy range of the decay neutron below about 6 MeV in the center of mass of 17C∗. The relative energy Erel spectrum was characterized by two resonances at about 1.92 and 3.24 MeV in Erel and a possible multiplet at around Erel∼0.7 MeV. Momentum distributions of the knockout residue for the Erel = 1.92 and 3.24-MeV states well matched to those of p-wave neutron removal, providing a model independent confirmation of negative parity assignments for these states. The proposed level scheme of 17C was compared with a range of different shell-model predictions; it turned out that the YSOX shell-model interaction, employing the monopole-based universal interaction for the cross-shell two-body matrix elements and incorporating larger hω excitations, gave a consistent account of it, including the locations of the 1/21- and 3/21- cross-shell states.

      DOI: 10.1063/1.5030810

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    • Quasifree (p, 2p) Reactions on Oxygen Isotopes: Observation of Isospin Independence of the Reduced Single-Particle Strength 査読有り

      L. Atar, S. Paschalis, C. Barbieri, C. A. Bertulani, P. Díaz Fernández, M. Holl, M. A. Najafi, V. Panin, H. Alvarez-Pol, T. Aumann, V. Avdeichikov, S. Beceiro-Novo, D. Bemmerer, J. Benlliure, J. M. Boillos, K. Boretzky, M. J.G. Borge, M. Caamaño, C. Caesar, E. Casarejos, W. Catford, J. Cederkall, M. Chartier, L. Chulkov, D. Cortina-Gil, E. Cravo, R. Crespo, I. Dillmann, Z. Elekes, J. Enders, O. Ershova, A. Estrade, F. Farinon, L. M. Fraile, M. Freer, D. Galaviz Redondo, H. Geissel, R. Gernhäuser, P. Golubev, K. Göbel, J. Hagdahl, T. Heftrich, M. Heil, M. Heine, A. Heinz, A. Henriques, A. Hufnagel, A. Ignatov, H. T. Johansson, B. Jonson, J. Kahlbow, N. Kalantar-Nayestanaki, R. Kanungo, A. Kelic-Heil, A. Knyazev, T. Kröll, N. Kurz, M. Labiche, C. Langer, T. Le Bleis, R. Lemmon, S. Lindberg, J. Machado, J. Marganiec-Gałazka, A. Movsesyan, E. Nacher, E. Y. Nikolskii, T. Nilsson, C. Nociforo, A. Perea, M. Petri, S. Pietri, R. Plag, R. Reifarth, G. Ribeiro, C. Rigollet, D. M. Rossi, M. Röder, D. Savran, H. Scheit, H. Simon, O. Sorlin, I. Syndikus, J. T. Taylor, O. Tengblad, R. Thies, Y. Togano, M. Vandebrouck, P. Velho, V. Volkov, A. Wagner, F. Wamers, H. Weick, C. Wheldon, G. L. Wilson, J. S. Winfield, P. Woods, D. Yakorev, M. Zhukov, A. Zilges, K. Zuber, R3 B Collaboration

      Physical Review Letters120 ( 5 )   2018年1月29日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Physical Society  

      Quasifree one-proton knockout reactions have been employed in inverse kinematics for a systematic study of the structure of stable and exotic oxygen isotopes at the R3B/LAND setup with incident beam energies in the range of 300-450 MeV/u. The oxygen isotopic chain offers a large variation of separation energies that allows for a quantitative understanding of single-particle strength with changing isospin asymmetry. Quasifree knockout reactions provide a complementary approach to intermediate-energy one-nucleon removal reactions. Inclusive cross sections for quasifree knockout reactions of the type OA(p,2p)NA-1 have been determined and compared to calculations based on the eikonal reaction theory. The reduction factors for the single-particle strength with respect to the independent-particle model were obtained and compared to state-of-the-art ab initio predictions. The results do not show any significant dependence on proton-neutron asymmetry.

      DOI: 10.1103/PhysRevLett.120.052501

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    • Effective proton-neutron interaction near the drip line from unbound states in F-25,F-26 査読有り

      M. Vandebrouck, A. Lepailleur, O. Sorlin, T. Aumann, C. Caesar, M. Holl, V. Panin, F. Wamers, S. R. Stroberg, J. D. Holt, F. de Oliveira Santos, H. Alvarez-Pol, L. Atar, V. Avdeichikov, S. Beceiro-Novo, D. Bemmerer, J. Benlliure, C. A. Bertulani, S. K. Bogner, J. M. Boillos, K. Boretzky, M. J. G. Borge, M. Caamano, E. Casarejos, W. Catford, J. Cederkall, M. Chartier, L. Chulkov, D. Cortina-Gil, E. Cravo, R. Crespo, U. Datta Pramanik, P. Diaz Fernandez, I. Dillmann, Z. Elekes, J. Enders, O. Ershova, A. Estrade, F. Farinon, L. M. Fraile, M. Freer, D. Galaviz, H. Geissel, R. Gernhaeuser, J. Gibelin, P. Golubev, K. Goebel, J. Hagdahl, T. Heftrich, M. Heil, M. Heine, A. Heinz, A. Henriques, H. Hergert, A. Hufnagel, A. Ignatov, H. T. Johansson, B. Jonson, J. Kahlbow, N. Kalantar-Nayestanaki, R. Kanungo, A. Kelic-Heil, A. Knyazev, T. Kroll, N. Kurz, M. Labiche, C. Langer, T. Le Bleis, R. Lemmon, S. Lindberg, J. Machado, J. Marganiec, F. M. Marques, A. Movsesyan, E. Nacher, M. Najafi, E. Nikolskii, T. Nilsson, C. Nociforo, S. Paschalis, A. Perea, M. Petri, S. Pietri, R. Plag, R. Reifarth, G. Ribeiro, C. Rigollet, M. Roeder, D. Rossi, D. Savran, H. Scheit, A. Schwenk, H. Simon, I. Syndikus, J. T. Taylor, O. Tengblad, R. Thies, Y. Togano, P. Velho, V. Volkov, A. Wagner, H. Weick, C. Wheldon, G. Wilson, J. S. Winfield, P. Woods, D. Yakorev, M. Zhukov, A. Zilges, K. Zuber

      PHYSICAL REVIEW C96 ( 5 )   2017年11月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      Background: Odd-odd nuclei, around doubly closed shells, have been extensively used to study proton-neutron interactions. However, the evolution of these interactions as a function of the binding energy, ultimately when nuclei become unbound, is poorly known. The F-26 nucleus, composed of a deeply bound pi 0d(5/2) proton and an unbound v0d(3/2) neutron on top of an O-24 core, is particularly adapted for this purpose. The coupling of this proton and neutron results in a J(pi) = 1(1)(+) - 4(1)(+) multiplet, whose energies must be determined to study the influence of the proximity of the continuum on the corresponding proton-neutron interaction. The J(pi) = 1(1)(+), 2(1)(+), 4(1)(+) bound states have been determined, and only a clear identification of the J(pi) = 3(1)(+) is missing.
      Purpose: We wish to complete the study of the J(pi) = 1(1)(+) - 4(1)(+) multiplet in F-26, by studying the energy and width of the J(pi) = 3(1)(+) unbound state. The method was first validated by the study of unbound states in F-25, for which resonances were already observed in a previous experiment.
      Method: Radioactive beams of Ne-26 and Ne-27, produced at about 440AMeV by the fragment separator at the GSI facility were used to populate unbound states in F-25 and F-26 via one-proton knockout reactions on a CH2 target, located at the object focal point of the (RB)-B-3/LAND setup. The detection of emitted. rays and neutrons, added to the reconstruction of the momentum vector of the A - 1 nuclei, allowed the determination of the energy of three unbound states in F-25 and two in F-26.
      Results: Based on its width and decay properties, the first unbound state in F-25, at the relative energy of 49(9) keV, is proposed to be a J(pi) = 1/ 2(-) arising from a p1/2 proton- hole state. In F-26, the first resonance at 323(33) keV is proposed to be the J(pi) = 3(1)(+) member of the J(pi) = 1(1)(+) - 4(1)(+) multiplet. Energies of observed states in F-25,F-26 have been compared to calculations using the independent-particle shell model, a phenomenological shell model, and the ab initio valence-space in-medium similarity renormalization group method.
      Conclusions: The deduced effective proton- neutron interaction is weakened by about 30-40% in comparison to the models, pointing to the need for implementing the role of the continuum in theoretical descriptions or to a wrong determination of the atomic mass of F-26.

      DOI: 10.1103/PhysRevC.96.054305

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    • Cross section measurement of residues produced in proton-and deuteron-induced spallation reactions on 93Zr at 105 MeV/u using the inverse kinematics method 査読有り

      Shoichiro Kawase, Ygbrinobu Watanabe, He Wang, Hideaki Otsu, Hiroyoshi Sakurai, Satoshi Takeuchi, Yasuhiro Togano, Takashi Nakamura, Ygbrie Maeda, Degbr Soon Ahn, Masaygbri Aikawa, Shouhei Araki, Sidong Chen, Nobuygbri Chiga, Pieter Doornenbal, Naoki FGBRuda, Takashi Ichihara, Tadaaki Isobe, Shunsgbre Kawakami, Tadahiro Kin, Yosgbre Kondo, Shunpei Koyama, Toshiygbri Kubo, Shigeru Kubono, Meiko Kurokawa, Ayano Makinaga, Masafumi Matsushita, Teiichiro Matsuzaki, Shin'Ichiro Michimasa, Satoru Momiyama, Shunsgbre Nagamine, Keita Nakano, Megumi Niikura, Tomoygbri Ozaki, Atsumi Saito, Takeshi Saito, Yoshiaki Shiga, Mizgbri Shikata, Yohei Shimizu, Susumu Shimoura, Toshiygbri Sumikama, Pär Anders Söderström, Hiroshi SuzGBRi, Hiroygbri Takeda, Ryo Taniuchi, Jun'Ichi Tsubota, Yasushi Watanabe, Kathrin Wimmer, Tatsuya Yamamoto, Koichi Yoshida

      EPJ Web of Conferences146   2017年9月13日

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      掲載種別:研究論文(国際会議プロシーディングス)  

      © The Authors, published by EDP Sciences, 2017. Isotopic production cross sections in the proton-and deuteron-induced spallation reactions on 93Zr at an energy of 105 MeV/u were measured in inverse kinematics conditions for the development of realistic nuclear transmutation processes for long-lived fission products (LLFPs) with neutron and light-ion beams. The experimental results were compared to the PHITS calculations describing the intra-nuclear cascade and evaporation processes. Although an overall agreement was obtained, a large overestimation of the production cross sections for the removal of a few nucleons was seen. A clear shell effect associated with the neutron magic number N = 50 was observed in the measured isotopic production yields of Zr and Y isotopes, which can be reproduced reasonably by the PHITS calculation.

      DOI: 10.1051/epjconf/201714603012

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    • Cross sections for nuclide production in proton- and deuteron-induced reactions on <sup>93</sup>Nb measured using the inverse kinematics method 査読有り

      Keita Nakano, Yukinobu Watanabe, Shoichiro Kawase, He Wang, Hideaki Otsu, Hiroyoshi Sakurai, Satoshi Takeuchi, Yasuhiro Togano, Takashi Nakamura, Yukie Maeda, Deuk Soon Ahn, Masayuki Aikawa, Shouhei Araki, Sidong Chen, Nobuyuki Chiga, Pieter Doornenbal, Naoki Fukuda, Takashi Ichihara, Tadaaki Isobe, Shunsuke Kawakami, Tadahiro Kin, Yosuke Kondo, Shunpei Koyama, Toshiyuki Kubo, Shigeru Kubono, Meiko Kurokawa, Ayano Makinaga, Masafumi Matsushita, Teiichiro Matsuzaki, Shin'Ichiro Michimasa, Satoru Momiyama, Shunsuke Nagamine, Megumi Niikura, Tomoyuki Ozaki, Atsumi Saito, Takeshi Saito, Yoshiaki Shiga, Mizuki Shikata, Yohei Shimizu, Susumu Shimoura, Toshiyuki Sumikama, Pär Anders Söderström, Hiroshi Suzuki, Hiroyuki Takeda, Ryo Taniuchi, Jun'Ichi Tsubota, Yasushi Watanabe, Kathrin Wimmer, Tatsuya Yamamoto, Koichi Yoshida

      EPJ Web of Conferences146   2017年9月13日

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      掲載種別:研究論文(国際会議プロシーディングス)  

      © The Authors, published by EDP Sciences, 2017. Isotopic production cross sections were measured for proton- and deuteron-induced reactions on 93Nb by means of the inverse kinematics method at RIKEN Radioactive Isotope Beam Factory. The measured production cross sections of residual nuclei in the reaction 93Nb + p at 113 MeV/u were compared with previous data measured by the conventional activation method in the proton energy range between 46 and 249 MeV. The present inverse kinematics data of four reaction products (90Mo, 90Nb, 88Y, and 86Y) were in good agreement with the data of activation measurement. Also, the model calculations with PHITS describing the intra-nuclear cascade and evaporation processes generally well reproduced the measured isotopic production cross sections.

      DOI: 10.1051/epjconf/201714611046

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    • Ground-state configuration of neutron-rich Al-35 via Coulomb breakup 査読有り

      S. Chakraborty, Ushasi Datta, T. Aumann, S. Beceiro-Novo, K. Boretzky, C. Caesar, B. V. Carlson, W. N. Catford, M. Chartier, D. Cortina-Gil, G. De Angelis, P. Diaz Fernandez, H. Emling, O. Ershova, L. M. Fraile, H. Geissel, D. Gonzalez-Diaz, H. Johansson, B. Jonson, N. Kalantar-Nayestanaki, T. Kroell, R. Kruecken, C. Langer, T. Le Bleis, Y. Leifels, J. Marganiec, G. Munzenberg, M. A. Najafi, T. Nilsson, C. Nociforo, V. Panin, R. Plag, A. Rahaman, R. Reifarth, M. V. Ricciardi, C. Rigollet, D. Rossi, C. Scheidenberger, H. Scheit, H. Simon, J. T. Taylor, Y. Togano, S. Typel, Y. Utsuno, A. Wagner, F. Wamers, H. Weick, J. S. Winfield

      PHYSICAL REVIEW C96 ( 3 ) 034301   2017年9月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      The ground-state configuration of Al-35 has been studied via Coulomb dissociation (CD) using the LAND-FRS setup (GSI, Darmstadt) at a relativistic energy of similar to 403 MeV/nucleon. The measured inclusive differential CD cross section for Al-35, integrated up to 5.0 MeV relative energy between the Al-34 core and the neutron using a Pb target, is 78(13) mb. The exclusive measured CD cross section that populates various excited states of 34Al is 29(7) mb. The differential CD cross section of Al-35 -&gt; Al-34 + n has been interpreted in the light of a direct breakup model, and it suggests that the possible ground-state spin and parity of Al-35 could be, tentatively, 1/2+ or 3/2(+) or 5/2(+). The valence neutrons, in the ground state of Al-35, may occupy a combination of either l = 3,0 or l = 1,2 orbitals coupled with the Al-34 core in the ground and isomeric state(s), respectively. This hints of a particle-hole configuration of the neutron across the magic shell gaps at N = 20,28 which suggests narrowing the magic shell gap. If the 5/2+ is the ground-state spin-parity of Al-35 as suggested in the literature, then the major ground-state configuration of Al-35 is a combination of Al-34(g. s.; 4(-)) circle times upsilon(p3/2) and Al-34(isomer; 1(+)) circle times upsilon(d3/2) states. The result from this experiment has been compared with that from a previous knockout measurement and a calculation using the SDPF-M interaction.

      DOI: 10.1103/PhysRevC.96.034301

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    • Study of proton- and deuteron-induced spallation reactions on the long-lived fission product Zr-93 at 105 MeV/nucleon in inverse kinematics 査読有り

      Shoichiro Kawase, Keita Nakano, Yukinobu Watanabe, He Wang, Hideaki Otsu, Hiroyoshi Sakurai, Deuk Soon Ahn, Masayuki Aikawa, Takashi Ando, Shouhei Araki, Sidong Chen, Nobuyuki Chiga, Pieter Doornenbal, Naoki Fukuda, Tadaaki Isobe, Shunsuke Kawakami, Tadahiro Kin, Yosuke Kondo, Shunpei Koyama, Shigeru Kubono, Yukie Maeda, Ayano Makinaga, Masafumi Matsushita, Teiichiro Matsuzaki, Shin'ichiro Michimasa, Satoru Momiyama, Shunsuke Nagamine, Takashi Nakamura, Megumi Niikura, Tomoyuki Ozaki, Atsumi Saito, Takeshi Saito, Yoshiaki Shiga, Mizuki Shikata, Yohei Shimizu, Susumu Shimoura, Toshiyuki Sumikama, Par-Anders Soderstrom, Hiroshi Suzuki, Hiroyuki Takeda, Satoshi Takeuchi, Ryo Taniuchi, Yasuhiro Togano, Jun'ichi Tsubota, Meiko Uesaka, Yasushi Watanabe, Kathrin Wimmer, Tatsuya Yamamoto, Koichi Yoshida

      PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS2017 ( 9 ) 093D03   2017年9月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:OXFORD UNIV PRESS INC  

      Spallation reactions for the long-lived fission product Zr-93 have been studied in order to provide basic data necessary for nuclear waste transmutation. Isotopic-production cross sections via proton-and deuteron-induced spallation reactions on Zr-93 at 105 MeV/nucleon were measured in inverse kinematics at the RIKEN Radioactive Isotope Beam Factory. Remarkable jumps in isotopic production originating from the neutron magic number N = 50 were observed in Zr and Y isotopes. The experimental results were compared to the PHITS calculations considering both the intranuclear cascade and evaporation processes, and the calculations greatly overestimated the measured production yield, corresponding to few-nucleon-removal reactions. The present data suggest that the spallation reaction is a potential candidate for the treatment of Zr-93 in spent nuclear fuel.

      DOI: 10.1093/ptep/ptx110

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    • In-beam γ-ray spectroscopy of 35Mg via knockout reactions at intermediate energies 査読有り

      S. Momiyama, P. Doornenbal, H. Scheit, S. Takeuchi, M. Niikura, N. Aoi, K. Li, M. Matsushita, D. Steppenbeck, H. Wang, H. Baba, E. Ideguchi, M. Kimura, N. Kobayashi, Y. Kondo, J. Lee, S. Michimasa, T. Motobayashi, N. Shimizu, M. Takechi, Y. Togano, Y. Utsuno, K. Yoneda, H. Sakurai

      Physical Review C96 ( 3 ) 034328   2017年9月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Physical Society  

      DOI: 10.1103/PhysRevC.96.034328

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    • Single-neutron knockout from C-20 and the structure of C-19 査読有り

      J. W. Hwang, S. Kim, Y. Satou, N. A. Orr, Y. Kondo, T. Nakamura, J. Gibelin, N. L. Achouri, T. Aumann, H. Baba, F. Delaunay, P. Doornenbal, N. Fukuda, N. Inabe, T. Isobe, D. Kameda, D. Kanno, N. Kobayashi, T. Kobayashi, T. Kubo, S. Leblond, J. Lee, F. M. Marques, R. Minakata, T. Motobayashi, D. Murai, T. Murakami, K. Muto, T. Nakashima, N. Nakatsuka, A. Navin, S. Nishi, S. Ogoshi, H. Otsu, H. Sato, Y. Shimizu, H. Suzuki, K. Takahashi, H. Takeda, S. Takeuchi, R. Tanaka, Y. Togano, A. G. Tuff, M. Vandebrouck, K. Yoneda

      PHYSICS LETTERS B769   503 - 508   2017年6月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

      The low-lying unbound level structure of the halo nucleus C-19 has been investigated using single-neutron knockout from C-20 on a carbon target at 280 MeV/nucleon. The invariant mass spectrum, derived from the momenta of the forward going beam velocity C-18 fragment and neutrons, was found to be dominated by a very narrow near threshold (E-rel = 0.036(1) MeV) peak. Two less strongly populated resonance like features were also observed at E-rel = 0.84(4) and 2.31(3) MeV, both of which exhibit characteristics consistent with neutron p-shell hole states. Comparisons of the energies, measured cross sections and parallel momentum distributions to the results of shell-model and eikonal reaction calculations lead to spin-parity assignments of 5/2(1)(+) and 1/2(1)(-) for the levels at E-x = 0.62(9) and 2.89(10) MeV with S-n = 0.58(9) MeV. Spectroscopic factors were also deduced and found to be in reasonable accord with shell-model calculations. The valence neutron configuration of the C-20 ground state is thus seen to include, in addition to the known 1s(1/2)(2) component, a significant 0d(5/2)(2) contribution. The level scheme of C-19, including significantly the 1/2(1)(-) cross-shell state, is well accounted for by the YSOX shell-model interaction developed from the monopole-based universal interaction. (C) 2017 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license.

      DOI: 10.1016/j.physletb.2017.04.019

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    • Observation of isoscalar and isovector dipole excitations in neutron-rich O-20 査読有り

      N. Nakatsuka, H. Baba, T. Aumann, R. Avigo, S. R. Banerjee, A. Bracco, C. Caesar, F. Camera, S. Ceruti, S. Chen, V. Derya, P. Doornenbal, A. Giaz, A. Horvat, K. Ieki, T. Inakura, N. Imai, T. Kawabata, N. Kobayashi, Y. Kondo, S. Koyama, M. Kurata-Nishimura, S. Masuoka, M. Matsushita, S. Michimasa, B. Million, T. Motobayashi, T. Murakami, T. Nakamura, T. Ohnishi, H. J. Ong, S. Ota, H. Otsu, T. Ozaki, A. Saito, H. Sakurai, H. Scheit, F. Schindler, P. Schrock, Y. Shiga, M. Shikata, S. Shimoura, D. Steppenbeck, T. Sumikama, I. Syndikus, H. Takeda, S. Takeuchi, A. Tamii, R. Taniuchi, Y. Togano, J. Tscheuschner, J. Tsubota, H. Wang, O. Wieland, K. Wimmer, Y. Yamaguchi, K. Yoneda, J. Zenihiro

      PHYSICS LETTERS B768   387 - 392   2017年5月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

      The isospin characters of low-energy dipole excitations in neutron-rich unstable nucleus O-20 were investigated, for the first time in unstable nuclei. Two spectra obtained from a dominant isovector probe (O-20 + Au) and a dominant isoscalar probe (O-20 + alpha) were compared and analyzed by the distorted-wave Born approximation to extract independently the isovector and isoscalar dipole strengths. Two known 1(-) states with large isovector dipole strengths at energies of 5.36(5) MeV (1(1)(-)) and 6.84(7) MeV (1(2)(-)) were also excited by the isoscalar probe. These two states were found to have different isoscalar dipole strengths, 2.70(32)%(1(1)(-)) and 0.67(12)%(1(2)(-)), respectively, in exhaustion of the isoscalar dipole-energy-weighted sum rule. The difference in isoscalar strength indicated that they have different underlying structures. (C) 2017 The Author(s). Published by Elsevier B.V.

      DOI: 10.1016/j.physletb.2017.03.017

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    • Coulomb breakup of neutron-rich Na-29,Na-30 isotopes near the island of inversion 査読有り

      A. Rahaman, Ushasi Datta, T. Aumann, S. Beceiro-Novo, K. Boretzky, C. Caesar, B. V. Carlson, W. N. Catford, S. Chakraborty, M. Chartier, D. Cortina-Gil, G. De Angelis, P. Diaz Fernandez, H. Emling, O. Ershova, L. M. Fraile, H. Geissel, D. Gonzalez-Diaz, H. Johansson, B. Jonson, N. Kalantar-Nayestanaki, T. Kroell, R. Kruecken, J. Kurcewicz, C. Langer, T. Le Bleis, Y. Leifels, J. Marganiec, G. Muenzenberg, M. A. Najafi, T. Nilsson, C. Nociforo, V. Panin, S. Paschalis, R. Plag, R. Reifarth, M. V. Ricciardi, C. Rigollet, D. Rossi, C. Scheidenberger, H. Scheit, H. Simon, J. T. Taylor, Y. Togano, S. Typel, V. Volkov, A. Wagner, F. Wamers, H. Weick, M. Weigand, J. S. Winfield, D. Yakorev, M. Zoric

      JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS44 ( 4 ) 045101   2017年4月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

      First results are reported on the ground state configurations of the neutron-rich Na-29,Na-30 isotopes, obtained via Coulomb dissociation (CD) measurements. The invariant mass spectra of these nuclei have been obtained through measurement of the four-momenta of all decay products after Coulomb excitation of those nuclei on a Pb-208 target at energies of 400-430 MeV/nucleon using the FRS-ALADIN-LAND setup at GSI, Darmstadt. Integrated inclusive CD cross-sections (CD) of 89 (7) mb and 167 (13) mb for one neutron removal from Na-29 and Na-30, respectively, have been extracted up to an excitation energy of 10 MeV. The major part of one neutron removal, CD cross-sections of those nuclei populate the core, in its ground state. A comparison with the direct breakup model, suggests the predominant occupation of the valence neutron in the ground state of Na-29 (3/2(+)) and Na-30 (2(+)) is the d-orbital with a small contribution from the s-orbital, which are coupled with the ground state of the core. One of the major components of the ground state configurations of these nuclei are Na-28(gs)(1(+)) circle times v(s,d) and Na-29(gs)(3/2(+)) circle times v(s,d), respectively. The ground state spin and parity of these nuclei obtained from this experiment are in agreement with earlier reported values. The spectroscopic factors for the valence neutron occupying the s and d orbitals for these nuclei in the ground state have been extracted and reported for the first time. A comparison of the experimental findings with shell model calculation using the MCSM suggests a lower limit of around 4.3 MeV of the sd-pf shell gap in Na-30.

      DOI: 10.1088/1361-6471/aa594d

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    • Intruder configurations in the ground state of Ne-30 査読有り

      H. N. Liu, J. Lee, R. Doornenbal, H. Scheit, S. Takeuchi, N. Aoi, K. A. Li, M. Matsushita, D. Steppenbeck, H. Wang, H. Baba, E. Ideguchi, N. Kobayashi, Y. Kondo, G. Lee, S. Michimasa, T. Motobayashi, A. Poves, H. Sakurai, M. Takechi, Y. Togano, J. A. Tostevin, Y. Utsuno

      PHYSICS LETTERS B767   58 - 62   2017年4月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

      We report on the first detailed study of intruder configurations in the ground state of Ne-30 by means of the C-12(Ne-30, Ne-29+gamma) X one-neutron knockout reaction at 228MeV/nucleon. Using a combined analysis of individual parallel momentum distributions and partial cross sections we find: (a) comparable pand d-wave removal strength to Ne-29 final states with excitation energies below 200keV, and (b) significant p-wave removal strength to the 620keV state of Ne-29, and (c) no evidence for f-wave intruder strength leading to bound Ne-29 final states. The SDPF-U-MIX shell model calculation in the sd-pfmodel space provides a better overall agreement with the measured energy levels of Ne-29 and the fp-intruder amplitudes in Ne-30 than the SDPF-M prediction, suggesting that the refinement of the sd-pfcross shell interaction and extension of the model space to include the 2p(1/2) and 1f(5/2) levels are important for understanding the island of inversion. (C) 2017 The Authors. Published by Elsevier B. V. This is an open access article under the CC BY license.

      DOI: 10.1016/j.physletb.2017.01.052

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    • Low-Z shore of the "island of inversion" and the reduced neutron magicity toward O-28 査読有り

      P. Doornenbal, H. Scheit, S. Takeuchi, Y. Utsuno, N. Aoi, K. Li, M. Matsushita, D. Steppenbeck, H. Wang, H. Baba, E. Ideguchi, N. Kobayashi, Y. Kondo, J. Lee, S. Michimasa, T. Motobayashi, T. Otsuka, H. Sakurai, M. Takechi, Y. Togano, K. Yoneda

      PHYSICAL REVIEW C95 ( 4 ) 041301   2017年4月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      The two odd-even fluorine isotopes F-27,F-29 were studied via in-beam gamma-ray spectroscopy at the RIKEN Radioactive Isotope Beam Factory. A secondary beam of Ne-30 was used to induce one-proton and one-protontwo- neutron removal reactions on carbon and polyethylene targets at midtarget energies of 228 MeV/u. Excited states were observed at 915(12) keV for F-27 and at 1080(18) keV for F-29. Both were assigned a 1/2(1)(+) spin and parity. The low transition energy for F-29 largely disagrees with shell model predictions restricted to the sd model space. Calculations using effective interactions that include the neutron pf shell indicate that the N = 20 gap is quenched for F-29, thus extending the "island of inversion" to isotopes with proton number Z = 9. Variations of the N = 20 gap further reveal a strong correlation to the 1/2(1)(+) level energy in F-29 and suggest a persistent reduced neutron gap for O-28.

      DOI: 10.1103/PhysRevC.95.041301

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    • Spectroscopy of Fe-61 via the neutron transfer reaction H-2(Fe-60, p)Fe-61 査読有り

      S. Giron, F. Hammache, N. de Sereville, P. Roussel, J. Burgunder, M. Moukaddam, D. Beaumel, L. Caceres, G. Duchene, E. Clement, B. Fernandez-Dominguez, F. Flavigny, G. de France, S. Franchoo, D. Galaviz-Redondo, L. Gasques, J. Gibelin, A. Gillibert, S. Grevy, J. Guillot, M. Heil, J. Kiener, V. Lapoux, F. Marechal, A. Matta, I. Matea, L. Nalpas, J. Pancin, L. Perrot, A. Obertelli, R. Raabe, J. A. Scarpaci, K. Sieja, O. Sorlin, I. Stefan, C. Stodel, M. Takechi, J. C. Thomas, Y. Togano

      PHYSICAL REVIEW C95 ( 3 ) 035806   2017年3月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      The direct component of the Fe-60(n,gamma) Fe-61 cross section was investigated by populating the bound states of the Fe-61 nucleus through the (d, p gamma) transfer reaction in inverse kinematics using a radioactive beam of Fe-60 at 27A MeV. The experiment was performed at GANIL using the MUST2 array and an annular double-sided silicon strip detector for the detection of the light charged particle in coincidence with the photons measured in the EXOGAM gamma-ray detectors. For the first time, the spectroscopic factors of the first 3/2(-), 5/2(-), 1/2(-), and 9/2(+) states of Fe-61 were deduced experimentally from an adiabatic distorted wave approximation analysis of the data. The obtained results show a very good agreement with the shell-model predictions. The calculated direct component of the (n,gamma) cross section was found negligible and of about 2% of the total, indicating a dominant resonant component.

      DOI: 10.1103/PhysRevC.95.035806

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    • Determination of the neutron-capture rate of C-17 for r-process nucleosynthesis 査読有り

      M. Heine, S. Typel, M. -R. Wu, T. Adachi, Y. Aksyutina, J. Alcantara, S. Altstadt, H. Alvarez-Pol, N. Ashwood, L. Atar, T. Aumann, V. Avdeichikov, M. Barr, S. Beceiro-Novo, D. Bemmerer, J. Benlliure, C. A. Bertulani, K. Boretzky, M. J. G. Borge, G. Burgunder, M. Caamano, C. Caesar, E. Casarejos, W. Catford, J. Cederkaell, S. Chakraborty, M. Chartier, L. V. Chulkov, D. Cortina-Gil, R. Crespo, U. Datta Pramanik, P. Diaz Fernandez, I. Dillmann, Z. Elekes, J. Enders, O. Ershova, A. Estrade, F. Farinon, L. M. Fraile, M. Freer, M. Freudenberger, H. O. U. Fynbo, D. Galaviz, H. Geissel, R. Gernhaeuser, K. Goebel, P. Golubev, D. Gonzalez Diaz, J. Hagdahl, T. Heftrich, M. Heil, A. Heinz, A. Henriques, M. Holl, G. Ickert, A. Ignatov, B. Jakobsson, H. T. Johansson, B. Jonson, N. Kalantar-Nayestanaki, R. Kanungo, A. Kelic-Heil, R. Knoebel, T. Kroell, R. Kruecken, J. Kurcewicz, N. Kurz, M. Labiche, C. Langer, T. Le Bleis, R. Lemmon, O. Lepyoshkina, S. Lindberg, J. Machado, J. Marganiec, G. Martinez-Pinedo, V. Maroussov, M. Mostazo, A. Movsesyan, A. Najafi, T. Neff, T. Nilsson, C. Nociforo, V. Panin, S. Paschalis, A. Perea, M. Petri, S. Pietri, R. Plag, A. Prochazka, A. Rahaman, G. Rastrepina, R. Reifarth, G. Ribeiro, M. V. Ricciardi, C. Rigollet, K. Riisager, M. Roeder, D. Rossi, J. Sanchez del Rio, D. Savran, H. Scheit, H. Simon, O. Sorlin, V. Stoica, B. Streicher, J. T. Taylor, O. Tengblad, S. Terashima, R. Thies, Y. Togano, E. Uberseder, J. Van de Walle, P. Velho, V. Volkov, A. Wagner, F. Wamers, H. Weick, M. Weigand, C. Wheldon, G. Wilson, C. Wimmer, J. S. Winfield, P. Woods, D. Yakorev, M. V. Zhukov, A. Zilges, K. Zuber

      PHYSICAL REVIEW C95 ( 1 )   2017年1月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      With the (RB)-B-3-LAND setup at GSI we have measured exclusive relative-energy spectra of the Coulomb dissociation of C-18 at a projectile energy around 425A MeV on a lead target, which are needed to determine the radiative neutron-capture cross sections of C-17 into the ground state of C-18. Those data have been used to constrain theoretical calculations for transitions populating excited states in C-18. This allowed to derive the astrophysical cross section sigma(n gamma)*. accounting for the thermal population of C-17 target states in astrophysical scenarios. The experimentally verified capture rate is significantly lower than those of previously obtained Hauser-Feshbach estimations at temperatures T-9 &lt;= 1 GK. Network simulations with updated neutron-capture rates and hydrodynamics according to the neutrino-driven wind model as well as the neutron-star merger scenario reveal no pronounced influence of neutron capture of C-17 on the production of second-and third-peak elements in contrast to earlier sensitivity studies.

      DOI: 10.1103/PhysRevC.95.014613

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    • Corrigendum to “Single-neutron knockout from <sup>20</sup> C and the structure of <sup>19</sup> C” [Phys. Lett. B 769 (2017) 503–508] (S0370269317302939) (10.1016/j.physletb.2017.04.019))

      J. W. Hwang, S. Kim, Y. Satou, N. A. Orr, Y. Kondo, T. Nakamura, J. Gibelin, N. L. Achouri, T. Aumann, H. Baba, F. Delaunay, P. Doornenbal, N. Fukuda, N. Inabe, T. Isobe, D. Kameda, D. Kanno, N. Kobayashi, T. Kobayashi, T. Kubo, S. Leblond, J. Lee, F. M. Marqués, R. Minakata, T. Motobayashi, D. Murai, T. Murakami, K. Muto, T. Nakashima, N. Nakatsuka, A. Navin, S. Nishi, S. Ogoshi, H. Otsu, H. Sato, Y. Shimizu, H. Suzuki, K. Takahashi, H. Takeda, S. Takeuchi, R. Tanaka, Y. Togano, A. G. Tuff, M. Vandebrouck, K. Yoneda

      Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics   1   2017年

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      掲載種別:研究論文(学術雑誌)  

      © 2017 The units of the ordinate axis of Fig. 2 on page 506 were given incorrectly as [mb/(GeV/c)]. They should be [mb/(MeV/c)]. This change does not affect any of the results in Table 1, including the cross sections, nor the subsequent discussion.

      DOI: 10.1016/j.physletb.2017.08.072

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    • Cross section measurement of residues produced in proton- and deuteron-induced spallation reactions on Zr-93 at 105 MeV/u using the inverse kinematics method 査読有り

      Kawase Shoichiro, Watanabe Yukinobu, Wang He, Otsu Hideaki, Sakurai Hiroyoshi, Takeuchi Satoshi, Togano Yasuhiro, Nakamura Takashi, Maeda Yukie, Ahn Deuk Soon, Aikawa Masayuki, Araki Shouhei, Chen Sidong, Chiga Nobuyuki, Doornenbal Pieter, Fukuda Naoki, Ichihara Takashi, Isobe Tadaaki, Kawakami Shunsuke, Kin Tadahiro, Kondo Yosuke, Koyama Shunpei, Kubo Toshiyuki, Kubono Shigeru, Kurokawa Meiko, Makinaga Ayano, Matsushita Masafumi, Matsuzaki Teiichiro, Michimasa Shin'ichiro, Momiyama Satoru, Nagamine Shunsuke, Nakano Keita, Niikura Megumi, Ozaki Tomoyuki, Saito Atsumi, Saito Takeshi, Shiga Yoshiaki, Shikata Mizuki, Shimizu Yohei, Shimoura Susumu, Sumikama Toshiyuki, Soederstroem Paer-Anders, Suzuki Hiroshi, Takeda Hiroyuki, Taniuchi Ryo, Tsubota Jun'ichi, Watanabe Yasushi, Wimmer Kathrin, Yamamoto Tatsuya, Yoshida Koichi

      ND 2016: INTERNATIONAL CONFERENCE ON NUCLEAR DATA FOR SCIENCE AND TECHNOLOGY146   2017年

    • Cross sections for nuclide production in proton- and deuteron-induced reactions on Nb-93 measured using the inverse kinematics method 査読有り

      Nakano Keita, Watanabe Yukinobu, Kawase Shoichiro, Wang He, Otsu Hideaki, Sakurai Hiroyoshi, Takeuchi Satoshi, Togano Yasuhiro, Nakamura Takashi, Maeda Yukie, Ahn Deuk Soon, Aikawa Masayuki, Araki Shouhei, Chen Sidong, Chiga Nobuyuki, Doornenbal Pieter, Fukuda Naoki, Ichihara Takashi, Isobe Tadaaki, Kawakami Shunsuke, Kin Tadahiro, Kondo Yosuke, Koyama Shunpei, Kubo Toshiyuki, Kubono Shigeru, Kurokawa Meiko, Makinaga Ayano, Matsushita Masafumi, Matsuzaki Teiichiro, Michimasa Shin'ichiro, Momiyama Satoru, Nagamine Shunsuke, Niikura Megumi, Ozaki Tomoyuki, Saito Atsumi, Saito Takeshi, Shiga Yoshiaki, Shikata Mizuki, Shimizu Yohei, Shimoura Susumu, Sumikama Toshiyuki, Soderstrom Par-Anders, Suzuki Hiroshi, Takeda Hiroyuki, Taniuchi Ryo, Tsubota Jun'ichi, Watanabe Yasushi, Wimmer Kathrin, Yamamoto Tatsuya, Yoshida Koichi

      ND 2016: INTERNATIONAL CONFERENCE ON NUCLEAR DATA FOR SCIENCE AND TECHNOLOGY146   2017年

    • Electric dipole responses of 50Ca and 52Ca

      Y. Togano

      RIKEN Accelerator Progress Report51   34   2017年

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      記述言語:英語  

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    • Interaction cross section study of the two-neutron halo nucleus C-22 査読有り

      Y. Togano, T. Nakamura, Y. Kondo, J. A. Tostevin, A. T. Saito, J. Gibelin, N. A. Orr, N. L. Achouri, T. Aumann, H. Baba, F. Delaunay, R. Doornenbal, N. Fukuda, J. W. Hwang, N. Inabe, T. Isobe, D. Kameda, D. Kanno, S. Kim, N. Kobayashi, T. Kobayashi, T. Kubo, S. Leblond, J. Lee, F. M. Marques, R. Minakata, T. Motobayashi, D. Murai, T. Murakami, K. Muto, T. Nakashima, N. Nakatsuka, A. Navin, S. Nishi, S. Ogoshi, H. Otsu, H. Sato, Y. Satou, Y. Shimizu, H. Suzuki, K. Takahashi, H. Takeda, S. Takeuchi, R. Tanaka, A. G. Tuff', M. Vandebrouck, K. Yoneda

      PHYSICS LETTERS B761   412 - 418   2016年10月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

      The interaction cross sections (sigma(I)) of the very neutron-rich carbon isotopes C-19, C-20 and C-22 have been measured on a carbon target at 307, 280, and 235 MeV/nucleon, respectively. A sigma(I) of 1.280 +/- 0.023 b was obtained for C-22, significantly larger than for 19,20C, supporting the halo character of C-22. A C-22 root-mean-squared matter radius of 3.44 +/- 0.08 fm was deduced using a four-body Glauber reaction model. This value is smaller than an earlier estimate (of 5.4 +/- 0.9 fm) derived from a sigma(I) measurement on a hydrogen target at 40 MeV/nucleon. These new, higher-precision sigma(I) data provide stronger constraints for assessing the consistency of theories describing weakly bound nuclei. (C) 2016 The Authors. Published by Elsevier B.V.

      DOI: 10.1016/j.physletb.2016.08.062

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    • Proton-proton correlations in distinguishing the two-proton emission mechanism of Al-23 and Mg-22 査読有り

      D. Q. Fang, Y. G. Ma, X. Y. Sun, P. Zhou, Y. Togano, N. Aoi, H. Baba, X. Z. Cai, X. G. Cao, J. G. Chen, Y. Fu, W. Guo, Y. Hara, T. Honda, Z. G. Hu, K. Ieki, Y. Ishibashi, Y. Ito, N. Iwasa, S. Kanno, T. Kawabata, H. Kimura, Y. Kondo, K. Kurita, M. Kurokawa, T. Moriguchi, H. Murakami, H. Ooishi, K. Okada, S. Ota, A. Ozawa, H. Sakurai, S. Shimoura, R. Shioda, E. Takeshita, S. Takeuchi, W. D. Tian, H. W. Wang, J. S. Wang, M. Wang, K. Yamada, Y. Yamada, Y. Yasuda, K. Yoneda, G. Q. Zhang, T. Motobayashi

      PHYSICAL REVIEW C94 ( 4 ) 044621   2016年10月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      The proton-proton momentum correlation functions [C-pp(q)] for the kinematically complete decay channels Al-23 -&gt; p + p + Na-21 and Mg-22 -&gt; p + p + Ne-20 have been measured at the RIKEN RI Beam Factory. From the very different correlation strength of C-pp(q) for Al-23 and Mg-22, the source size and emission time information were extracted from the C-pp(q) data by assuming a Gaussian source profile in the correlation function calculation code (CRAB). The results indicated that the mechanism of two-proton emission from Al-23 was mainly sequential emission, while that of Mg-22 was mainly three-body simultaneous emission. By combining our earlier results of the two-proton relative momentum and the opening angle, it is pointed out that the mechanism of two-proton emission could be distinguished clearly.

      DOI: 10.1103/PhysRevC.94.044621

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    • Direct experimental evidence for a multiparticle-hole ground state configuration of deformed Mg-33 査読有り

      Ushasi Datta, A. Rahaman, T. Aumann, S. Beceiro-Novo, K. Boretzky, C. Caesar, B. V. Carlson, W. N. Catford, S. Chakraborty, M. Chartier, D. Cortina-Gil, G. de Angelis, P. Diaz Fernandez, H. Emling, O. Ershova, L. M. Fraile, H. Geissel, D. Gonzalez-Diaz, B. Jonson, H. Johansson, N. Kalantar-Nayestanaki, T. Kroell, R. Kruecken, J. Kurcewicz, C. Langer, T. Le Bleis, Y. Leifels, J. Marganiec, G. Muenzenberg, M. A. Najafi, T. Nilsson, C. Nociforo, V. Panin, S. Paschalis, R. Plag, R. Reifarth, V. Ricciardi, D. Rossi, H. Scheit, C. Scheidenberger, H. Simon, J. T. Taylor, Y. Togano, S. Typel, V. Volkov, A. Wagner, F. Wamers, H. Weick, M. Weigand, J. S. Winfield, D. Yakorev, M. Zoric

      PHYSICAL REVIEW C94 ( 3 ) 034304   2016年9月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      The first direct experimental evidence of a multiparticle-hole ground state configuration of the neutron-rich Mg-33 isotope has been obtained via intermediate energy (400 A MeV) Coulomb dissociation measurement. The major part similar to(70 +/- 13)% of the cross section is observed to populate the excited states of Mg-32 after the Coulomb breakup of Mg-33. The shapes of the differential Coulomb dissociation cross sections in coincidence with different core excited states favor that the valence neutron occupies both the s(1/2) and p(3/2) orbitals. These experimental findings suggest a significant reduction and merging of sd-pf shell gaps at N similar to 20 and 28. The ground state configuration of Mg-33 is predominantly a combination of Mg-32(3.0,3.5MeV; 2(-), 1(-)) circle times nu(s1/2), Mg-32(2.5MeV; 2(+)) circle times nu(p3/2), and Mg-32(0; 0(+)) circle times nu(p3/2). The experimentally obtained quantitative spectroscopic information for the valence neutron occupation of the s and p orbitals, coupled with different core states, is in agreement with Monte Carlo shell model (MCSM) calculation using 3 MeV as the shell gap at N = 20.

      DOI: 10.1103/PhysRevC.94.034304

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    • Asymmetry dependence of reduction factors from single-nucleon knockout of Ne-30 at similar to 230 MeV/nucleon 査読有り

      J. Lee, H. Liu, P. Doornenbal, M. Kimura, K. Minomo, K. Ogata, Y. Utsuno, N. Aoi, K. Li, M. Matsushita, H. Scheit, D. Steppenbeck, S. Takeuchi, H. Wang, H. Baba, E. Ideguchi, N. Kobayashi, Y. Kondo, S. Michimasa, T. Motobayashi, H. Sakurai, M. Takechi, Y. Togano

      PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS2016 ( 8 ) 083D01   2016年8月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:OXFORD UNIV PRESS INC  

      The single-neutron and -proton removal reactions of Ne-30 with large separation-energy asymmetry vertical bar Delta S vertical bar = vertical bar S-n - S-p vertical bar at incident energies of about 230 MeV/nucleon are measured. In the case of the deeply bound nucleon removal data, a large disagreement is obtained from the theoretical cross sections calculated using the eikonal reaction theory, with nuclear structure inputs from the many-body shell-model theory and the antisymmetrized molecular dynamics theory, respectively. Such a discrepancy is consistent with the systematics observed from the knockout reactions at incident energies similar to 100 MeV/nucleon.

      DOI: 10.1093/ptep/ptw096

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    • Coulomb dissociation of N-20,N-21 査読有り

      Marko Roeder, Tatsuya Adachi, Yulia Aksyutina, Juan Alcantara, Sebastian Altstadt, Hector Alvarez-Pol, Nicholas Ashwood, Leyla Atar, Thomas Aumann, Vladimir Avdeichikov, M. Barr, Saul Beceiro, Daniel Bemmerer, Jose Benlliure, Carlos Bertulani, Konstanze Boretzky, Maria J. G. Borge, G. Burgunder, Manuel Caamano, Christoph Caesar, Enrique Casarejos, Wilton Catford, Joakim Cederkall, S. Chakraborty, Marielle Chartier, Leonid Chulkov, Dolores Cortina-Gil, Raquel Crespo, Ushasi Datta Pramanik, Paloma Diaz-Fernandez, Iris Dillmann, Zoltan Elekes, Joachim Enders, Olga Ershova, A. Estrade, F. Farinon, Luis M. Fraile, Martin Freer, M. Freudenberger, Hans Fynbo, Daniel Galaviz, Hans Geissel, Roman Gernhaeuser, Kathrin Goebel, Pavel Golubev, D. Gonzalez Diaz, Julius Hagdahl, Tanja Heftrich, Michael Heil, Marcel Heine, Andreas Heinz, Ana Henriques, Matthias Holl, G. Ickert, Alexander Ignatov, Bo Jakobsson, Hakan Johansson, Bjorn Jonson, Nasser Kalantar-Nayestanaki, Rituparna Kanungo, Aleksandra Kelic-Heil, Ronja Knoebel, Thorsten Kroell, Reiner Kruecken, J. Kurcewicz, Nikolaus Kurz, Marc Labiche, Christoph Langer, Tudi Le Bleis, Roy Lemmon, Olga Lepyoshkina, Simon Lindberg, Jorge Machado, Justyna Marganiec, Magdalena Mostazo Caro, Alina Movsesyan, Mohammad Ali Najafi, Thomas Nilsson, Chiara Nociforo, Valerii Panin, Stefanos Paschalis, Angel Perea, Marina Petri, S. Pietri, Ralf Plag, A. Prochazka, Md. Anisur Rahaman, Ganna Rastrepina, Rene Reifarth, Guillermo Ribeiro, M. Valentina Ricciardi, Catherine Rigollet, Karsten Riisager, Dominic Rossi, Jose Sanchez del Rio Saez, Deniz Savran, Heiko Scheit, Haik Simon, Olivier Sorlin, V. Stoica, Branislav Streicher, Jon Taylor, Olof Tengblad, Satoru Terashima, Ronja Thies, Yasuhiro Togano, Ethan Uberseder, J. Van de Walle, Paulo Velho, Vasily Volkov, Andreas Wagner, Felix Wamers, Helmut Weick, Mario Weigand, Carl Wheldon, G. Wilson, Christine Wimmer, J. S. Winfield, Philip Woods, Dmitry Yakorev, Mikhail Zhukov, Andreas Zilges, Kai Zuber

      PHYSICAL REVIEW C93 ( 6 )   2016年6月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      Neutron-rich light nuclei and their reactions play an important role in the creation of chemical elements. Here, data from a Coulomb dissociation experiment on N-20,N-21 are reported. Relativistic N-20,N-21 ions impinged on a lead target and the Coulomb dissociation cross section was determined in a kinematically complete experiment. Using the detailed balance theorem, the N-19(n,gamma)N-20 and N-20(n,gamma)N-21 excitation functions and thermonuclear reaction rates have been determined. The N-19(n,gamma)N-20 rate is up to a factor of 5 higher at T &lt; 1 GK with respect to previous theoretical calculations, leading to a 10% decrease in the predicted fluorine abundance.

      DOI: 10.1103/PhysRevC.93.065807

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    • Systematic investigation of projectile fragmentation using beams of unstable B and C isotopes 査読有り

      R. Thies, A. Heinz, T. Adachi, Y. Aksyutina, J. Alcantara-Nunes, S. Altstadt, H. Alvarez-Pol, N. Ashwood, T. Aumann, V. Avdeichikov, M. Barr, S. Beceiro-Novo, D. Bemmerer, J. Benlliure, C. A. Bertulani, K. Boretzky, M. J. G. Borge, G. Burgunder, M. Camano, C. Caesar, E. Casarejos, W. Catford, J. Cederkall, S. Chakraborty, M. Chartier, L. V. Chulkov, D. Cortina-Gil, R. Crespo, U. Datta, P. Diaz Fernandez, I. Dillmann, Z. Elekes, J. Enders, O. Ershova, A. Estrade, F. Farinon, L. M. Fraile, M. Freer, M. Freudenberger, H. O. U. Fynbo, D. Galaviz, H. Geissel, R. Gernhauser, K. Gobel, P. Golubev, D. Gonzalez Diaz, J. Hagdahl, T. Heftrich, M. Heil, M. Heine, A. Henriques, M. Holl, G. Ickert, A. Ignatov, B. Jakobsson, H. T. Johansson, B. Jonson, N. Kalantar-Nayestanaki, R. Kanungo, R. Knobel, T. Kroll, R. Krucken, J. Kurcewicz, N. Kurz, M. Labiche, C. Langer, T. Le Bleis, R. Lemmon, O. Lepyoshkina, S. Lindberg, J. Machado, J. Marganiec, V. Maroussov, M. Mostazo, A. Movsesyan, A. Najafi, T. Nilsson, C. Nociforo, V. Panin, S. Paschalis, A. Perea, M. Petri, S. Pietri, R. Plag, A. Prochazka, A. Rahaman, G. Rastrepina, R. Reifarth, G. Ribeiro, M. V. Ricciardi, C. Rigollet, K. Riisager, M. Roder, D. Rossi, J. Sanchez del Rio, D. Savran, H. Scheit, H. Simon, O. Sorlin, V. Stoica, B. Streicher, J. T. Taylor, O. Tengblad, S. Terashima, Y. Togano, E. Uberseder, J. Van de Walle, P. Velho, V. Volkov, A. Wagner, F. Wamers, H. Weick, M. Weigand, C. Wheldon, G. Wilson, C. Wimmer, J. S. Winfield, P. Woods, D. Yakorev, M. V. Zhukov, A. Zilges, K. Zuber

      PHYSICAL REVIEW C93 ( 5 )   2016年5月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      Background: Models describing nuclear fragmentation and fragmentation fission deliver important input for planning nuclear physics experiments and future radioactive ion beam facilities. These models are usually benchmarked against data from stable beam experiments. In the future, two-step fragmentation reactions with exotic nuclei as stepping stones are a promising tool for reaching the most neutron-rich nuclei, creating a need for models to describe also these reactions.
      Purpose: We want to extend the presently available data on fragmentation reactions towards the light exotic region on the nuclear chart. Furthermore, we want to improve the understanding of projectile fragmentation especially for unstable isotopes.
      Method: We have measured projectile fragments from (10,12-18C) and B10-15 isotopes colliding with a carbon target. These measurements were all performed within one experiment, which gives rise to a very consistent data set. We compare our data to model calculations.
      Results: One-proton removal cross sections with different final neutron numbers (1 pxn) for relativistic C-10,C-12-18 and B10-15 isotopes impinging on a carbon target. Comparing model calculations to the data, we find that the EPAX code is not able to describe the data satisfactorily. Using ABRABLA07 on the other hand, we find that the average excitation energy per abraded nucleon needs to be decreased from 27 MeV to 8.1 MeV. With that decrease ABRABLA07 describes the data surprisingly well.
      Conclusions: Extending the available data towards light unstable nuclei with a consistent set of new data has allowed a systematic investigation of the role of the excitation energy induced in projectile fragmentation. Most striking is the apparent mass dependence of the average excitation energy per abraded nucleon. Nevertheless, this parameter, which has been related to final-state interactions, requires further study.

      DOI: 10.1103/PhysRevC.93.054601

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    • Mapping the deformation in the "island of inversion": Inelastic scattering of Ne-30 and Mg-36 at intermediate energies 査読有り

      P. Doornenbal, H. Scheit, S. Takeuchi, N. Aoi, K. Li, M. Matsushita, D. Steppenbeck, H. Wang, H. Baba, E. Ideguchi, N. Kobayashi, Y. Kondo, J. Lee, S. Michimasa, T. Motobayashi, A. Poves, H. Sakurai, M. Takechi, Y. Togano, K. Yoneda

      PHYSICAL REVIEW C93 ( 4 ) 044306   2016年4月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      The transition strengths of the first-excited 2(+) states and deformation lengths of the nuclei Ne-30 and Mg-36 were determined via Coulomb-and nuclear-force-dominated inelastic scattering at intermediate energies. Beams of these exotic nuclei were produced at the RIKEN Radioactive Isotope Beam Factory and were incident on lead and carbon targets at energies above 200 MeV/u. Absolute excitation cross sections on the lead target yielded reduced transition probabilities of 0.0277(79) and 0.0528(121) e(2) b(2), while the measurements with the carbon target revealed nuclear deformation lengths of delta(N) = 1.98(11) and 1.93(11) fm for Ne-30 and Mg-36, respectively. Corresponding quadrupole deformation parameters of beta(2) similar to 0.5 from the two probes were found comparable in magnitude, showing no indication for a reduction in deformation along isotopic and isotonic chains from Mg-32 towards the neutron drip-line. Comparisons to shell-model calculations illustrate the importance of neutron excitations across the N = 20 shell for Ne-30 and suggest that shallow maximums of collectivity may occur around N = 22 and 24 along the neon and magnesium isotopic chains, respectively.

      DOI: 10.1103/PhysRevC.93.044306

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    • Spectroscopy of <sup>17</sup>C via one-neutron knockout reaction 査読有り

      Sunji Kim, Jongwon Hwang, Yoshiteru Satou, Nigel A. Orr, Takashi Nakamura, Yosuke Kondo, Julien Gibelin, N. Lynda Achouri, Thomas Aumann, Hidetada Baba, Franck Delaunay, Pieter Doornenbal, Naoki Fukuda, Naohito Inabe, Tadaaki Isobe, Daisuke Kameda, Daiki Kanno, Nobuyuki Kobayashi, Toshio Kobayashi, Toshiyuki Kubo, Sylvain Leblond, Jenny Lee, F. Miguel Marqués, Ryogo Minakata, Tohru Motobayashi, Daichi Murai, Tetsuya Murakami, Kotomi Muto, Tomohiro Nakashima, Noritsugu Nakatsuka, Alahari Navin, Seijiro Nishi, Shun Ogoshi, Hideaki Otsu, Hiromi Sato, Yohei Shimizu, Hiroshi Suzuki, Kento Takahashi, Hiroyuki Takeda, Satoshi Takeuchi, Ryuki Tanaka, Yasuhiro Togano, Adam G. Tuff, Marine Vandebrouck, Ken Ichiro Yoneda

      EPJ Web of Conferences113   2016年3月25日

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

      © 2016 Owned by the authors, published by EDP Sciences. A spectroscopic study of 17C was performed via the one-neutron knockout reaction of 18C on a carbon target at RIKEN-RIBF. Three unbound states at excitation energies of 2.66(2), 3.16(5), and 3.97(3) MeV (preliminary) were observed. The energies are compared with shell-model calculations and existing measurements to deduce their spin-parities. From the comparison, the states at 2.66(2) and 3.97(3) MeV are suggested to be 1/2- and 3/2-, respectively. From its decay property, the state at 3.16(5) MeV is indicated to be 9/2+.

      DOI: 10.1051/epjconf/201611306010

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    • Study of <sup>19</sup>C by One-Neutron Knockout 査読有り

      Jongwon Hwang, Sunji Kim, Yoshiteru Satou, Nigel A. Orr, Takashi Nakamura, Yosuke Kondo, Julien Gibelin, N. Lynda Achouri, Thomas Aumann, Hidetada Baba, Franck Delaunay, Pieter Doornenbal, Naoki Fukuda, Naohito Inabe, Tadaaki Isobe, Daisuke Kameda, Daiki Kanno, Nobuyuki Kobayashi, Toshio Kobayashi, Toshiyuki Kubo, Sylvain Leblond, Jenny Lee, F. Miguel Marqués, Ryogo Minakata, Tohru Motobayashi, Daichi Murai, Tetsuya Murakami, Kotomi Muto, Tomohiro Nakashima, Noritsugu Nakatsuka, Alahari Navin, Seijiro Nishi, Shun Ogoshi, Hideaki Otsu, Hiromi Sato, Yohei Shimizu, Hiroshi Suzuki, Kento Takahashi, Hiroyuki Takeda, Satoshi Takeuchi, Ryuki Tanaka, Yasuhiro Togano, Adam G. Tuff, Marine Vandebrouck, Ken Ichiro Yoneda

      EPJ Web of Conferences113   2016年3月25日

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

      © 2016 Owned by the authors, published by EDP Sciences. The spectroscopic structure of 19C, a prominent one-neutron halo nucleus, has been studied with a 20C secondary beam at 290 MeV/nucleon and a carbon target. Neutron-unbound states populated by the one-neutron knockout reaction were investigated by means of the invariant mass method. The preliminary relative energy spectrum and parallel momentum distribution of the knockout residue, 19C∗, were reconstructed from the measured four momenta of the 18C fragment, neutron, and beam. Three resonances were observed in the spectrum, which correspond to the states at Ex = 0.62(9), 1.42(10), and 2.89(10) MeV. The parallel momentum distributions for the 0.62-MeV and 2.89-MeV states suggest spin-parity assignments of 5/2+ and 1/2-, respectively. The 1.42-MeV state is in line with the reported 5/22+ state.

      DOI: 10.1051/epjconf/201611306014

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    • Nucleus O-26: A Barely Unbound System beyond the Drip Line 査読有り

      Y. Kondo, T. Nakamura, R. Tanaka, R. Minakata, S. Ogoshi, N. A. Orr, N. L. Achouri, T. Aumann, H. Baba, F. Delaunay, P. Doornenbal, N. Fukuda, J. Gibelin, J. W. Hwang, N. Inabe, T. Isobe, D. Kameda, D. Kanno, S. Kim, N. Kobayashi, T. Kobayashi, T. Kubo, S. Leblond, J. Lee, F. M. Marques, T. Motobayashi, D. Murai, T. Murakami, K. Muto, T. Nakashima, N. Nakatsuka, A. Navin, S. Nishi, H. Otsu, H. Sato, Y. Satou, Y. Shimizu, H. Suzuki, K. Takahashi, H. Takeda, S. Takeuchi, Y. Togano, A. G. Tuff, M. Vandebrouck, K. Yoneda

      PHYSICAL REVIEW LETTERS116 ( 10 ) 102503   2016年3月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      The unbound nucleus O-26 has been investigated using invariant-mass spectroscopy following one-proton removal reaction from a F-27 beam at 201 MeV/nucleon. The decay products, O-24 and two neutrons, were detected in coincidence using the newly commissioned SAMURAI spectrometer at the RIKEN Radioactive Isotope Beam Factory. The O-26 ground-state resonance was found to lie only 18 +/- (stat) +/- 4dsyst keV above threshold. In addition, a higher lying level, which is most likely the first 2(+) state, was observed for the first time at 1.28(-0.08)(+0.11) MeV above threshold. Comparison with theoretical predictions suggests that three-nucleon forces, pf-shell intruder configurations, and the continuum are key elements to understanding the structure of the most neutron-rich oxygen isotopes beyond the drip line.

      DOI: 10.1103/PhysRevLett.116.102503

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    • One-neutron removal from Ne 29: Defining the lower limits of the island of inversion 査読有り

      N. Kobayashi, T. Nakamura, Y. Kondo, J. A. Tostevin, N. Aoi, H. Baba, R. Barthelemy, M. A. Famiano, N. Fukuda, N. Inabe, M. Ishihara, R. Kanungo, S. Kim, T. Kubo, G. S. Lee, H. S. Lee, M. Matsushita, T. Motobayashi, T. Ohnishi, N. A. Orr, H. Otsu, T. Sako, H. Sakurai, Y. Satou, T. Sumikama, H. Takeda, S. Takeuchi, R. Tanaka, Y. Togano, K. Yoneda

      Physical Review C93 ( 1 )   2016年1月20日

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      掲載種別:研究論文(学術雑誌)  

      © 2016 American Physical Society. Background: Very neutron-rich isotopes, including Ne30-32, in the vicinity of N=20 are known to exhibit ground states dominated by fp-shell intruder configurations: the "island of inversion. " Systematics for the Ne-isotopic chain suggest that such configurations may be in strong competition with normal shell-model configurations in the ground state of Ne29. Purpose: A determination of the structure of Ne29 is thus important to delineate the extent of the island of inversion and better understand structural evolution in neutron-rich Ne isotopes. This is accomplished here through a combined investigation of nuclear and Coulomb-induced one-neutron removal reactions. Method: Cross sections for one-neutron removal on carbon and lead targets and the parallel momentum distribution of the Ne28 residues from the carbon target are measured at around 240 MeV/nucleon. The measurements are compared with reaction calculations combined with spectroscopic information from SDPF-M shell-model wave functions. Results: The deduced width of the inclusive parallel momentum distribution, 98(12) MeV/c (FWHM), suggests that the ground state of Ne29 has a spin parity of 3/2-. Detailed comparisons of the measured inclusive and partial cross sections of the two targets and the parallel momentum distribution of the carbon target with reaction calculations, combined with spectroscopic information from large-scale shell-model calculations, are all consistent with a 3/2- spin-parity assignment. Conclusions: The results indicate that Ne29 lies within the island of inversion and that the ground state of Ne29 is dominated by a Ne28(01+) - 2p3/2 neutron configuration. Combined with recently measured interaction cross sections, it is concluded that Ne29 may exhibit a moderately developed halo-like distribution.

      DOI: 10.1103/PhysRevC.93.014613

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    • One-neutron removal from Ne-29: Defining the lower limits of the island of inversion 査読有り

      N. Kobayashi, T. Nakamura, Y. Kondo, J. A. Tostevin, N. Aoi, H. Baba, R. Barthelemy, M. A. Famiano, N. Fukuda, N. Inabe, M. Ishihara, R. Kanungo, S. Kim, T. Kubo, G. S. Lee, H. S. Lee, M. Matsushita, T. Motobayashi, T. Ohnishi, N. A. Orr, H. Otsu, T. Sako, H. Sakurai, Y. Satou, T. Sumikama, H. Takeda, S. Takeuchi, R. Tanaka, Y. Togano, K. Yoneda

      PHYSICAL REVIEW C93 ( 1 ) 014613   2016年1月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      Background: Very neutron-rich isotopes, including Ne30-32, in the vicinity of N = 20 are known to exhibit ground states dominated by fp-shell intruder configurations: the "island of inversion." Systematics for the Ne-isotopic chain suggest that such configurations may be in strong competition with normal shell-model configurations in the ground state of Ne-29.
      Purpose: A determination of the structure of Ne-29 is thus important to delineate the extent of the island of inversion and better understand structural evolution in neutron-rich Ne isotopes. This is accomplished here through a combined investigation of nuclear and Coulomb-induced one-neutron removal reactions.
      Method: Cross sections for one-neutron removal on carbon and lead targets and the parallel momentum distribution of the Ne-28 residues from the carbon target are measured at around 240 MeV/nucleon. The measurements are compared with reaction calculations combined with spectroscopic information from SDPF-M shell-model wave functions.
      Results: The deduced width of the inclusive parallel momentum distribution, 98(12) MeV/c (FWHM), suggests that the ground state of Ne-29 has a spin parity of 3/2(-). Detailed comparisons of the measured inclusive and partial cross sections of the two targets and the parallel momentum distribution of the carbon target with reaction calculations, combined with spectroscopic information from large-scale shell-model calculations, are all consistent with a 3/2(-) spin-parity assignment.
      Conclusions: The results indicate that Ne-29 lies within the island of inversion and that the ground state of Ne-29 is dominated by a Ne-28(0(1)(+)) circle times 2p(3/2) neutron configuration. Combined with recently measured interaction cross sections, it is concluded that Ne-29 may exhibit a moderately developed halo-like distribution.

      DOI: 10.1103/PhysRevC.93.014613

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    • Reaction cross section of the two-neutron halo nucleus <sup>22</sup>C at 235 MeV/nucleon

      Y. Togano, T. Nakamura, Y. Kondo, N. Kobayashi, R. Tanaka, R. Minakata, S. Ogoshi, S. Nishi, D. Kanno, T. Nakashima, J. Tsubota, A. T. Saito, J. A. Tostevin, N. A. Orr, J. Gibelin, F. Delaunay, F. M. Marques, N. L. Achouri, S. Leblond, Q. Deshayes, K. Yoneda, T. Motobayashi, H. Otsu, T. Isobe, H. Baba, H. Sato, Y. Shimizu, T. Kubo, N. Inabe, N. Fukuda, D. Kameda, H. Suzuki, H. Takeda, J. Lee, P. Doornenbal, S. Takeuchi, T. Kobayashi, K. Takahashi, K. Muto, T. Murakami, N. Nakatsuka, Y. Satou, S. Kim, J. Hwang, T. Aumann, D. Murai, A. Navin, A. G. Tuff, M. Vandebrouck

      Proceedings of Science2016-September   2016年

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      掲載種別:研究論文(国際会議プロシーディングス)  

      © Copyright owned by the author(s). The reaction cross section (σR) of the very neutron-rich carbon isotope 22C has been measured on a carbon target at 235 MeV/nucleon. A σR of 1.280 ± 0.023 b was obtained for 22C, significantly larger than those for the neighboring isotopes, supporting the halo character of 22C. A 22C root-mean-squared matter radius of 3.44±0.08 fm was deduced using a four-body Glauber reaction model. This value is smaller than an earlier estimate of 5.4±0.9 fm derived from a σR measurement on a hydrogen target at 40 MeV/nucleon.

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    • Spectroscopy of C-17 via one-neutron knockout reaction 査読有り

      Sunji Kim, Jongwon Hwang, Yoshiteru Satou, Nigel A. Orr, Takashi Nakamura, Yosuke Kondo, Julien Gibelin, N. Lynda Achouri, Thomas Aumann, Hidetada Baba, Franck Delaunay, Pieter Doornenbal, Naoki Fukuda, Naohito Inabe, Tadaaki Isobe, Daisuke Kameda, Daiki Kanno, Nobuyuki Kobayashi, Toshio Kobayashi, Toshiyuki Kubo, Sylvain Leblond, Jenny Lee, F. Miguel Marques, Ryogo Minakata, Tohru Motobayashi, Daichi Murai, Tetsuya Murakami, Kotomi Muto, Tomohiro Nakashima, Noritsugu Nakatsuka, Alahari Navin, Seijiro Nishi, Shun Ogoshi, Hideaki Otsu, Hiromi Sato, Yohei Shimizu, Hiroshi Suzuki, Kento Takahashi, Hiroyuki Takeda, Satoshi Takeuchi, Ryuki Tanaka, Yasuhiro Togano, Adam G. Tuff, Marine Vandebrouck, Ken-ichiro Yoneda

      21ST INTERNATIONAL CONFERENCE ON FEW-BODY PROBLEMS IN PHYSICS113   2016年

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:E D P SCIENCES  

      A spectroscopic study of C-17 was performed via the one-neutron knockout reaction of C-18 on a carbon target at RIKEN-RIBF. Three unbound states at excitation energies of 2.66(2), 3.16(5), and 3.97(3) MeV (preliminary) were observed. The energies are compared with shell-model calculations and existing measurements to deduce their spin-parities. From the comparison, the states at 2.66(2) and 3.97(3) MeV are suggested to be 1/2-and 3/2-, respectively. From its decay property, the state at 3.16(5) MeV is indicated to be 9/2(+).

      DOI: 10.1051/epjconf/201611306010

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    • Study of C-19 by One-Neutron Knockout 査読有り

      Jongwon Hwang, Sunji Kim, Yoshiteru Satou, Nigel A. Orr, Takashi Nakamura, Yosuke Kondo, Julien Gibelin, N. Lynda Achouri, Thomas Aumann, Hidetada Baba, Franck Delaunay, Pieter Doornenbal, Naoki Fukuda, Naohito Inabe, Tadaaki Isobe, Daisuke Kameda, Daiki Kanno, Nobuyuki Kobayashi, Toshio Kobayashi, Toshiyuki Kubo, Sylvain Leblond, Jenny Lee, F. Miguel Marques, Ryogo Minakata, Tohru Motobayashi, Daichi Murai, Tetsuya Murakami, Kotomi Muto, Tomohiro Nakashima, Noritsugu Nakatsuka, Alahari Navin, Seijiro Nishi, Shun Ogoshi, Hideaki Otsu, Hiromi Sato, Yohei Shimizu, Hiroshi Suzuki, Kento Takahashi, Hiroyuki Takeda, Satoshi Takeuchi, Ryuki Tanaka, Yasuhiro Togano, Adam G. Tuff, Marine Vandebrouck, Ken-ichiro Yoneda

      21ST INTERNATIONAL CONFERENCE ON FEW-BODY PROBLEMS IN PHYSICS113   2016年

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:E D P SCIENCES  

      The spectroscopic structure of C-19, a prominent one-neutron halo nucleus, has been studied with a C-20 secondary beam at 290 MeV/nucleon and a carbon target. Neutron-unbound states populated by the one-neutron knockout reaction were investigated by means of the invariant mass method. The preliminary relative energy spectrum and parallel momentum distribution of the knockout residue, C-19*, were reconstructed from the measured four momenta of the C-18 fragment, neutron, and beam. Three resonances were observed in the spectrum, which correspond to the states at E-x = 0.62(9), 1.42(10), and 2.89(10) MeV. The parallel momentum distributions for the 0.62-MeV and 2.89-MeV states suggest spin-parity assignments of 5/2(+) and 1/2(-), respectively. The 1.42-MeV state is in line with the reported 5/2(2)(+) state.

      DOI: 10.1051/epjconf/201611306014

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    • γ-ray spectroscopy of 19C via the single-neutron knock-out reaction 査読有り

      Zs.Vajta, Zs.Dombradi, Z.Elekes, T.Aiba, N.Aoi, H.Baba, D.Bemmerer, Zs.Fulop, N.Iwasa, A.Kiss, T.Kobayashi, Y.Kondo, T.Motobayashi, T.Nakabayashi, T.Nannichi, H.Sakurai, D.Sohler, S.Takeuchi, K.Tanaka, Y.Togano, K.Yamada, M.Yamaguchi, K.Yoneda

      Physical Review C91 ( 6 ) 064315   2015年6月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Physical Society  

      DOI: 10.1103/PhysRevC.91.064315

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    • Different mechanism of two-proton emission from proton-rich nuclei Al-23 and Mg-22 査読有り

      Y. G. Ma, D. Q. Fang, X. Y. Sun, P. Zhou, Y. Togano, N. Aoi, H. Baba, X. Z. Cai, X. G. Cao, J. G. Chen, Y. Fu, W. Guo, Y. Hara, T. Honda, Z. G. Hu, K. Ieki, Y. Ishibashi, Y. Ito, N. Iwasa, S. Kanno, T. Kawabata, H. Kimura, Y. Kondo, K. Kurita, M. Kurokawa, T. Moriguchi, H. Murakami, H. Ooishi, K. Okada, S. Ota, A. Ozawa, H. Sakurai, S. Shimoura, R. Shioda, E. Takeshita, S. Takeuchi, W. D. Tian, H. W. Wang, J. S. Wang, M. Wang, K. Yamada, Y. Yamada, Y. Yasuda, K. Yoneda, G. Q. Zhang, T. Motobayashi

      PHYSICS LETTERS B743   306 - 309   2015年4月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

      Two-proton relative momentum (q(pp)) and opening angle (theta(pp)) distributions from the three-body decay of two excited proton-rich nuclei, namely Al-23 --&gt; p + p + Na-21 and Mg-22 --&gt; p + p + Ne-20, have been measured with the projectile fragment separator (RIPS) at the RIKEN RI Beam Factory. An evident peak at q(pp) similar to 20 MeV/c as well as a peak in theta(pp) around 30 degrees are seen in the two-proton break-up channel from a highly-excited Mg-22. In contrast, such peaks are absent for the Al-23 case. It is concluded that the two-proton emission mechanism of excited Mg-22 is quite different from the Al-23 case, with the former having a favorable diproton emission component at a highly excited state and the latter dominated by the sequential decay process. (C) 2015 The Authors. Published by Elsevier B.V.

      DOI: 10.1016/j.physletb.2015.02.066

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    • Neutron occupancy of the 0d(5/2) orbital and the N=16 shell closure in O-24 査読有り

      K. Tshoo, Y. Satou, C. A. Bertulani, H. Bhang, S. Choi, T. Nakamura, Y. Kondo, S. Deguchi, Y. Kawada, Y. Nakayama, K. N. Tanaka, N. Tanaka, Y. Togano, N. Kobayashi, N. Aoi, M. Ishihara, T. Motobayashi, H. Otsu, H. Sakurai, S. Takeuchi, K. Yoneda, F. Delaunay, J. Gibelin, F. M. Marques, N. A. Orr, T. Honda, T. Kobayashi, T. Sumikama, Y. Miyashita, K. Yoshinaga, M. Matsushita, S. Shimoura, D. Sohler, J. W. Hwang, T. Zheng, Z. H. Li, Z. X. Cao

      PHYSICS LETTERS B739   19 - 22   2014年12月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

      One-neutron knockout from O-24 leading to the first excited state in O-23 has been measured for a proton target at a beam energy of 62 MeV/nucleon. The decay energy spectrum of the neutron unbound state of O-23 was reconstructed from the measured four momenta of the O-22 fragment and emitted neutron. A sharp peak was found at E-decay = 50 +/- 3 keV, corresponding to an excited state in O-23 at 2.78 +/- 0.11 MeV, as observed in previous measurements. The longitudinal momentum distribution for this state was consistent with d-wave neutron knockout, providing support for a J(pi) assignment of 5/2(+). The associated spectroscopic factor was deduced to be C-2 S(0d(5/2)) = 4.1 +/- 0.4 by comparing the measured cross section (sigma(exp)(-1n) = 61 +/- 6 mb) with a distorted wave impulse approximation calculation. Such a large occupancy for the neutron 0d(5/2) orbital is in line with the N = 16 shell closure in O-24. (C) 2014 The Authors. Published by Elsevier B.V.

      DOI: 10.1016/j.physletb.2014.10.033

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    • DALI2: A NaI(Tl) detector array for measurements of gamma rays from fast nuclei 査読有り

      S. Takeuchi, T. Motobayashi, Y. Togano, M. Matsushita, N. Aoi, K. Demichi, H. Hasegawa, H. Murakami

      NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT763   596 - 603   2014年11月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

      A NaI(Tl) detector array called DALI2 (Detector Array for Low Intensity radiation 2) has been constructed for in beam gamma-ray spectroscopy experiments with fast radioactive isotope (RI) beams. It consists typically of 186 NaI(Tl) scintillators covering polar angles from similar to 15 degrees to similar to 160 degrees with an average angular resolution of 6 degrees in full width at half maximum. Its high granularity (good angular resolution) enables Doppler-shift corrections that result in, for example, 10% energy resolution and 20% full energy photopeak efficiency for 1-MeV gamma rays emitted from fast-moving nuclei (velocities of v/c similar or equal to 0.6). DALI2 has been employed successfully in numerous experiments using fast RI beams with velocities of v/c=0.3-0.6 provided by the RIKEN RI Beam Factory. (C) 2014 Elsevier B.V. All rights reserved.

      DOI: 10.1016/j.nima.2014.06.087

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    • Elastic scattering of Al 25 +p to explore the resonance structure in Si 26 査読有り

      H. S. Jung, C. S. Lee, Y. K. Kwon, J. Y. Moon, J. H. Lee, C. C. Yun, M. J. Kim, T. Hashimoto, H. Yamaguchi, D. Kahl, S. Kubono, Y. Wakabayashi, Y. Togano, Seonho Choi, Y. H. Kim, Y. K. Kim, J. S. Park, E. J. Kim, C. B. Moon, T. Teranishi, N. Iwasa, T. Yamada, S. Kato, S. Cherubini, S. Hayakawa, G. G. Rapisarda

      Physical Review C - Nuclear Physics90 ( 3 )   2014年9月23日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Physical Society  

      Background: The properties of resonances in Si26 are important to better constrain the Al25(p,γ)Si26 reaction rate relevant to the synthesis of galactic Al26gs and energy generation in explosive stellar environment at higher temperature. Purpose: Al25+p elastic scattering was measured to further constrain and investigate disagreements in resonance parameters for the high-lying excited states of Si26 with high statistics and without background contamination within the target. Methods: The experiment was performed by bombarding a thick H2 target with an Al25 radioactive ion beam. The resonances at excitation energies of 6.6-8.3 MeV in the Si26 compound nucleus were studied at the low-energy radioactive-ion beam facility CRIB (Center for Nuclear Study Radioactive Ion Beam separator) at the University of Tokyo. Results: Six resonant states were observed and their resonance parameters were extracted by an R-matrix analysis. Our resonance parameters for two levels are in good agreement with the results of previous studies, while for four others, excitation energy, proton partial width, and spin-parity assignment disagree with the results of recent study via elastic scattering of Al25+p. Conclusion: The parameters of resonant states in Si26 determined in the present work for the Al25(p,γ)Si26 reaction rate are consistent with that of the previous result, solving spin-parity assignment discrepancies between experiments, relevant at higher temperatures.

      DOI: 10.1103/PhysRevC.90.035805

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    • Elastic scattering of Al-25 + p to explore the resonance structure in Si-26 査読有り

      H. S. Jung, C. S. Lee, Y. K. Kwon, J. Y. Moon, J. H. Lee, C. C. Yun, M. J. Kim, T. Hashimoto, H. Yamaguchi, D. Kahl, S. Kubono, Y. Wakabayashi, Y. Togano, Seonho Choi, Y. H. Kim, Y. K. Kim, J. S. Park, E. J. Kim, C. -B. Moon, T. Teranishi, N. Iwasa, T. Yamada, S. Kato, S. Cherubini, S. Hayakawa, G. G. Rapisarda

      PHYSICAL REVIEW C90 ( 3 ) 035805   2014年9月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      Background: The properties of resonances in Si-26 are important to better constrain the Al-25(p,gamma)Si-26 reaction rate relevant to the synthesis of galactic Al-26(gs) and energy generation in explosive stellar environment at higher temperature.
      Purpose: Al-25 + p elastic scattering was measured to further constrain and investigate disagreements in resonance parameters for the high-lying excited states of Si-26 with high statistics and without background contamination within the target.
      Methods: The experiment was performed by bombarding a thick H-2 target with an Al-25 radioactive ion beam. The resonances at excitation energies of 6.6-8.3 MeV in the Si-26 compound nucleus were studied at the low-energy radioactive-ion beam facility CRIB (Center for Nuclear Study Radioactive Ion Beam separator) at the University of Tokyo.
      Results: Six resonant states were observed and their resonance parameters were extracted by an R-matrix analysis. Our resonance parameters for two levels are in good agreement with the results of previous studies, while for four others, excitation energy, proton partial width, and spin-parity assignment disagree with the results of recent study via elastic scattering of Al-25 + p.
      Conclusion: The parameters of resonant states in Si-26 determined in the present work for the Al-25(p,gamma)Si-26 reaction rate are consistent with that of the previous result, solving spin-parity assignment discrepancies between experiments, relevant at higher temperatures.

      DOI: 10.1103/PhysRevC.90.035805

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    • Observation of a p-Wave One-Neutron Halo Configuration in Mg-37 査読有り

      N. Kobayashi, T. Nakamura, Y. Kondo, J. A. Tostevin, Y. Utsuno, N. Aoi, H. Baba, R. Barthelemy, M. A. Famiano, N. Fukuda, N. Inabe, M. Ishihara, R. Kanungo, S. Kim, T. Kubo, G. S. Lee, H. S. Lee, M. Matsushita, T. Motobayashi, T. Ohnishi, N. A. Orr, H. Otsu, T. Otsuka, T. Sako, H. Sakurai, Y. Satou, T. Sumikama, H. Takeda, S. Takeuchi, R. Tanaka, Y. Togano, K. Yoneda

      PHYSICAL REVIEW LETTERS112 ( 24 ) 242501   2014年6月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      Cross sections of 1n-removal reactions from the neutron-rich nucleus Mg-37 on C and Pb targets and the parallel momentum distributions of the Mg-37 residues from the C target have been measured at 240 MeV/nucleon. A combined analysis of these distinct nuclear-and Coulomb-dominated reaction data shows that the Mg-37 ground state has a small 1n separation energy of 0.22(-0.09)(+0.12) MeV and an appreciable p-wave neutron single-particle strength. These results confirm that Mg-37 lies near the edge of the "island of inversion" and has a sizable p-wave neutron halo component, the heaviest such system identified to date.

      DOI: 10.1103/PhysRevLett.112.242501

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    • First Experimental Constraint on the Fe-59(n, gamma)Fe-60 Reaction Cross Section at Astrophysical Energies via the Coulomb Dissociation of Fe-60 査読有り

      E. Uberseder, T. Adachi, T. Aumann, S. Beceiro-Novo, K. Boretzky, C. Caesar, I. Dillmann, O. Ershova, A. Estrade, F. Farinon, J. Hagdahl, T. Heftrich, M. Heil, M. Heine, M. Holl, A. Ignatov, H. T. Johansson, N. Kalantar, C. Langer, T. Le Bleis, Yu. A. Litvinov, J. Marganiec, A. Movsesyan, M. A. Najafi, T. Nilsson, C. Nociforo, V. Panin, S. Pietri, R. Plag, A. Prochazka, G. Rastrepina, R. Reifarth, V. Ricciardi, C. Rigollet, D. M. Rossi, D. Savran, H. Simon, K. Sonnabend, B. Streicher, S. Terashima, R. Thies, Y. Togano, V. Volkov, F. Wamers, H. Weick, M. Weigand, M. Wiescher, C. Wimmer, N. Winckler, P. J. Woods

      PHYSICAL REVIEW LETTERS112 ( 21 )   2014年5月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      The radionuclide Fe-60 has been of great interest to the nuclear astrophysics community for over a decade. An initial discrepancy between the observed and modeled Galactic Fe-60/Al-26 ratio motivated numerous studies focused on the nucleosynthesis of these two isotopes, though the cross section of the primary astrophysical production reaction, Fe-59(n,gamma)Fe-60, has remained purely theoretical. The present work offers a first experimental constraint on the Fe-59(n,gamma)Fe-60 cross section at astrophysical energies, obtained indirectly via Coulomb dissociation, and demonstrates that the theoretical reaction rates used in present stellar models are not highly erroneous.

      DOI: 10.1103/PhysRevLett.112.211101

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    • Quadrupole collectivity in island-of-inversion nuclei Ne-28,Ne-30 and Mg-34,Mg-36 査読有り

      S. Michimasa, Y. Yanagisawa, K. Inafuku, N. Aoi, Z. Elekes, Zs. Fueloep, Y. Ichikawa, N. Iwasa, K. Kurita, M. Kurokawa, T. Machida, T. Motobayashi, T. Nakamura, T. Nakabayashi, M. Notani, H. J. Ong, T. K. Onishi, H. Otsu, H. Sakurai, M. Shinohara, T. Sumikama, S. Takeuchi, K. Tanaka, Y. Togano, K. Yamada, M. Yamaguchi, K. Yoneda

      PHYSICAL REVIEW C89 ( 5 ) 054307   2014年5月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      The quadrupole collectivity of neutron-rich even-even neon and magnesium nuclei around N = 20, Ne-28,Ne-30, and Mg-32,Mg-34,Mg-36, was studied via proton inelastic scattering on a liquid hydrogen target by in-beam gamma-ray spectroscopy in inverse kinematics. The angle-integrated cross sections for the first 2(+) states of these nuclei were determined by measuring de-excitation gamma rays. The deformation lengths were extracted from the angle-integrated cross sections using distorted-wave calculations. The deformation length of 30Ne (delta(( p, p')) = 1.59(-0.09)(+ 0.08) fm) is smaller than that of Mg-32 ( 1.83(- 0.11)(+ 0.10) fm), which exhibits the largest quadrupole collectivity among the neutron-rich N = 20 isotones. Along the magnesium isotopic chain, the deformation lengths of Mg-34 and Mg-36 were deduced to be 2.30(- 0.10)(+ 0.09) fm and 1.90(- 0.17)(+ 0.16) fm, respectively. The evolution of quadrupole deformation in the vicinity of Mg-32 is discussed by comparing the present results with the theoretical calculations.

      DOI: 10.1103/PhysRevC.89.054307

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    • Rotational level structure of sodium isotopes inside the "island of inversion" 査読有り

      P. Doornenbal, H. Scheit, S. Takeuchi, Y. Utsuno, N. Aoi, K. Li, M. Matsushita, D. Steppenbeck, H. Wang, H. Baba, E. Ideguchi, N. Kobayashi, Y. Kondo, J. Lee, S. Michimasa, T. Motobayashi, T. Otsuka, H. Sakurai, M. Takechi, Y. Togano, K. Yoneda

      PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS2014 ( 5 ) 053D01   2014年5月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:OXFORD UNIV PRESS INC  

      The neutron-rich nuclei Na-33,Na-34,Na-35 were studied via in-beam gamma-ray spectroscopy following nucleon removal reactions from a Mg-36 secondary beam at similar to 220 MeV/u. Excited states of Na-34,Na-35 are reported for the first time. A third transition was observed for Na-33 in addition to the known 7/2(1)(+) -&gt; 5/2(1)(+) -&gt; 3/2(g.s)(+). cascade and is suggested to be the 9/2(1)(+) -&gt; 7/2(1)(+) transition. Similarly, a 7/2(1)(+) -&gt; 5/2(1)(+) -&gt; 3/2(g.s.)(+) cascade is proposed for the decay pattern observed for Na-35. The transition energy ratios are close to expectation values for K = 3/2 rotational bands in the strong coupling limit. Comparisons to large-scale shell model calculations in the sd-pf model space support the spin-parity assignments.

      DOI: 10.1093/ptep/ptu057

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    • Deformation-Driven p-Wave Halos at the Drip Line: Ne-31 査読有り

      T. Nakamura, N. Kobayashi, Y. Kondo, Y. Satou, J. A. Tostevin, Y. Utsuno, N. Aoi, H. Baba, N. Fukuda, J. Gibelin, N. Inabe, M. Ishihara, D. Kameda, T. Kubo, T. Motobayashi, T. Ohnishi, N. A. Orr, H. Otsu, T. Otsuka, H. Sakurai, T. Sumikama, H. Takeda, E. Takeshita, M. Takechi, S. Takeuchi, Y. Togano, K. Yoneda

      PHYSICAL REVIEW LETTERS112 ( 14 ) 142501   2014年4月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      The halo structure of Ne-31 is studied using 1n-removal reactions on C and Pb targets at 230 MeV/nucleon. A combined analysis of the cross sections of these nuclear and Coulomb dominated reactions that feed directly the Ne-30 ground-state reveals Ne-31 to have a small neutron separation energy, 0.15(-0.10)(+0.16) MeV, and spin-parity 3/2(-). Consistency of the data with reaction and large-scale shell-model calculations identifies Ne-31 as deformed and having a significant p-wave halo component, suggesting that halos are more frequent occurrences at the neutron drip line.

      DOI: 10.1103/PhysRevLett.112.142501

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    • Shell and shape evolution at N=28: The Mg-40 ground state 査読有り

      H. L. Crawford, P. Fallon, A. O. Macchiavelli, R. M. Clark, B. A. Brown, J. A. Tostevin, D. Bazin, N. Aoi, P. Doornenbal, M. Matsushita, H. Scheit, D. Steppenbeck, S. Takeuchi, H. Baba, C. M. Campbell, M. Cromaz, E. Ideguchi, N. Kobayashi, Y. Kondo, G. Lee, I. Y. Lee, J. Lee, K. Li, S. Michimasa, T. Motobayashi, T. Nakamura, S. Ota, S. Paschalis, M. Petri, T. Sako, H. Sakurai, S. Shimoura, M. Takechi, Y. Togano, H. Wang, K. Yoneda

      PHYSICAL REVIEW C89 ( 4 ) 041303   2014年4月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      A measurement of the direct two-proton removal from Si-42 has provided the first structural information on the N = 28 isotone Mg-40. The value for the inclusive cross section for two-proton removal from 42Si of 40(-17)(+27) mu b is significantly lower than that predicted by structure calculations using the recent SDPF-MU shell-model effective interaction combined with eikonal reaction theory. This observed discrepancy is consistent with the interpretation that only one of the predicted low-lying 0(+) states in Mg-40 is bound. A two-state mixing analysis describing two-proton knockout cross sections along N = 28 provides support for the interpretation of a prolate-deformed Mg-40 ground state.

      DOI: 10.1103/PhysRevC.89.041303

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    • One-neutron knockout reaction of C-17 on a hydrogen target at 70 MeV/nucleon 査読有り

      Y. Satou, J. W. Hwang, S. Kim, K. Tshoo, S. Choi, T. Nakamura, Y. Kondo, N. Matsui, Y. Hashimoto, T. Nakabayashi, T. Okumura, M. Shinohara, N. Fukuda, T. Sugimoto, H. Otsu, Y. Togano, T. Motobayashi, H. Sakurai, Y. Yanagisawa, N. Aoi, S. Takeuchi, T. Gomi, M. Ishihara, S. Kawai, H. J. Ong, T. K. Onishi, S. Shimoura, M. Tamaki, T. Kobayashi, Y. Matsuda, N. Endo, M. Kitayama

      PHYSICS LETTERS B728   462 - 466   2014年1月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

      First experimental evidence of the population of the first 2(-) state in C-16 above the neutron threshold is obtained by neutron knockout from C-17 on a hydrogen target. The invariant mass method combined with in-beam gamma-ray detection is used to locate the state at 5.45(1) MeV. Comparison of its populating cross section and parallel momentum distribution with a Glauber model calculation utilizing the shell-model spectroscopic factor confirms the core-neutron removal nature of this state. Additionally, a previously known unbound state at 6.11 MeV and a new state at 6.28(2) MeV are observed. The position of the first 2(-) state, which belongs to a member of the lowest-lying p-sd cross shell transition, is reasonably well described by the shell-model calculation using the WBT interaction. (C) 2013 The Authors. Published by Elsevier B.V. All rights reserved.

      DOI: 10.1016/j.physletb.2013.12.024

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    • Investigation of the thermonuclear 18Ne(α, p)21Na reaction rate via resonant elastic scattering of 21Na + p 査読有り

      L.Y.Zhang, J.J.He, A.Parikh, S.W.Xu, H.Yamaguchi, D.Kahl, S.Kubono, P.Mohr, J.Hu, P.Ma, S.Z.Chen, Y.Wakabayashi, H.W.Wang, W.D.Tian, R.F.Chen, B.Guo, T.Hashimoto, Y.Togano, S.Hayakawa, T.Teranishi, N.Iwasa, T.Yamada, T.Komatsubara, Y.H.Zhang, X.H.Zhou

      Physical Review C89 ( 1 ) 015804   2014年1月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Physical Society  

      DOI: 10.1103/PhysRevC.89.015804

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    • Astrophysics Studies Relevant to Stellar X-Ray Bursts 査読有り

      J. J. He, J. Hu, L. Y. Zhang, S. W. Xu, A. Parikh, H. Yamaguchi, D. Kahl, P. Ma, S. Z. Chen, J. Su, Y. Wakabayashi, Y. Togano, S. Hayakawa, H. W. Wang, W. D. Tian, R. F. Chen, B. Guo, T. Nakao, T. Teranishi, J. Y. Moon, H. S. Jung, T. Hashimoto, A. A. Chen, D. Irvine, K. I. Hahn, N. Iwasa, T. Yamada, T. Komatsubara, C. S. Lee, S. Kubono

      ORIGIN OF MATTER AND EVOLUTION OF GALAXIES 20131594   176 - 183   2014年

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

      Two reactions of O-14(alpha,p)(17) F and Ne-18(alpha,p)Na-21 provide the pathways for breakout from the hot CNO cycles to the rp-process in type I X-ray bursts. To better determine their astrophysical reaction rates, resonance parameters of the compound nuclei I8Ne and 22Mg have been investigated by the resonant elastic scattering of F-17+p and Na-21+p, respectively. The F-17+p and Na-21+p radioactive ion beams were produced at the CNS Radioactive Ion Beam Separator and impinged on the thick proton targets. The excitation functions were obtained with a thick-target method over a wide excitation energy range. The resonance parameters in the compound nuclei Ne-18 and Mg-22 have been determined through an R-matrix analysis. New reaction rates of these two (alpha,p) reactions are recalculated. The astrophysical impact for the Ne-18(alpha,p)Na-21 reaction has been investigated through one-zone postprocessing X-ray burst calculations.

      DOI: 10.1063/1.4874064

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    • Ground-state configuration of neutron-rich Aluminum isotopes through Coulomb Breakup 査読有り

      S. Chakraborty, U. Datta Pramanik, T. Aumann, S. Beceiro, K. Boretzky, C. Caesar, B. V. Carlson, W. N. Catford, S. Chatterjee, M. Chartier, D. Cortina-Gil, G. De Angelis, D. Gonzalez-Diaz, H. Emling, P. Diaz Fernandez, L. M. Fraile, O. Ershova, H. Geissel, M. Heil, B. Jonson, A. Kelic, H. Johansson, R. Kruecken, T. Kroll, J. Kurcewicz, C. Langer, T. Le Bleis, Y. Leifels, G. Munzenberg, J. Marganiec, C. Nociforo, A. Najafi, V. Panin, S. Paschalis, S. Pietri, R. Plag, A. Rahaman, R. Reifarth, V. Ricciardi, D. Rossi, J. Ray, H. Simon, C. Scheidenberger, S. Typel, J. Taylor, Y. Togano, V. Volkov, H. Weick, A. Wagner, F. Wamers, M. Weigand, J. S. Winfield, D. Yakorev, M. Zori

      INPC 2013 - INTERNATIONAL NUCLEAR PHYSICS CONFERENCE, VOL. 166   2014年

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:E D P SCIENCES  

      Neutron-rich Al-34,Al-35 isotopes have been studied through Coulomb excitation using LAND-FRS setup at GSI, Darmstadt. The method of invariant mass analysis has been used to reconstruct the excitation energy of the nucleus prior to decay. Comparison of experimental CD cross-section with direct breakup model calculation with neutron in p(3/2) orbital favours Al-34(g.s)circle times v(p3/2) as ground state configuration of Al-35. But ground state configuration of Al-34 is complicated as evident from gamma-ray spectra of Al-33 after Coulomb breakup of Al-34.

      DOI: 10.1051/epjconf/20146602019

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    • In-beam gamma-ray spectroscopy of Si-38,Si-40,Si-42 査読有り

      M. Matsushita, S. Takeuchi, N. Aoi, P. Doornenbal, J. Lee, K. Li, T. Motobayashi, H. Scheit, D. Steppenbeck, H. Wang, H. Baba, D. Bazin, L. Caceres, H. Crawford, P. Fallon, R. Gernhaeuser, J. Gibelin, S. Go, S. Grevy, C. Hinke, C. R. Hoffman, R. Hughes, E. Ideguchi, K. Ieki, D. Jenkins, N. Kobayashi, Y. Kondo, R. Kruecken, T. Le Bleis, G. Lee, A. Matta, S. Michimasa, T. Nakamura, S. Ota, M. Petri, T. Sako, H. Sakurai, S. Shimoura, K. Steiger, K. Takahashi, M. Takechi, Y. Togano, R. Winkler, K. Yoneda

      INPC 2013 - INTERNATIONAL NUCLEAR PHYSICS CONFERENCE, VOL. 166   2014年

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:E D P SCIENCES  

      Excited states in the nuclei Si-38,Si-40,Si-42 have been studied using in-beam gamma-ray spectroscopy following multi-nucleon removal reactions to investigate the systematics of excitation energies along the Z = 14 isotopic chain. The most probable candidates for the transition from the yrast 4(+) state were tentatively assigned among several gamma lines newly observed in the present study. The energy ratios between the 2(1)(+) and 4(1)(+) states were obtained to be 2.09(5), 2.56(5) and 2.93(5) for Si-38,Si-40,Si-42, respectively, indicating a rapid development of deformation in Si isotopes from N = 24 to, at least, N = 28.

      DOI: 10.1051/epjconf/20146602070

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    • In-beam γ -ray spectroscopy of <sup>38,40,42</sup>Si 査読有り

      M. Matsushita, S. Takeuchi, N. Aoi, P. Doornenbal, J. Lee, K. Li, T. Motobayashi, H. Scheit, D. Steppenbeck, H. Wang, H. Baba, D. Bazin, L. Càceres, H. Crawford, P. Fallon, R. Gernhäuser, J. Gibelin, S. Go, S. Grévy, C. Hinke, C. R. Hoffman, R. Hughes, E. Ideguchi, K. Ieki, D. Jenkins, N. Kobayashi, Y. Kondo, R. Krücken, T. Le Bleis, G. Lee, A. Matta, S. Michimasa, T. Nakamura, S. Ota, M. Petri, T. Sako, H. Sakurai, S. Shimoura, K. Steiger, K. Takahashi, M. Takechi, Y. Togano, R. Winkler, K. Yoneda

      EPJ Web of Conferences66   2014年

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      掲載種別:研究論文(国際会議プロシーディングス)  

      Excited states in the nuclei 38,40,42 Si have been studied using in-beam Γ-ray spectroscopy following multi-nucleon removal reactions to investigate the systematics of excitation energies along the Z=14 isotopic chain. The most probable candidates for the transition from the yrast 4 + state were tentatively assigned among several γ lines newly observed in the present study. The energy ratios between the 21+ and 41+ states were obtained to be 2.09(5), 2.56(5) and 2.93(5) for 38,40,42Si, respectively, indicating a rapid development of deformation in Si isotopes from N=24 to, at least, N=28. © Owned by the authors, published by EDP Sciences, 2014.

      DOI: 10.1051/epjconf/20146602070

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    • Neutron occupancy of 0 d <inf>5/2</inf> orbital in <sup>24</sup>O 査読有り

      K. Tshoo, Y. Satou, H. Bhang, S. Choi, T. Nakamura, Y. Kondo, S. Deguchi, Y. Kawada, N. Kobayashi, Y. Nakayama, K. N. Tanaka, N. Tanaka, Y. Togano, N. Aoi, M. Ishihara, T. Motobayashi, H. Otsu, H. Sakurai, S. Takeuchi, K. Yoneda, F. Delaunay, J. Gibelin, F. M. Marqués, N. A. Orr, T. Honda, M. Matsushita, T. Kobayashi, Y. Miyashita, T. Sumikama, K. Yoshinaga, S. Shimoura, D. Sohler, T. Zheng, Z. X. Cao, Z. H. Li

      EPJ Web of Conferences66   2014年

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      掲載種別:研究論文(国際会議プロシーディングス)  

      The partial one-neutron removal cross section of 24O leading to the first excited state in 23O has been measured to be 65.7 ± 5.3 mb with a proton target in inverse kinematics at the beam energy of 62 MeV/nucleon. The decay energy spectrum of the neutron unbound state of 23O was reconstructed from the measured four momenta of 22O and the emitted neutron. A sharp peak was observed at E decay = 48 ± 3 keV, confirming the previous measurements. The measured partial longitudinal momentum distribution of 23O * showed the d-wave knockout character, providing a support for the Jπ assignment of 5/2+ for this state. The spectroscopic factor for the neutrons in 0d5/2 orbital was deduced, for the first time, to be C2S(0d5/2) = 3.7 ± 0.3 (preliminary) by comparing with the result of Glauber model. The relatively large spectroscopic factor supports the N = 16 shell closure in the neutron drip-line nucleus 24O. © Owned by the authors, published by EDP Sciences, 2014.

      DOI: 10.1051/epjconf/20146602103

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    • Neutron occupancy of 0d(5/2) orbital in O-24 査読有り

      K. Tshoo, Y. Satou, H. Bhang, S. Choi, T. Nakamura, Y. Kondo, S. Deguchi, Y. Kawada, N. Kobayashi, Y. Nakayama, K. N. Tanaka, N. Tanaka, Y. Togano, N. Aoi, M. Ishihara, T. Motobayashi, H. Otsu, H. Sakurai, S. Takeuchi, K. Yoneda, F. Delaunay, J. Gibelin, F. M. Marques, N. A. Orr, T. Honda, M. Matsushita, T. Kobayashi, Y. Miyashita, T. Sumikama, K. Yoshinaga, S. Shimoura, D. Sohler, T. Zheng, Z. X. Cao, Z. H. Li

      INPC 2013 - INTERNATIONAL NUCLEAR PHYSICS CONFERENCE, VOL. 166   2014年

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:E D P SCIENCES  

      The partial one-neutron removal cross section of O-24 leading to the first excited state in O-23 has been measured to be 65.7 +/- 5.3 mb with a proton target in inverse kinematics at the beam energy of 62 MeV/nucleon. The decay energy spectrum of the neutron unbound state of O-23 was reconstructed from the measured four momenta of O-22 and the emitted neutron. A sharp peak was observed at E-decay = 48 +/- 3 keV, confirming the previous measurements. The measured partial longitudinal momentum distribution of O-23* showed the d-wave knockout character, providing a support for the J(pi) assignment of 5/2(+) for this state. The spectroscopic factor for the neutrons in 0d(5/2) orbital was deduced, for the first time, to be (CS)-S-2 (0d(5/2)) = 3.7 +/- 0.3 (preliminary) by comparing with the result of Glauber model. The relatively large spectroscopic factor supports the N = 16 shell closure in the neutron drip-line nucleus O-24.

      DOI: 10.1051/epjconf/20146602103

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    • Study of Ground State Wave-function of the Neutron-rich Na-29,Na-30 Isotopes through Coulomb Breakup 査読有り

      A. Rahaman, U. Datta Pramanik, T. Aumann, S. Beceiro, K. Boretzky, C. Caesar, B. V. Carlson, W. N. Catford, S. Chakraborty, S. Chatterjee, M. Chartier, G. De Angelis, D. Cortina-Gil, D. Gonzalez-Diaz, H. Emling, P. Diaz Fernandez, L. M. Fraile, O. Ershova, H. Geissel, M. Heil, B. Jonson, A. Kelic, H. Johansson, R. Kruecken, T. Kroll, J. Kurcewicz, C. Langer, T. Le Bleis, Y. Leifels, G. Munzenberg, J. Marganiec, C. Nociforo, A. Najafi, V. Panin, S. Paschalis, S. Pietri, R. Plag, R. Reifarth, V. Ricciardi, D. Rossi, J. Ray, H. Simon, C. Scheidenberger, S. Typel, J. Taylor, Y. Togano, V. Volkov, H. Weick, A. Wagner, F. Wamers, M. Weigand, J. S. Winfield, D. Yakorev, M. Zoric

      INPC 2013 - INTERNATIONAL NUCLEAR PHYSICS CONFERENCE, VOL. 166   2014年

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:E D P SCIENCES  

      Coulomb breakup of unstable neutron rich nuclei Na-29,Na-30 around the 'island of inversion' has been studied at energy around 434 MeV/nucleon and 409 MeV/nucleon respectively. Four momentum vectors of fragments, decay neutron from excited projectile and gamma-rays emitted from excited fragments after Coulomb breakup are measured in coincidence. For these nuclei, the low-lying dipole strength above one neutron threshold can be explained by direct breakup model. The analysis for Coulomb breakup of Na-29,Na-30 shows that large amount of the cross section yields the Na-28, Na-29 core in ground state. The predominant ground-state configuration of Na-29,Na-30 is found to be Na-28(g.s)circle times V-s1/ 2 and 29Na(g.s)circle times(s1/ 2), respectively.

      DOI: 10.1051/epjconf/20146602087

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    • Collectivity evolution in the neutron-rich Pd isotopes toward the N=82 shell closure 査読有り

      H. Wang, N. Aoi, S. Takeuchi, M. Matsushita, P. Doornenbal, T. Motobayashi, D. Steppenbeck, K. Yoneda, H. Baba, L. Caceres, Zs. Dombradi, K. Kobayashi, Y. Kondo, J. Lee, K. Li, H. Liu, R. Minakata, D. Nishimura, H. Otsu, S. Sakaguchi, H. Sakurai, H. Scheit, D. Sohler, Y. Sun, Z. Tian, R. Tanaka, Y. Togano, Zs. Vajta, Z. Yang, T. Yamamoto, Y. Ye, R. Yokoyama

      PHYSICAL REVIEW C88 ( 5 ) 054318   2013年11月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      The neutron-rich, even-even Pd-122,Pd-124,Pd-126 isotopes were studied via in-beam gamma-ray spectroscopy at the RIKEN Radioactive Isotope Beam Factory. Excited states at 499(9), 590(11), and 686(17) keV were found in the three isotopes, which we assign to the respective 2(1)(+) -&gt; 0(gs)(+) decays. In addition, candidates for the 4(1)(+) states at 1164(20) and 1300(22) keV were observed in Pd-122 and Pd-124, respectively. The resulting E-x(2(1)(+)) systematics are similar to the Xe (Z = 54) isotopic chain and theoretical predictions by the proton-neutron interacting boson model (IBM-2), indicating the magic nature of N = 82 in the Pd isotopes.

      DOI: 10.1103/PhysRevC.88.054318

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    • In-Beam γ-Ray Spectroscopy of 34, 36, 38Mg: Merging the N=20 and N=28 Shell Quenching 査読有り

      P.Doornenbal, H.Scheit, S.Takeuchi, N.Aoi, K.Li, M.Matsushita, D.Steppenbeck, H.Wang, H.Baba, H.Crawford, C.R.Hoffman, R.Hughes, E.Ideguchi, N.Kobayashi, Y. Kondo, J.Lee, S.Michimasa, T.Motobayashi, H.Sakurai, M.Takechi, Y.Togano, R.Winkler, K.Yoneda

      Physical Review Letters111 ( 21 ) 212502   2013年11月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Physical Society  

      DOI: 10.1103/PhysRevLett.111.212502

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    • Beyond the neutron drip line: The unbound oxygen isotopes O-25 and O-26 査読有り

      C. Caesar, J. Simonis, T. Adachi, Y. Aksyutina, J. Alcantara, S. Altstadt, H. Alvarez-Pol, N. Ashwood, T. Aumann, V. Avdeichikov, M. Barr, S. Beceiro, D. Bemmerer, J. Benlliure, C. A. Bertulani, K. Boretzky, M. J. G. Borge, G. Burgunder, M. Caamano, E. Casarejos, W. Catford, J. Cederkaell, S. Chakraborty, M. Chartier, L. Chulkov, D. Cortina-Gil, U. Datta Pramanik, P. Diaz Fernandez, I. Dillmann, Z. Elekes, J. Enders, O. Ershova, A. Estrade, F. Farinon, L. M. Fraile, M. Freer, M. Freudenberger, H. O. U. Fynbo, D. Galaviz, H. Geissel, R. Gernhaeuser, P. Golubev, D. Gonzalez Diaz, J. Hagdahl, T. Heftrich, M. Heil, M. Heine, A. Heinz, A. Henriques, M. Holl, J. D. Holt, G. Ickert, A. Ignatov, B. Jakobsson, H. T. Johansson, B. Jonson, N. Kalantar-Nayestanaki, R. Kanungo, A. Kelic-Heil, R. Knoebel, T. Kroell, R. Kruecken, J. Kurcewicz, M. Labiche, C. Langer, T. Le Bleis, R. Lemmon, O. Lepyoshkina, S. Lindberg, J. Machado, J. Marganiec, V. Maroussov, J. Menendez, M. Mostazo, A. Movsesyan, A. Najafi, T. Nilsson, C. Nociforo, V. Panin, A. Perea, S. Pietri, R. Plag, A. Prochazka, A. Rahaman, G. Rastrepina, R. Reifarth, G. Ribeiro, M. V. Ricciardi, C. Rigollet, K. Riisager, M. Roeder, D. Rossi, J. Sanchez del Rio, D. Savran, H. Scheit, A. Schwenk, H. Simon, O. Sorlin, V. Stoica, B. Streicher, J. Taylor, O. Tengblad, S. Terashima, R. Thies, Y. Togano, E. Uberseder, J. Van de Walle, P. Velho, V. Volkov, A. Wagner, F. Wamers, H. Weick, M. Weigand, C. Wheldon, G. Wilson, C. Wimmer, J. S. Winfield, P. Woods, D. Yakorev, M. V. Zhukov, A. Zilges, M. Zoric, K. Zuber

      PHYSICAL REVIEW C88 ( 3 )   2013年9月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      The very neutron-rich oxygen isotopes O-25 and O-26 are investigated experimentally and theoretically. The unbound states are populated in an experiment performed at the R3B-LAND setup at GSI via proton-knockout reactions from F-26 and F-27 at relativistic energies around 442 and 414 MeV/nucleon, respectively. From the kinematically complete measurement of the decay into O-24 plus one or two neutrons, the O-25 ground-state energy and width are determined, and upper limits for the O-26 ground-state energy and lifetime are extracted. In addition, the results provide indications for an excited state in O-26 at around 4 MeV. The experimental findings are compared to theoretical shell-model calculations based on chiral two- and three-nucleon (3N) forces, including for the first time residual 3N forces, which are shown to be amplified as valence neutrons are added.

      DOI: 10.1103/PhysRevC.88.034313

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    • Breakup Reactions of Drip-Line Nuclei Near N = 20, 28 査読有り

      N. Kobayashi, T. Nakamura, Y. Kondo, N. Aoi, H. Baba, S. Deguchi, N. Fukuda, G. S. Lee, H. S. Lee, N. Inabe, M. Ishihara, Y. Kawada, R. Kanungo, T. Kubo, M. A. Famiano, M. Matsushita, T. Motobayashi, T. Ohnishi, N. A. Orr, H. Otsu, R. Barthelemy, H. Sakurai, S. Kim, T. Sako, T. Sumikama, Y. Satou, K. Takahashi, H. Takeda, M. Takechi, S. Takeuchi, K. N. Tanaka, N. Tanaka, R. Tanaka, Y. Togano, K. Yoneda

      Few-Body Systems54 ( 7-10 ) 1441 - 1444   2013年8月

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      掲載種別:研究論文(学術雑誌)  

      The one-neutron removal cross section from 29Ne, 33,35,37Mg, and 39,41Si on a Pb target have been measured at around 240 MeV/nucleon at the RIBF (RI-Beam Factory) at RIKEN. This main goal of the experiment was to extract the inclusive Coulomb breakup cross sections in order to probe possible halo structures through their enhanced low-energy E1 strengths - so-called soft E1 excitations. The results showed significant enhancement of the one-neutron removal Coulomb breakup cross section for 37Mg. This in turn provides evidence for the existence of halo structure in 37Mg. © 2013 Springer-Verlag Wien.

      DOI: 10.1007/s00601-013-0699-9

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    • Collectivity of neutron-rich Ti isotopes 査読有り

      H. Suzuki, N. Aoi, E. Takeshita, S. Takeuchi, S. Ota, H. Baba, S. Bishop, T. Fukui, Y. Hashimoto, E. Ideguchi, K. Ieki, N. Imai, M. Ishihara, H. Iwasaki, S. Kanno, Y. Kondo, T. Kubo, K. Kurita, K. Kusaka, T. Minemura, T. Motobayashi, T. Nakabayashi, T. Nakamura, T. Nakao, M. Niikura, T. Okumura, T. K. Ohnishi, H. J. Ong, H. Sakurai, S. Shimoura, R. Sugo, D. Suzuki, M. K. Suzuki, M. Tamaki, K. Tanaka, Y. Togano, K. Yamada

      PHYSICAL REVIEW C88 ( 2 ) 024326   2013年8月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      The structure of the neutron-rich nucleus Ti-58 was investigated via proton inelastic scattering in inverse kinematics at a mean energy of 42.0 MeV/nucleon. By measuring the deexcitation gamma rays, three transitions with the energies of 1046(11) keV, 1376(18) keV, and 1835(27) keV were identified. The angle-integrated cross section for the 1046-keV excitation, which corresponds to the decay from the first 2(+) state, was determined to be 13(7) mb. The deformation length delta(p,p') was extracted from the cross section to be 0.83(-0.30)(+0.22) fm. The energy of the first 2(+) state and the delta(p,p') value are comparable to the ones of Ti-56, which indicates that the collectivity of the Ti isotopes does not increase significantly with neutron number until N = 36. This fact indicates that Ti-58 is outside of the region of the deformation known in the neutron-rich nuclei around N = 40.

      DOI: 10.1103/PhysRevC.88.024326

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    • Proton Elastic Scattering of23,25F 査読有り

      R. J. Chen, H. Otsu, V. Lapoux, S. Boissinot, H. Baba, A. Matta, M. Kurata-Nishimura, E. Pollacco, Y. Blumenfeld, F. Flavigny, S. Franchoo, N. Fukuda, P. Gangnant, F. Hammache, C. Houarner, N. Inabe, D. Kameda, J. F. Libin, C. Louchart, M. Matsushita, T. Motobayashi, L. Nalpas, E. Y. Nikolskii, A. Obertelli, T. Onishi, E. Rindel, P. Rosier, H. Sakurai, F. Saillant, M. Takechi, S. Takeuchi, Y. Togano, K. Yoneda, A. Yoshida, K. Yoshida

      Few-Body Systems54 ( 7-10 ) 1405 - 1407   2013年8月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)  

      Proton elastic scatterings of neutron-rich nuclei 23F and 25F have been measured for the first time at 289 and 298 MeV/nucleon, respectively, using the MUST2 silicon strip detector array and RIBF facility at RIKEN. The differential cross section of 25F was found to be smaller than the calculation with the global potential by Koning and Deraloche. The small cross section of 25F can be well reproduced by an optical model calculation with a shallow and long-tail potential. © 2013 Springer-Verlag Wien.

      DOI: 10.1007/s00601-013-0612-6

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    • The 18Ne(α, p)21Na breakout reaction in x-ray bursts: Experimental determination of spin-parities for α resonances in 22Mg via resonant elastic scattering of 21Na+p 査読有り

      J.J.He, L.Y.Zhang, A.Parikh, S.W.Xu, H.Yamaguchi, D.Kahl, S.Kubono, J.Hu, P.Ma, S.Z.Chen, Y.Wakabayashi, B.H.Sun, H.W.Wang, W.D.Tian, R.F.Chen, B.Guo, T.Hashimoto, Y.Togano, S.Hayakawa, T.Teranishi, N.Iwasa, T.Yamada, T.Komatsubara

      Physical Review C88 ( 1 ) 012801   2013年7月29日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Physical Society  

      DOI: 10.1103/PhysRevC.88.012801

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    • HINDERED PROTON COLLECTIVITY IN THE PROTON-RICH NUCLEUS S-28: POSSIBLE MAGIC NUMBER AT Z=16 査読有り

      Y. Togano, Y. Yamada, N. Iwasa, K. Yamada, T. Motobayashi

      ACTA PHYSICA POLONICA B44 ( 3 ) 475 - 478   2013年3月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WYDAWNICTWO UNIWERSYTETU JAGIELLONSKIEGO  

      The reduced transition probability B (E-2; 0(gs)(+) -&gt; 2(1)(+)) for the proton-rich nucleus S-28 was determined experimentally using Coulomb excitation at 53 MeV/nucleon. The resultant B (E2) value is smaller than those of neighboring N = 12 isotones and Z = 16 isotopes. The ratio of neutron/proton transition matrix amplitudes for the 0(gs)(+) -&gt; 2(1)(+) transition were obtained to be 1.9(2) x N/Z from the present result and known B(E2) value in the mirror nucleus Mg-28. These results indicate the emergence of the magic number Z = 16 in S-28. DOI:10.5506/APhysPolB.44.475

      DOI: 10.5506/APhysPolB.44.475

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    • ELASTIC SCATTERING OF He-6 FROM PROTON AND CARBON TARGETS AT 82.3 MeV/NUCLEON 査読有り

      Lou J. L, Ye Y. L, Pang D. Y, Cao Z. X, Jiang D. X, Zheng T, Hua H, Li Z. H, Li X. Q, Ge Y. C, Lv L. H, Xiao J, Li Q. T, Qiao R, You H. B, Chen R. J, Sakurai H, Otsu H, Nishimura M, Sakaguchi S, Baba H, Togano Y, Yoneda K, Li C, Wang S, Wang H, Li K. A, Nakamura T, Nakayama Y, Kondo Y, Deguchi S, Satou Y, Tshoo K

      Nuclear Structure in China 2012   158 - 163   2013年

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    • UNBOUND STATES OF THE DRIP-LINE NUCLEUS O-24 査読有り

      Lapoux V, Boissinot S, Pollacco E. C, Flavigny F, Louchart C, Nalpas L, Obertelli A, Otsu H, Baba H, Chen R. J, Fukuda N, Inabe N, Kameda D, Matsushita M, Motobayashi T, Onishi T, Nikolskii E. Y, Nishimura M, Sakurai H, Takechi M, Takeuchi S, Togano Y, Yoneda K, Yoshida A, Yoshida K, Matta A, Blumenfeld Y, Franchoo S, Hammache F, Rosier P, Rindel E, Gangnant P, Houarner C, Libin J. F, Saillant F

      French-Japanese Symposium on Nuclear Structure Problems: Organized in the Framework of Fjnsp Lia and Efes   21 - 26   2013年

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    • One- and two-neutron removal reactions from the most neutron-rich carbon isotopes 査読有り

      N. Kobayashi, T. Nakamura, J. A. Tostevin, Y. Kondo, N. Aoi, H. Baba, S. Deguchi, J. Gibelin, M. Ishihara, Y. Kawada, T. Kubo, T. Motobayashi, T. Ohnishi, N. A. Orr, H. Otsu, H. Sakurai, Y. Satou, E. C. Simpson, T. Sumikama, H. Takeda, M. Takechi, S. Takeuchi, K. N. Tanaka, N. Tanaka, Y. Togano, K. Yoneda

      PHYSICAL REVIEW C86 ( 5 ) 054604   2012年11月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      The structure of C-19,C-20,C-22 has been investigated using high-energy (around 240 MeV/nucleon) one-and two-neutron removal reactions on a carbon target. Measurements were made of the inclusive cross sections and momentum distributions for the charged residues. Narrow momentum distributions were observed for one-neutron removal from C-19 and C-20 and two-neutron removal from C-22. Two-neutron removal from C-20 resulted in a relatively broad momentum distribution. The results are compared with eikonal-model calculations combined with shell-model structure information. The neutron removal cross sections and associated momentum distributions are calculated for transitions to both the particle-bound and particle-unbound final states. The calculations take into account the population of the mass A - 1 reaction residues CA-1 and, following one-neutron emission after one-neutron removal, the mass A - 2 two-neutron removal residues CA-2. The smaller contributions of direct two-neutron removal, that populate the CA-2 residues in a single step, are also computed. The data and calculations are shown to be in good overall agreement and consistent with the predicted shell-model ground-state configurations and one-neutron overlaps with low-lying states in C18-21. These suggest significant nu s(1/2)(2) valence neutron configurations in both C-20 and C-22. The results for C-22 strongly support the picture of C-22 as a two-neutron halo nucleus with a dominant nu s(1/2)(2) ground-state configuration.

      DOI: 10.1103/PhysRevC.86.054604

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    • Well Developed Deformation in Si-42 査読有り

      S. Takeuchi, M. Matsushita, N. Aoi, P. Doornenbal, K. Li, T. Motobayashi, H. Scheit, D. Steppenbeck, H. Wang, H. Baba, D. Bazin, L. Caceres, H. Crawford, P. Fallon, R. Gernhaeuser, J. Gibelin, S. Go, S. Grevy, C. Hinke, C. R. Hoffman, R. Hughes, E. Ideguchi, D. Jenkins, N. Kobayashi, Y. Kondo, R. Kruecken, T. Le Bleis, J. Lee, G. Lee, A. Matta, S. Michimasa, T. Nakamura, S. Ota, M. Petri, T. Sako, H. Sakurai, S. Shimoura, K. Steiger, K. Takahashi, M. Takechi, Y. Togano, R. Winkler, K. Yoneda

      PHYSICAL REVIEW LETTERS109 ( 18 ) 182501   2012年11月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      Excited states in Si-38,Si-40,Si-42 nuclei have been studied via in-beam gamma-ray spectroscopy with multinucleon removal reactions. Intense radioactive beams of S-40 and S-44 provided at the new facility of the RIKEN Radioactive Isotope Beam Factory enabled gamma-gamma coincidence measurements. A prominent gamma line observed with an energy of 742(8) keV in Si-42 confirms the 2(+) state reported in an earlier study. Among the gamma lines observed in coincidence with the 2(+) -&gt; 0(+) transition, the most probable candidate for the transition from the yrast 4(+) state was identified, leading to a 4(1)(+) energy of 2173(14) keV. The energy ratio of 2.93(5) between the 2(1)(+) and 4(1)(+) states indicates well-developed deformation in Si-42 at N = 28 and Z = 14. Also for Si-38,Si-40 energy ratios with values of 2.09(5) and 2.56(5) were obtained. Together with the ratio for Si-42, the results show a rapid deformation development of Si isotopes from N = 24 to N = 28.

      DOI: 10.1103/PhysRevLett.109.182501

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    • New measurements for 8He excited states 査読有り

      Jun Xiao, Yan-Lin Ye, Zhong-Xin Cao, Dong-Xing Jiang, Tao Zheng, Hui Hua, Zhi-Huan Li, Xiang-Qing Li, Yu-Cheng Ge, Jian-Ling Lou, Dan-Yang Pang, Lin-Hui Lv, Qi-Te Li, Rui Qiao, Hai-Bo You, Rui-Jiu Chen, H. Sakurai, H. Otsu, M. Nishimura, S. Sakaguchi, H. Baba, Y. Togano, K. Yoneda, Chen Li, Shuo Wang, He Wang, Kuo-Ang Li, Y. Nakayama, Y. Kondo, S. Deguchi, Y. Satou, K. H. Tshoo

      Chinese Physics Letters29 ( 8 )   2012年8月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)  

      Breakup reactions of the double borromean nucleus 8He were measured at 82.3 MeV/u on CH 2 and C targets. The coincident detection of two decaying neutrons and the high performance for neutron cross talk rejection are realized in this experiment. The relative energy spectrum for 8He was reconstructed with good statistics. The spectrum exhibits a structure of two resonant peaks, one at an excitation energy of about 3.0 and the other at about 4.14 MeV, respectively. Substantially larger cross section for the first resonance is observed in comparison to the results reported previously. © 2012 Chinese Physical Society and IOP Publishing Ltd.

      DOI: 10.1088/0256-307X/29/8/082501

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    • N=16 Spherical Shell Closure in O-24 査読有り

      K. Tshoo, Y. Satou, H. Bhang, S. Choi, T. Nakamura, Y. Kondo, S. Deguchi, Y. Kawada, N. Kobayashi, Y. Nakayama, K. N. Tanaka, N. Tanaka, N. Aoi, M. Ishihara, T. Motobayashi, H. Otsu, H. Sakurai, S. Takeuchi, Y. Togano, K. Yoneda, Z. H. Li, F. Delaunay, J. Gibelin, F. M. Marques, N. A. Orr, T. Honda, M. Matsushita, T. Kobayashi, Y. Miyashita, T. Sumikama, K. Yoshinaga, S. Shimoura, D. Sohler, T. Zheng, Z. X. Cao

      PHYSICAL REVIEW LETTERS109 ( 2 ) 022501   2012年7月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      The unbound excited states of the neutron drip-line isotope O-24 have been investigated via the O-24(p, p')O-23 + n reaction in inverse kinematics at a beam energy of 62 MeV/nucleon. The decay energy spectrum of O-24* was reconstructed from the momenta of O-23 and the neutron. The spin parity of the first excited state, observed at E-x = 4.65 +/- 0.14 MeV, was determined to be J(pi) = 2(+) from the angular distribution of the cross section. Higher-lying states were also observed. The quadrupole transition parameter beta(2) of the 2(1)(+) state was deduced, for the first time, to be 0.15 +/- 0.04. The relatively high excitation energy and small beta(2) value are indicative of the N = 16 shell closure in O-24.

      DOI: 10.1103/PhysRevLett.109.022501

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    • Knockout reaction induced by 6He at 82.3 MeV/u 査読有り

      L. H. Lv, J. Xiao, Y. L. Ye, Z. X. Cao, D. X. Jiang, T. Zheng, H. Hua, Z. H. Li, X. Q. Li, Y. C. Ge, J. L. Lou, R. Qiao, Q. T. Li, H. B. You, R. J. Chen, H. Sakurai, H. Otsu, M. Nishimura, S. Sakaguchi, H. Baba, Y. Togano, K. Yoneda, C. Li, S. Wang, H. Wang, K. A. Li, T. Nakamura, Y. Nakayama, Y. Kondo, S. Deguchi, Y. Satou, K. Tshoo

      Journal of Physics G: Nuclear and Particle Physics39 ( 6 )   2012年6月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)  

      A knockout reaction experiment was carried out using a 6He beam at 82.3 MeV/u impinged on carbon and hydrogen targets. The recoil protons were detected in coincidence with the forward moving charged fragments and neutrons. It is demonstrated that through the correlation between the recoil protons and forward moving charged fragments, the core fragment knockout and valence nucleon knockout reaction mechanisms can be discriminated at energies around 100 MeV/u. The 5He ground-state resonance was reconstructed based on the selection of the valence nucleon knockout mechanism. The resonance parameters were obtained for both carbon and hydrogen targets, which are consistent with those previously reported in the literature. The importance of selecting appropriate reaction mechanisms is discussed based on reconstructions using events with larger transverse momentum transfer. © 2012 IOP Publishing Ltd.

      DOI: 10.1088/0954-3899/39/6/065102

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    • Hindered Proton Collectivity in S-28(16)12: Possible Magic Number at Z=16 査読有り

      Y. Togano, Y. Yamada, N. Iwasa, K. Yamada, T. Motobayashi, N. Aoi, H. Baba, S. Bishop, X. Cai, P. Doornenbal, D. Fang, T. Furukawa, K. Ieki, T. Kawabata, S. Kanno, N. Kobayashi, Y. Kondo, T. Kuboki, N. Kume, K. Kurita, M. Kurokawa, Y. G. Ma, Y. Matsuo, H. Murakami, M. Matsushita, T. Nakamura, K. Okada, S. Ota, Y. Satou, S. Shimoura, R. Shioda, K. N. Tanaka, S. Takeuchi, W. Tian, H. Wang, J. Wang, K. Yoneda

      PHYSICAL REVIEW LETTERS108 ( 21 ) 222501   2012年5月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      The reduced transition probability B(E2; 0(gs)(+) -&gt; 2(1)(+)) for S-28 was obtained experimentally using Coulomb excitation at 53 MeV/nucleon. The resultant B(E2) value 181(31) e(2)fm(4) is smaller than the expectation based on empirical B(E2) systematics. The double ratio vertical bar M-n/M-p vertical bar/(N/Z) of the 0(gs)(+) -&gt; 2(1)(+) transition in S-28 was determined to be 1.9(2) by evaluating the M-n value from the known B(E2) value of the mirror nucleus Mg-28, showing the hindrance of proton collectivity relative to that of neutrons. These results indicate the emergence of the magic number Z = 16 in the vertical bar T-z vertical bar = 2 nucleus S-28.

      DOI: 10.1103/PhysRevLett.108.222501

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    • Experimental study of resonant states in P-27 via elastic scattering of Si-26+p 査読有り

      H. S. Jung, C. S. Lee, Y. K. Kwon, J. Y. Moon, J. H. Lee, C. C. Yun, S. Kubono, H. Yamaguchi, T. Hashimoto, D. Kahl, S. Hayakawa, Seonho Choi, M. J. Kim, Y. H. Kim, Y. K. Kim, J. S. Park, E. J. Kim, C. -B. Moon, T. Teranishi, Y. Wakabayashi, N. Iwasa, T. Yamada, Y. Togano, S. Kato, S. Cherubini, G. G. Rapisarda

      PHYSICAL REVIEW C85 ( 4 ) 045802   2012年4月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      Proton resonant states in P-27 were studied by the resonant elastic scattering of Si-26 + p with a Si-26 radioactive ion beam bombarding a thick H-2 gas target with the inverse kinematics method. The properties of these resonance states are important to better constrain the production rates of the Si-26( p, gamma)P-27 reaction. This is one of the astrophysically important reactions needed to understand proton-rich nucleosynthesis such as the galactic production of Al-26 and energy generation in explosive stellar environments. Although there are recent studies on the resonant structure in P-27, large uncertainties remain, and only a few levels are known. In this work, resonant states were observed over the excitation energies range of 2.3 to 3.8 MeV with high statistics and without background contamination within the target. The resonance parameters were extracted by an R-matrix analysis of the excitation function. The Si-26( p,gamma)P-27 stellar reaction rate has been evaluated, including high-lying resonances found in this work.

      DOI: 10.1103/PhysRevC.85.045802

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    • Recoil proton tagged knockout reaction for He-8 査読有り

      Z. X. Cao, Y. L. Ye, J. Xiao, L. H. Lv, D. X. Jiang, T. Zheng, H. Hua, Z. H. Li, X. Q. Li, Y. C. Ge, J. L. Lou, R. Qiao, Q. T. Li, H. B. You, R. J. Chen, D. Y. Pang, H. Sakurai, H. Otsu, M. Nishimura, S. Sakaguchi, H. Baba, Y. Togano, K. Yoneda, C. Li, S. Wang, H. Wang, K. A. Li, T. Nakamura, Y. Nakayama, Y. Kondo, S. Deguchi, Y. Satou, K. Tshoo

      PHYSICS LETTERS B707 ( 1 ) 46 - 51   2012年1月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

      We report for the first time the discrimination of the core fragment knockout and valence nucleon knockout reaction mechanisms at medium energy range, by the use of the recoil proton technique. Intense He-8 beams at 82.3 MeV/u were supplied by the RIPS beam line at RIKEN, and impinged on both hydrogen and carbon targets. Recoil protons were detected in coincidence with the forward moving core fragments and neutrons. The core fragment knockout mechanism is identified through the polar angle correlation and checked by various kinematics relations. This mechanism may be used to extract the cluster structure information of unstable nuclei. On the other hand, with the selection of the tagged valence nucleon knockout mechanism, a narrower peak of He-7 ground state is obtained. The extracted neutron spectroscopic factor S-n=0.512(18) is relatively smaller than the no-tagged one, and is in good agreement with the prediction of ab initio Green's function Monte Carlo calculations. (C) 2011 Elsevier B.V. All rights reserved.

      DOI: 10.1016/j.physletb.2011.12.009

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    • Strong Al-25 + p resonances via elastic proton scattering with a radioactive Al-25 beam 査読有り

      J. Chen, A. A. Chen, G. Amadio, S. Cherubini, H. Fujikawa, S. Hayakawa, J. J. He, N. Iwasa, D. Kahl, L. H. Khiem, S. Kubono, S. Kurihara, Y. K. Kwon, M. La Cognata, J. Y. Moon, M. Niikura, S. Nishimura, J. Pearson, R. G. Pizzone, T. Teranishi, Y. Togano, Y. Wakabayashi, H. Yamaguchi

      PHYSICAL REVIEW C85 ( 1 ) 015805   2012年1月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      Al-25 + p elastic scattering in inverse kinematics was measured to explore the level structure of Si-26 above its proton threshold. The H-2(Mg-24, n)Al-25 reaction was used to produce a 3.4 MeV/nucleon Al-25 radioactive beam with intensities of about 10(6) ions per second on target. By using a thick target of (CH2)(n), a center-of-mass energy range of 3 MeV was scanned, reaching up to about 8.5 MeV in excitation energy in Si-26. This energy range covered the region of importance for the Al-25( p, gamma) Si-26 at temperatures characteristic of explosive nucleosynthesis. Level parameters of six strong s-wave Al-25 + p resonances in Si-26 were extracted from fits to the measured excitation functions using the R-matrix formalism. Two new levels have been discovered, while for two others, our spin-parity assignments disagree with the results of some previous studies. Lastly, our resonance parameters for the remaining two levels are in good agreement with past experimental work, and with recent shell-model calculations.

      DOI: 10.1103/PhysRevC.85.015805

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    • Hindered proton collectivity in the proton-rich nucleus <sup>28</sup>S: Possible magic number Z = 16 査読有り

      Y. Togano, Y. Yamada, N. Iwasa, K. Yamada, T. Motobayashi, N. Aoi, H. Baba, S. Bishop, X. Cai, P. Doornenbal, D. Fang, T. Furukawa, K. Ieki, T. Kawabata, S. Kanno, N. Kobayashi, Y. Kondo, T. Kuboki, N. Kume, K. Kurita, M. Kurokawa, Y. G. Ma, Y. Matsuo, H. Murakami, M. Matsushita, T. Nakamura, K. Okada, S. Ota, Y. Satou, S. Shimoura, R. Shioda, K. N. Tanaka, S. Takeuchi, W. Tian, H. Wang, J. Wang, K. Yoneda

      AIP Conference Proceedings1491   71 - 74   2012年

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      掲載種別:研究論文(国際会議プロシーディングス)  

      The reduced transition probability B(E2;0gs+→ 21+) for the proton-rich nucleus 28S was determined experimentally using intermediate-energy Coulomb excitation. The resultant B(E2) value 181(31) e2fm4 is smaller than those of neighboring N = 12 isotones and Z = 16 isotopes. The double ratio |M n/Mp|/(N/Z) of the 0gs+→2 1+ transition in 28S was obtained to be 1.9(2) by evaluating the Mn value from the known B(E2) value of the mirror nucleus 28Mg, showing the hindrance of proton collectivity relative to that of neutrons. These results indicate the emergence of the magic number Z = 16 in 28S. © 2012 American Institute of Physics.

      DOI: 10.1063/1.4764205

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    • Measurement of Al-25+p resonant elastic scattering for studying the Al-25(p,gamma)Si-26 査読有り

      Y. K. Kwon, C. S. Lee, H. S. Jung, J. Y. Moon, J. H. Lee, C. C. Yun, S. Kubono, H. Yamaguchi, T. Hashimoto, D. Kahl, S. Hayakawa, Seonho Choi, M. J. Kim, Y. H. Kim, Y. K. Kim, J. S. Park, E. J. Kim, C. -B. Moon, T. Teranishi, Y. Wakabayashi, N. Iwasa, T. Yamada, Y. Togano, S. Kato, S. Cherubini, G. G. Rapisarda

      ORIGIN OF MATTER AND EVOLUTION OF GALAXIES 20111484   365 - 368   2012年

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

      Proton resonant states in Si-26 have been studied by the resonant elastic scattering of Al-25+p with a Al-25 radioactive ion beam at 2.863 MeV/nucleon bombarding a thick H-2 gas target with the inverse kinematics method at the low-energy RI beam facility CRIB (CNS Radioactive Ion Beam separator), University of Tokyo. The properties of these resonance states are important to better determine the production rates of Al-25(p, gamma)Si-26 reaction, which is one of the astrophysically important nuclear reactions to understand the production of the ground state of Al-26, the emitter of its characteristic 1.809-MeV gamma-ray, under the explosive stellar environments such as novae and X-ray bursts. In this work, several resonances above the proton threshold level have been observed with a high statistics and background free through a covered the range of excitation energies from E-x similar to 6.8 to 8.2 MeV.

      DOI: 10.1063/1.4763422

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    • Spectroscopy of the unbound states of the drip-line nucleus 24o 査読有り

      Valerie Lapoux, Simon Boissinot, Hideaki Otsu, H. Baba, R. J. Chen, A. Matta, E. Pollacco, Y. Blumenfeld, F. Flavigny, S. Franchoo, N. Fukuda, P. Gangnant, F. Hammache, Ch Houarner, N. Inabe, D. Kameda, J. F. Libin, C. Louchart, M. Matsushita, T. Motobayashi, L. Nalpas, E. Yu Nikolskii, M. Nishimura, A. Obertelli, T. Onishi, E. Rindel, Ph Rosier, H. Sakurai, F. Saillant, M. Takechi, S. Takeuchi, Y. Togano, K. Yoneda, A. Yoshida, K. Yoshida

      Progress of Theoretical Physics Supplement ( 196 ) 111 - 116   2012年

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:Yukawa Institute for Theoretical Physics  

      The drip-line 24O nucleus combines several properties which are challenging our understanding of the nuclear structure: it has no bound excited state, and is expected as a neutron-skin nucleus with low-lying resonances. It presents a new shell gap effect at N = 16. To investigate the neutron excitations and the characteristics of this gap, the proton elastic and inelastic scattering by 24O were measured, using the light charged particle spectroscopy technique
      the excitation energies of the unbound states were deduced via missing mass method. The experiment was carried out at the RIBF facility in the BigRIPS line, combining the unique intensities of the 24O beam with the state-of-the-art Si-telescope array MUST2. The analysis and the preliminary results are discussed.

      DOI: 10.1143/PTPS.196.111

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    • Study of Proton Resonance Structure in P-27 via Resonant Elastic Scattering of Si-26+p 査読有り

      H. S. Jung, C. S. Lee, Y. K. Kwon, J. Y. Moon, J. H. Lee, C. C. Yun, S. Kubono, H. Yamaguchi, T. Hashimoto, D. Kahl, S. Hayakawa, Seonho Choi, M. J. Kim, Y. H. Kim, Y. K. Kim, J. S. Park, E. J. Kim, C. -B. Moon, T. Teranishi, Y. Wakabayashi, N. Iwasai, T. Yamada, Y. Togano, S. Kato, S. Cherubini, G. G. Rapisarda

      ORIGIN OF MATTER AND EVOLUTION OF GALAXIES 20111484   307 - 312   2012年

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

      A measurement of resonant elastic scattering of Si-26+p was performed with a thick target using a Si-26 radioactive ion beam at the CRIB (CNS Radioactive Ion Beam separator) of the Center for Nuclear Study (CNS), the University of Tokyo. The excitation function of P-27 was measured successfully with the inverse kinematics method through a covered the range of excitation energies from E-x similar to 2.3 to 3.8 MeV, providing information about the resonance structure of this nucleus. The properties of these resonances are important to better determine the production rates of Si-26(p,g)P-27 reaction, which is one of the astrophysically important nuclear reactions to understand the production of the Al-26. Some new resonant states have been investigated, and determined their resonance parameters, such as excitation energies, proton partial widths, and spin-parities by R-matrix calculation.

      DOI: 10.1063/1.4763412

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    • Study of resonant scattering of Na-21+p relevant to astrophysical Ne-18(alpha, p)Na-21 reaction 査読有り

      J. J. He, L. Y. Zhang, S. W. Xu, S. Z. Chen, J. Hu, P. Ma, R. F. Chen, H. Yamaguchi, S. Kubono, T. Hashimoto, D. Kahl, S. Hayakawa, Y. Wakabayashi, Y. Togano, H. W. Wang, W. D. Tian, B. Guo, T. Teranishi, N. Iwasa, T. Yamada, T. Komatsubara

      ORIGIN OF MATTER AND EVOLUTION OF GALAXIES 20111484   240 - 245   2012年

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

      Astrophysical Ne-18(alpha, p)Na-21 reaction is one of the most probable breakout routes, which lead to the rp-process from the hot-CNO cycle, converting the initial CNO elements into heavier elements in Type I x-ray bursters. Presently, there is no much experimental cross-section data reported at the energy of astrophysical interest, and resonant spectroscopic information in compound Mg-22 is scarce as well. The experiment has been carried out by using the CNS radioactive ion beam separator (CRIB). Resonant properties in Mg-22 have been studied via the resonant elastic scattering of Na-21+p, and cross section of the time-reversal reaction of Na-21(p, alpha)Ne-18 been measured simultaneously. A wide excitation energy region up to E-x similar to 9.5 MeV in Mg-22 has been scanned with a thick-target method. Some preliminary results will be reported.

      DOI: 10.1063/1.4763401

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    • One- and two-neutron removal reactions from C-19,C-20 with a proton target 査読有り

      A. Ozawa, Y. Hashizume, Y. Aoki, K. Tanaka, T. Aiba, N. Aoi, H. Baba, B. A. Brown, M. Fukuda, K. Inafuku, N. Iwasa, T. Izumikawa, K. Kobayashi, M. Komuro, Y. Kondo, T. Kubo, M. Kurokawa, T. Matsuyama, S. Michimasa, T. Motobayashi, T. Nakabayashi, S. Nakajima, T. Nakamura, T. Ohtsubo, H. Sakurai, R. Shinoda, M. Shinohara, H. Suzuki, T. Suzuki, M. Takechi, E. Takeshita, S. Takeuchi, Y. Togano, K. Yamada, T. Yamaguchi, T. Yasuno, M. Yoshitake

      PHYSICAL REVIEW C84 ( 6 ) 064315   2011年12月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      One-and two-neutron removal reactions from C-19 and C-20 have been studied using a liquid-hydrogen target at 40A MeV. A small cross section has been observed in the one-neutron removal reaction from C-20. The observed inclusive removal cross sections are compared with theoretical removal cross sections calculated by using shell model spectroscopic factors and Glauber-model single-particle cross sections. The observed momentum distributions are also compared with those calculated by using continuum-discretized coupled-channel methods. Good consistency between theory and experiment is shown in the one-neutron removal reaction from C-19. However, our theoretical calculation fails to reproduce the neutron removal reactions from C-20, which suggests that further improvements of the theoretical descriptions are necessary.

      DOI: 10.1103/PhysRevC.84.064315

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    • Resonance states in 27P using Coulomb dissociation and their effect on the stellar reaction 26Si(p, γ) 27P 査読有り

      Y.Togano, T.Gomi, T.Motobayashi, Y.Ando, N.Aoi, H.Baba, K.Demichi, Z.Elekes, N.Fukuda, Zs.Fulop, U.Futakami, H.Hasegawa, Y.Higurashi, K.Ieki, N.Imai, M.Ishihara, K.Ishikawa, N.Iwasa, H.Iwasaki, S.Kanno, Y.Kondo, T.Kubo, S.Kubono, M.Kunibu, K.Kurita, Y.U.Matsuyama, S.Michimasa, T.Minemura, M.Miura, H.Murakami, T.Nakamura, M.Notani, S.Ota, A.Saito, H.Sakurai, M.Serata, S.Shimoura, T.Sugimoto, E.Takeshita, S.Takeuchi, K.Ue, K.Yamada, Y.Yanagisawa, K.Yoneda, A.Yoshida

      Physical Review C84 ( 3 ) 035808   2011年9月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Physical Society  

      DOI: 10.1103/PhysRevC.84.035808

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    • Measurements on diproton emission from the break-up channels of Al-23 and Mg-22 査読有り

      Ma YuGang, Fang DeQing, Sun XiaoYan, Zhou Pei, Cai XiangZhou, Chen JinGen, Guo Wei, Tian WenDong, Wang HongWei, Zhang GuoQiang, Cao XiGuang, Fu Yao, Hu ZhengGuo, Wang JianSong, Wang Meng, Y. Togano, N. Aoi, H. Baba, T. Honda, K. Okada, Y. Hara, K. Ieki, Y. Ishibashi, Y. Itou, N. Iwasa, S. Kanno, T. Kawabata, H. Kimura, Y. Kondo, K. Kurita, M. Kurokawa, T. Moriguchi, H. Murakami, H. Oishi, S. Ota, A. Ozawa, H. Sakurai, S. Shimoura, R. Shioda, E. Takeshita, S. Takeuchi, K. Yamada, Y. Yamada, Y. Yasuda, K. Yoneda, T. Motobayashi

      SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY54   S18 - S23   2011年8月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SCIENCE PRESS  

      Two-proton relative momentum distributions from the break-up channels Al-23 -&gt; p+p+Na-21 and Mg-22 -&gt; p+p+Ne-20 at an energy of 60-70 A MeV have been measured together with two-proton opening angles at the projectile fragment separator beamline (RIPS) in the RIKEN Ring Cyclotron Facility. The results demonstrate the existence of diproton emission component from single-step He-2 for highly excited Al-23 and Mg-22.

      DOI: 10.1007/s11433-011-4452-4

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    • Quasielastic scattering of He6 from C12 at 82.3 MeV/nucleon 査読有り

      J. L. Lou, Y. L. Ye, D. Y. Pang, Z. X. Cao, D. X. Jiang, T. Zheng, H. Hua, Z. H. Li, X. Q. Li, Y. C. Ge, L. H. Lv, J. Xiao, Q. T. Li, R. Qiao, H. B. You, R. J. Chen, H. Sakurai, H. Otsu, M. Nishimura, S. Sakaguchi, H. Baba, Y. Togano, K. Yoneda, C. Li, S. Wang, H. Wang, K. A. Li, T. Nakamura, Y. Nakayama, Y. Kondo, S. Deguchi, Y. Satou, K. Tshoo

      Physical Review C - Nuclear Physics83 ( 3 )   2011年3月23日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Physical Society  

      Quasielastic scattering of He6 on a C12 target was measured at 82.3 MeV/nucleon. Special care was taken to treat the background subtraction at very small angles. The measured differential cross-sections show a large enhancement at small angles relative to the Rutherford cross-section, similar to those observed at lower energies for the scattering of halo nuclei. The overall structure of the cross-section is reasonably reproduced by the optical model calculations. The inelastic channels which populate two low-lying excited states of C12 target nucleus were included in the framework of the coupled channel analysis. Further systematic theoretical analysis is encouraged. © 2011 American Physical Society.

      DOI: 10.1103/PhysRevC.83.034612

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    • Be-14(p, n)B-14 reaction at 69 MeV in inverse kinematics 査読有り

      Y. Satou, T. Nakamura, Y. Kondo, N. Matsui, Y. Hashimoto, T. Nakabayashi, T. Okumura, M. Shinohara, N. Fukuda, T. Sugimoto, H. Otsu, Y. Togano, T. Motobayashi, H. Sakurai, Y. Yanagisawa, N. Aoi, S. Takeuchi, T. Gomi, M. Ishihara, S. Kawai, H. J. Ong, T. K. Onishi, S. Shimoura, M. Tamaki, T. Kobayashi, Y. Matsuda, N. Endo, M. Kitayama

      PHYSICS LETTERS B697 ( 5 ) 459 - 462   2011年3月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

      A Gamow-Teller (GT) transition from the drip-line nucleus Be-14 to B-14 was studied via the (p, n) reaction in inverse kinematics using a secondary Be-14 beam at 69 MeV/nucleon. The invariant mass method is employed to reconstruct the energy spectrum. A peak is observed at an excitation energy of 1.27(2) MeV in B-14, together with bumps at 2.08 and 4.06(5) MeV. The observed forward peaking of the state at 1.27 MeV and a good description for the differential cross section, obtained with a DWBA calculation provide support for the 1(+) assignment to this state. By extrapolating the cross section to zero momentum transfer the GT-transition strength is deduced. The value is found to compare well with that reported in a beta-delayed neutron emission study. (C) 2011 Elsevier B.V. All rights reserved.

      DOI: 10.1016/j.physletb.2011.02.045

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    • Quasielastic scattering of He-6 from C-12 at 82.3 MeV/nucleon 査読有り

      J. L. Lou, Y. L. Ye, D. Y. Pang, Z. X. Cao, D. X. Jiang, T. Zheng, H. Hua, Z. H. Li, X. Q. Li, Y. C. Ge, L. H. Lv, J. Xiao, Q. T. Li, R. Qiao, H. B. You, R. J. Chen, H. Sakurai, H. Otsu, M. Nishimura, S. Sakaguchi, H. Baba, Y. Togano, K. Yoneda, C. Li, S. Wang, H. Wang, K. A. Li, T. Nakamura, Y. Nakayama, Y. Kondo, S. Deguchi, Y. Satou, K. Tshoo

      PHYSICAL REVIEW C83 ( 3 )   2011年3月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      Quasielastic scattering of He-6 on a C-12 target was measured at 82.3 MeV/nucleon. Special care was taken to treat the background subtraction at very small angles. The measured differential cross-sections show a large enhancement at small angles relative to the Rutherford cross-section, similar to those observed at lower energies for the scattering of halo nuclei. The overall structure of the cross-section is reasonably reproduced by the optical model calculations. The inelastic channels which populate two low-lying excited states of C-12 target nucleus were included in the framework of the coupled channel analysis. Further systematic theoretical analysis is encouraged.

      DOI: 10.1103/PhysRevC.83.034612

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    • Experimental Investigation of the Stellar Reaction S-30(p, gamma)Cl-31 via Coulomb Dissociation 査読有り

      Y. Togano, T. Motobayashi, N. Aoi, H. Baba, S. Bishop, X. Cai, P. Doornenbal, D. Fang, T. Furukawa, K. Ieki, N. Iwasa, T. Kawabata, S. Kanno, N. Kobayashi, Y. Kondo, T. Kuboki, N. Kume, K. Kurita, M. Kurokawa, Y. G. Ma, Y. Matsuo, H. Murakami, M. Matsushita, T. Nakamura, K. Okada, S. Ota, Y. Satou, S. Shimoura, R. Shioda, K. N. Tanaka, S. Takeuchi, W. Tian, H. Wang, J. Wang, K. Yamada, Y. Yamada, K. Yoneda

      INTERNATIONAL NUCLEAR PHYSICS CONFERENCE 2010 (INPC2010): NUCLEAR ASTROPHYSICS312   2011年

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IOP PUBLISHING LTD  

      Coulomb dissociation of the proton-rich nucleus Cl-31 was studied experimentally using a Cl-31 beam at 58 MeV/nucleon with a lead target. The relative energy spectrum of S-30+p system was obtained from the measured momentum vectors of the reaction products detected in coincidence by the invariant mass method. The first excited state in Cl-31 was observed which is relevant to the resonant capture in the stellar S-30(p, gamma)Cl-31 reaction. Discussion for another observed state is also given.

      DOI: 10.1088/1742-6596/312/4/042025

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    • Experimental investigation of the Stellar reaction <sup>30</sup>S(p, γ)<sup>31</sup>Cl via Coulomb dissociation 査読有り

      Y. Togano, T. Motobayashi, N. Aoi, H. Baba, S. Bishop, X. Cai, P. Doornenbal, D. Fang, T. Furukawa, K. Ieki, N. Iwasa, T. Kawabata, S. Kanno, N. Kobayashi, Y. Kondo, T. Kuboki, N. Kume, K. Kurita, M. Kurokawa, Y. G. Ma, Y. Matsuo, H. Murakami, M. Matsushita, T. Nakamura, K. Okada, S. Ota, Y. Satou, S. Shimoura, R. Shioda, K. N. Tanaka, S. Takeuchi, W. Tian, H. Wang, J. Wang, K. Yamada, Y. Yamada, K. Yoneda

      Journal of Physics: Conference Series312 ( SECTION 4 ) 1763 - 1766   2011年

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      掲載種別:研究論文(国際会議プロシーディングス)  

      Coulomb dissociation of the proton-rich nucleus 31Cl was studied experimentally using a 31Cl beam at 58 MeV/nucleon with a lead target. The relative energy spectrum of 30S+p system was obtained from the measured momentum vectors of the reaction products detected in coincidence by the invariant mass method. The first excited state in 31Cl was observed which is relevant to the resonant capture in the stellar 30S(p,γ)31Cl reaction. Discussion for another observed state is also given.

      DOI: 10.1088/1742-6596/312/4/042025

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    • SAMURAI project at RIBF

      Y. Shimizu, T. Kobayashi, T. Kubo, N. Chiga, T. Isobe, T. Kawabata, Y. Kondo, K. Kusaka, Y. Matsuda, T. Motobayashi, T. Murakami, T. Nakamura, J. Ohnishi, T. Ohnishi, H. Okuno, H. Otsu, H. Sakurai, H. Sato, Y. Satou, K. Sekiguchi, Y. Togano, K. Yoneda

      Journal of Physics: Conference Series312 ( 5 )   2011年

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:Institute of Physics Publishing  

      SAMURAI project aims to open a new research field in nuclear physics by the use of a large acceptance spectrometer for kinematically complete measurements of multiple particles emitted in RI-beam induced reactions. The SAMURAI spectrometer consists of a large gap superconducting dipole magnet, heavy ion detectors, neutron detectors, and proton detectors. What is special about the SAMURAI system is that projectile-rapidity protons or neutrons are detected with large angular and momentum acceptance in coincidence with heavy projectile fragments. With an effective combination of these equipments, the SAMURAI system allows us to perform various experiments: electromagnetic dissociation, various direct reactions, polarized deuteron induced reactions, and EOS studies. SAMURAI project is currently underway at RIBF. The construction of the superconducting dipole magnet will start in autumn 2010 and finish in spring 2011. The detectors are also being constructed in parallel. The first commissioning run will be performed in early 2012.

      DOI: 10.1088/1742-6596/312/5/052022

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    • Elastic scattering of 6He + p at 82.3MeV/nucleon 査読有り

      Jamil-Qureshi Faisal, Jian-Ling Lou, Yan-Lin Ye, Zhong-Xin Cao, Dong-Xing Jiang, Tao Zheng, Hui Hua, Zhi-Huan Li, Xiang-Qing Li, Yu-Cheng Ge, Dan-Yang Pang, Qi-Te Li, Jun Xiao, Lin-Hui Lv, Rui Qiao, Hai-Bo You, Rui-Jiu Chen, Fei Lu, H. Sakurai, H. Otsu, M. Nishimura, S. Sakaguchi, H. Baba, Y. Togano, K. Yoneda, Chen Li, Shuo Wang, He Wang, Kuo-Ang Li, T. Nakamura, Y. Nakayama, Y. Kondo, S. Deguchi, Y. Satou, K. H. Tshoo

      Chinese Physics Letters27 ( 9 )   2010年9月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)  

      Differential cross sections for the elastic scattering of halo nucleus 6He on proton target were measured at 82.3MeV/u. The experimental results are well reproduced by optical model calculations using global potential KD02 with a reduction of the depth of real volume part by a factor of 0.7. A systematic analysis shows that this behavior might be related to the weakly bound property of unstable nuclei. © 2010 Chinese Physical Society and IOP Publishing Ltd.

      DOI: 10.1088/0256-307X/27/9/092501

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    • Measurement of the proton-proton correlation function from the break-up of 22Mg and 20Ne 査読有り

      X. Y. Sun, J. G. Chen, D. Q. Fang, Y. G. Ma, X. Z. Cai, W. Guo, W. D. Tian, H. W. Wang, P. Zhou, G. Q. Zhang, X. G. Cao, Y. Fu, Z. G. Hu, J. S. Wang, M. Wang, Y. Togano, N. Aoi, H. Baba, T. Honda, K. Okada, Y. Hara, K. Ieki, Y. Ishibashi, Y. Itou, N. Iwasa, S. Kanno, T. Kawabata, H. Kimura, Y. Kondo, K. Kurita, M. Kurokawa, T. Moriguchi, H. Murakami, H. Oishi, S. Ota, A. Ozawa, H. Sakurai, S. Shimoura, R. Shioda, E. Takeshita, S. Takeuchi, K. Yamada, Y. Yamada, Y. Yasuda, K. Yoneda, T. Motobayashi

      International Journal of Modern Physics E19 ( 8-9 ) 1823 - 1828   2010年9月

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

      An experiment of 22Mg and 20Ne beams bombarding on a 12C target at an energy of 60∼70 A MeV has been performed at the RIKEN projectile fragment separator (RIPS) in the RIKEN Ring Cyclotron Facility to study the two-proton correlated emission from 22Mg and 20Ne excited states. The two-protons momentum correlation functions have been obtained for 22Mg and 20Ne, respectively. The trajectories of the 22Mg decayed products (20Ne + p + p) were also measured to get the angular correlations between the two protons in Center of Mass of decaying system by relativistic-kinematics reconstruction. The results exhibit that 22Mg has the features of 2He cluster decay mechanism. © 2010 World Scientific Publishing Company.

      DOI: 10.1142/S0218301310016259

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    • Nuclear structure study of N19,21 nuclei by γ spectroscopy 査読有り

      Z. Elekes, Zs. Vajta, Zs. Dombrádi, T. Aiba, N. Aoi, H. Baba, D. Bemmerer, Zs. Fülöp, N. Iwasa, Á Kiss, T. Kobayashi, Y. Kondo, T. Motobayashi, T. Nakabayashi, T. Nannichi, H. Sakurai, D. Sohler, S. Takeuchi, K. Tanaka, Y. Togano, K. Yamada, M. Yamaguchi, K. Yoneda

      Physical Review C - Nuclear Physics82 ( 2 )   2010年8月16日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Physical Society  

      The structure of neutron-rich nitrogen nuclei has been studied by use of neutron removal reaction and inelastic scattering. Mass and charge deformations have been deduced for the first excited state of N21, which indicates the partial persistence of the N=14 subshell closure in nitrogen isotopes. The spectroscopic information obtained on the structure of N19,21 confirms the results from a previous experiment. © 2010 The American Physical Society.

      DOI: 10.1103/PhysRevC.82.027305

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    • EXPERIMENTAL INVESTIGATION OF THE STELLAR REACTION S-30(p, gamma)(31) Cl VIA COULOMB DISSOCIATION 査読有り

      Y. Togano, T. Motobayashi, N. Aoi, H. Baba, S. Bishop, P. Doornenbal, T. Furukawa, S. Kanno, Y. Kondo, M. Kurokawa, Y. Matsuo, H. Murakami, S. Takeuchi, K. Yamada, K. Yoneda, X. Cai, D. Fang, Y. G. Ma, W. Tian, H. Wang, K. Ieki, K. Kurita, M. Matsushita, K. Okada, R. Shioda, Y. Yamada, N. Iwasa, N. Kume, T. Kawabata, S. Ota, S. Shimoura, N. Kobayashi, T. Nakamura, Y. Satou, K. N. Tanaka, T. Kuboki, J. Wang

      MODERN PHYSICS LETTERS A25 ( 21-23 ) 1763 - 1766   2010年7月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WORLD SCIENTIFIC PUBL CO PTE LTD  

      The Coulomb dissociation of the proton-rich nuclei Cl-31 was studied experimentally using Cl-31 beams at 58 MeV/nucleon with a lead target. The relative energy between the reaction products, S-30 and proton, was obtained. The first excited state in Cl-31 was observed which is relevant to the resonant capture of stellar S-30(p, gamma)Cl-31 reaction

      DOI: 10.1142/S0217732310000277

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    • Low-lying intruder state of the unbound nucleus 13Be 査読有り

      Y. Kondo, T. Nakamura, Y. Satou, T. Matsumoto, N. Aoi, N. Endo, N. Fukuda, T. Gomi, Y. Hashimoto, M. Ishihara, S. Kawai, M. Kitayama, T. Kobayashi, Y. Matsuda, N. Matsui, T. Motobayashi, T. Nakabayashi, T. Okumura, H. J. Ong, T. K. Onishi, K. Ogata, H. Otsu, H. Sakurai, S. Shimoura, M. Shinohara, T. Sugimoto, S. Takeuchi, M. Tamaki, Y. Togano, Y. Yanagisawa

      Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics690 ( 3 ) 245 - 249   2010年6月21日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)  

      An experimental study for the unbound nucleus 13Be has been performed by means of the invariant mass method via the one-neutron removal reaction 1H (14Be, 12Be + n). A resonance has been observed at 0.51(1) MeV in the relative energy (Erel) spectrum of the 12Be + n system. The transverse momentum distribution of the 12Be + n system as well as the resonance width of 0.45(3) MeV gives evidence for the p-wave nature of the resonance. A d-wave resonance has also been observed at 2.39(5) MeV in the Erel spectrum. The observation of the low-lying p-wave resonance indicates the disappearance of the N = 8 magicity in the vicinity of the neutron drip line region. © 2010 Elsevier B.V. All rights reserved.

      DOI: 10.1016/j.physletb.2010.05.031

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      その他リンク: http://orcid.org/0000-0002-7291-7809

    • Search for H7 in H2+He8 collisions

      E. Yu. Nikolskii, A. A. Korsheninnikov, H. Otsu, H. Suzuki, K. Yoneda, H. Baba, K. Yamada, Y. Kondo, N. Aoi, A. S. Denikin, M. S. Golovkov, A. S. Fomichev, S. A. Krupko, M. Kurokawa, E. A. Kuzmin, I. Martel, W. Mittig, T. Motobayashi, T. Nakamura, M. Niikura, S. Nishimura, A. A. Ogloblin, P. Roussel-Chomaz, A. Sanchez-Benitez, Y. Satou, S. I. Sidorchuk, T. Suda, S. Takeuchi, K. Tanaka, G. M. Ter-Akopian, Y. Togano, M. Yamaguchi

      Physical Review C - Nuclear Physics81 ( 6 ) 064606   2010年6月16日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Physical Society  

      An experimental search for the low-lying H7 resonance was performed with the H2(He8He3)H7 reaction studied at forward center-of-mass angles (6°-14°) with a 42 MeV He8 beam. No well-pronounced peak of H7 was observed
      however, the obtained spectrum was found to have a peculiarity at ∼2 MeV above the t+4n threshold. The data allow us to set a c.m.s. cross section level of ∼30 μb/sr for the low-energy part of the H7 spectrum. The test reaction H2(Be12He3)Li11, involving the same one-proton (d,He3) transfer, was studied simultaneously on a 71 A MeV satellite beam where a cross section of 1 mb/sr was measured for the population of the Li11 ground state. © 2010 The American Physical Society.

      DOI: 10.1103/PhysRevC.81.064606

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    • Measurement of two-proton correlation from the break-up of 23Al 査読有り

      P. Zhou, D. Q. Fang, Y. G. Ma, X. Z. Cai, J. G. Chen, W. Guo, X. Y. Sun, W. D. Tian, H. W. Wang, G. Q. Zhang, X. G. Cao, Y. Fu, Z. G. Hu, J. S. Wang, M. Wang, Y. Togano, N. Aoi, H. Baba, T. Honda, K. Okada, Y. Hara, K. Ieki, Y. Ishibashi, Y. Itou, N. Iwasa, S. Kanno, T. Kawabata, H. Kimura, Y. Kondo, K. Kurita, M. Kurokawa, T. Moriguchi, H. Murakami, H. Oishi, S. Ota, A. Ozawa, H. Sakurai, S. Shimoura, R. Shioda, E. Takeshita, S. Takeuchi, K. Yamada, Y. Yamada, Y. Yasuda, K. Yoneda, T. Motobayashi

      International Journal of Modern Physics E19 ( 5-6 ) 957 - 964   2010年6月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)  

      Experiments of 23Al and 22Mg radioactive beams bombarding a 12C target at an energy of 60 ∼70 A MeV have been performed at the projectile fragment separator beamline (RIPS) in the RIKEN Ring Cyclotron Facility to study the two-proton emission from 23Al and 22Mg excited states, respectively. The trajectorie of the decay products, namely 21Na + p + p from 23Al and 20Ne + p + p from 22Mg, are clean identified. The relative momentum and opening angle between two protons in the rest frame of three body decay channels are obtained by relativistic-kinematics reconstruction. The results demonstrate that there are some di-proton emission components from 2He cluster for the excited 23Al and 22Mg. © 2010 World Scientific Publishing Company.

      DOI: 10.1142/S0218301310015400

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    • Exploring the "island of inversion" by in-beam γ-ray spectroscopy of the neutron-rich sodium isotopes Na31,32,33 査読有り

      P. Doornenbal, H. Scheit, N. Kobayashi, N. Aoi, S. Takeuchi, K. Li, E. Takeshita, Y. Togano, H. Wang, S. Deguchi, Y. Kawada, Y. Kondo, T. Motobayashi, T. Nakamura, Y. Satou, K. N. Tanaka, H. Sakurai

      Physical Review C - Nuclear Physics81 ( 4 )   2010年4月

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      掲載種別:研究論文(学術雑誌)  

      The structure of the neutron-rich sodium isotopes Na31,32,33 was investigated by means of in-beam γ-ray spectroscopy following one-neutron knockout and inelastic scattering of radioactive beams provided by the RIKEN Radioactive Ion Beam Factory. The secondary beams were selected and separated by the fragment separator BigRIPS and incident at ≈ 240 MeV/nucleon on a natural carbon (secondary) target, which was surrounded by the DALI2 array to detect coincident de-excitation γ rays. Scattered particles were identified by the spectrometer ZeroDegree. In Na31, a new decay γ ray was observed in coincidence with the known (5/21+)→3/2g.s.(+) transition, while for Na32,33 excited states are reported for the first time. From a comparison to state-of-the-art shell-model calculations it is concluded that the newly observed excited state in Na31 belongs to a rotational band formed by a 2p2h intruder configuration within the "Island of Inversion." © 2010 The American Physical Society.

      DOI: 10.1103/PhysRevC.81.041305

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    • Astrophysical reaction rate of <sup>30</sup>S(p, γ)<sup>31</sup>Cl studied by Coulomb dissociation 査読有り

      Y. Togano, T. Motobayashi, N. Aoi, H. Baba, S. Bishop, X. Cai, P. Doornenbal, D. Fang, T. Furukawa, K. Ieki, N. Iwasa, T. Kawabata, S. Kanno, N. Kobayashi, Y. Kondo, T. Kuboki, N. Kume, K. Kurita, M. Kurokawa, Y. G. Ma, Y. Matsuo, H. Murakami, M. Matsushita, T. Nakamura, K. Okada, S. Ota, Y. Satou, S. Shimoura, R. Shioda, K. N. Tanaka, S. Takeuchi, W. Tian, H. Wang, J. Wang, K. Yamada, Y. Yamada, K. Yoneda

      Proceedings of Science   2010年

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      掲載種別:研究論文(国際会議プロシーディングス)  

      The Coulomb dissociation of the proton-rich nucleus 31Cl was studied experimentally using a 31Cl beam at 58 MeV/nucleon with a lead target. The relative energy spectrum between 30S ions and protons was obtained from the measured momentum vectors of the reaction products detected in coincidence by the invariant mass method. The first excited state in 31Cl was observed which is relevant to the resonant capture in the stellar 30S(p, γ)31Cl reaction. Discussion for another observed state is also given. © Copyright owned by the author(s).

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    • Measurement of proton capture cross sections relevant to rp process with Coulomb dissociation 査読有り

      Y. Togano

      10TH INTERNATIONAL SYMPOSIUM ON ORIGIN OF MATTER AND EVOLUTION OF GALAXIES1269   160 - 165   2010年

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

      We have studied proton capture reactions on unstable proton-rich nuclei relevant to rapid proton-capture (rp) process using a Coulomb dissociation method. Using this method, three stellar reactions, (22)mg(p, gamma)(23)Al, (26)Si(p, gamma)27(P), and (30)S(p,gamma)(31)Cl were studied at RIKEN Nishina Center. The radiative widths of the first excited state in (23)Al and (27)P, which are relevant to the stellar reactions, were obtained. We discuss the details of the Coulomb dissociation and the astrophysical implications obtained from our studies.

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    • Measurement on proton-proton correlation of the excited 23Al 査読有り

      Y. G. Ma, D. Q. Fang, P. Zhou, X. Z. Cai, J. G. Chen, W. Guo, X. Y. Sun, W. D. Tian, H. W. Wang, G. Q. Zhang, X. G. Cao, Y. Fu, Z. G. Hu, J. S. Wang, M. Wang, Y. Togano, N. Aoi, H. Baba, T. Honda, K. Okada, Y. Hara, K. Ieki, Y. Ishibashi, Y. Itou, N. Iwasa, S. Kanno, T. Kawabata, H. Kimura, Y. Kondo, K. Kurita, M. Kurokawa, T. Moriguchi, H. Murakami, H. Oishi, S. Ota, A. Ozawa, H. Sakurai, S. Shimoura, R. Shioda, E. Takeshita, S. Takeuchi, K. Yamada, Y. Yamada, Y. Yasuda, K. Yoneda, T. Motobayashi

      AIP Conference Proceedings1235   377 - 383   2010年

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

      We have measured two-proton momentum and angular correlations for the 23Al excited states from the 23Al radioactive beam on a 12C target at an energy of 60 ∼ 70 A MeV at the projectile fragment separator beamline (RIPS) in the RIKEN Ring Cyclotron Facility. The decay products, namely 21Na + p + p from 23Al are clean identified. The relative momentum and opening angle between two protons in the rest frame of three body decay channels demonstrate that there are some diproton emission components from 2He cluster for the excited 23Al. © 2010 American Institute of Physics.

      DOI: 10.1063/1.3442626

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    • Search for 7H at RIKEN 査読有り

      E. Yu Nikolskii, A. A. Korsheninnikov, H. Otsu, H. Suzuki, K. Yoneda, H. Baba, K. Yamada, Y. Kondo, N. Aoi, M. S. Golovkov, A. S. Fomichev, S. A. Krupko, M. Kurokawa, E. A. Kuzmin, I. Martel, W. Mittig, T. Motobayashi, T. Nakamura, M. Niikura, S. Nishimura, A. A. Ogloblin, P. Roussel-Chomaz, A. Sanchez-Benitez, Y. Satou, S. I. Sidorchuk, T. Suda, S. Takeuchi, K. Tanaka, G. M. Ter-Akopian, Y. Togano, M. Yamaguchia

      AIP Conference Proceedings1224   47 - 53   2010年

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

      Experimental search for the low-lying 7H resonance was performed in the d(8He, 3He) 7H reaction with a 8He beam at 42A MeV. No well-pronounced peak of 7H wasobserved, but the spectrum hassome peculiarities at ∼ 2 MeV and ∼ 10.5 MeV above the t + 4nthreshold. The d(12Be, 3He) 11Li reaction simultaneously measured at 71A MeV showed thepopulation of 11Li ground state with the c.m.s. cross section of ≈ 1 mb/sr. © 2010 American Institute of Physics.

      DOI: 10.1063/1.3431455

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    • Study of Fe-60(n,GAMMA;)Fe-61 reaction of astrophysical interest via d(Fe-60,pGAMMA;) indirect reaction 査読有り

      S. Giron, F. Hammache, N. de Sereville, D. Beaumel, J. Burgunder, L. Caceres, E. Clement, G. Duchene, F. Flavigny, G. De France, S. Franchoo, B. Fernandez, D. Galaviz-Redondo, L. Gasques, J. Gibelin, A. Gillibert, S. Grevy, J. Guillot, M. Heil, J. Kiener, V. Lapoux, F. Marechal, A. Matta, Y. Matea, M. Moukaddam, L. Nalpas, A. Obertelli, L. Perrot, R. Raabe, J. A. Scarpaci, O. Sorlin, I. Stefan, C. Stoedel, M. Takechi, J. C. Thomas, Y. Togano

      FIFTH EUROPEAN SUMMER SCHOOL ON EXPERIMENTAL NUCLEAR ASTROPHYSICS1213   201 - +   2010年

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

      INTEGRAL and RHESSI spacecrafts recently detected the 1.173 and 1.333 MeV gamma-ray lines coming from the Fe-60 - Co-60 - Ni-60 radioactive decay chain. The long lived isotope Fe-60 (T-1/2 = 1.5 10(6)y) is believed to be primarily produced in core-collapse supernovae. However the interpretation of the observations is difficult because of the large uncertainties concerning Fe-59(n,gamma)Fe-60 and Fe-60(n,gamma)Fe-61 cross sections, involved in Fe-60 nucleosynthesis.
      The direct component of the Fe-60(n,gamma)Fe-61 reaction was studied indirectly via the d(Fe-60,p gamma)Fe-61 transfer reaction. The experiment performed in GANIL in spring 2009 will allow to determine the excitation energies of the populated excited states of Fe-61 and for the first time their spectroscopic factors as well as their transfer angular momentum.
      I will first give an overview of the astrophysical context, then I will describe the experimental setup and finally present some preliminary results of the ongoing analysis.

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    • SIGNALS OF DIPROTON EMISSION FROM THE THREE BODY BREAKUP CHANNEL OF (23)AL AND (22)MG 査読有り

      Ma Y. G, Fang D. Q, Sun X. Y, Zhou P, Cai X. Z, Chen J. G, Guo W, Tian W. D, Wang H. W, Zhang G. Q, Cao X. G, Fu Y, Hu Z. G, Wang J. S, Wang M, Togano Y, Aoi N, Baba H, Honda T, Okada K, Hara Y, Ieki K, Ishibashi Y, Itou Y, Iwasa N, Kanno S, Kawabata T, Kimura H, Kondo Y, Kurita K, Kurokawa M, Moriguchi T, Murakami H, Oishi H, Ota S, Ozawa A, Sakurai H, Shimoura S, Shioda R, Takeshita E, Takeuchi S, Yamada K, Yamada Y, Yasuda Y, Yoneda K, Motobayashi T

      Nuclear Structure in China 2010   150 - 158   2010年

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    • Observation/confirmation of hindered E2 strength in 18C/16C 査読有り

      H. J. Ong, N. Imai, D. Suzuki, H. Iwasaki, H. Sakurai, T. K. Onishi, M. K. Suzuki, S. Ota, S. Takeuchi, T. Nakao, Y. Togano, Y. Kondo, N. Aoi, H. Baba, S. Bishop, Y. Ichikawa, M. Ishihara, T. Kubo, K. Kurita, T. Motobayashi, T. Nakamura, T. Okumura, Y. Yanagisawa

      European Physical Journal A42 ( 3 ) 393 - 396   2009年12月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)  

      We have measured the lifetime of the first excited 2+ state in 18C using an upgraded recoil shadow method to determine the electric quadrupole transition. The measured mean lifetime is 18.9±0.9 (stat)±4.4 (syst) ps, corresponding to, or about 1.5 Weisskopf units. The mean lifetime of the first 2+ state in 16C was remeasured to be 18.3±1.4±4.8 ps, about four times shorter than the value reported previously. The discrepancy is explained by incorporating the γ-ray angular distribution obtained in this work into the previous measurement. The observed transition strengths in 16, 18C are hindered compared to the empirical values, indicating that the anomalous E2 strength observed in 16C persists in 18C. © Società Italiana di Fisica / Springer-Verlag 2009.

      DOI: 10.1140/epja/i2009-10804-8

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      その他リンク: http://orcid.org/0000-0002-7291-7809

    • Decay pattern of pygmy states observed in neutron-rich 26Ne 査読有り

      J. Gibelin, D. Beaumel, T. Motobayashi, Y. Blumenfeld, N. Aoi, H. Baba, Z. Elekes, S. Fortier, N. Frascaria, N. Fukuda, T. Gomi, K. Ishikawa, Y. Kondo, T. Kubo, V. Lima, T. Nakamura, A. Saito, Y. Satou, J. A. Scarpaci, E. Takeshita, S. Takeuchi, T. Teranishi, Y. Togano, A. M. Vinodkumar, Y. Yanagisawa, K. Yoshida

      International Journal of Modern Physics E18 ( 10 ) 2050 - 2055   2009年11月

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

      Coulomb excitation of the exotic neutron-rich nucleus 26Ne on a 208Pb target was measured at 58 A.MeV in order to search for low-lying E1 strength above the neutron emission threshold. The radioactive beam was produced by fragmentation of a 95 A.MeV Ar beam delivered by the RIKEN Accelerator Research Facility. The set-up included a NaI(Tl) gamma-ray array, a charged fragment hodoscope and a neutron wall. Using the invariant mass method in the 25Ne+n channel, we observe by multipole decomposition a sizable amount of E1 strength between 6 and 10 MeV excitation energy. For the first time, the decay pattern of low-lying strength in a neutron-rich nucleus is measured. © 2009 World Scientific Publishing Company.

      DOI: 10.1142/S0218301309014275

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    • Low-lying states in Mg32 studied by proton inelastic scattering 査読有り 国際誌

      S. Takeuchi, N. Aoi, T. Motobayashi, S. Ota, E. Takeshita, H. Suzuki, H. Baba, T. Fukui, Y. Hashimoto, K. Ieki, N. Imai, H. Iwasaki, S. Kanno, Y. Kondo, T. Kubo, K. Kurita, T. Minemura, T. Nakabayashi, T. Nakamura, T. Okumura, T. K. Onishi, H. Sakurai, S. Shimoura, R. Sugou, D. Suzuki, M. K. Suzuki, M. Takashina, M. Tamaki, K. Tanaka, Y. Togano, K. Yamada

      Physical Review C - Nuclear Physics79 ( 5 ) 054319-1 - 054319-11   2009年5月1日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Physical Society  

      Proton inelastic scattering on the neutron-rich nucleus Mg32 has been studied at 46.5 MeV/nucleon in inverse kinematics. Populated states were identified by measuring de-excitation γ rays, in which five new states were found by γ-γ coincidence analyses. By analyzing the angular differential cross sections via coupled-channel calculations, their spins and parities were constrained and the amplitudes for each transition were extracted. The spin and parity of the 2321-keV state was assigned as 41+. The ratio between the energies of the 21+ and 41+ states indicates that Mg32 is a transitional nucleus rather than an axially deformed rigid rotor. The collectivities in the nucleus Mg32 with N=20 are discussed based on the results obtained in the present experiment. © 2009 The American Physical Society.

      DOI: 10.1103/PhysRevC.79.054319

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    • Anomalously hindered E2 strengths in 16,18C 査読有り

      Hooi Jin Ong, Nobuaki Imai, Daisuke Suzuki, Hironori Iwasaki, Takeo Onishi, Masaru Suzuki, Taro Nakao, Yuichi Ichikawa, Shinsuke Ota, Hiroyoshi Sakurai, Satoshi Takeuchi, Nori Aoi, Hidetada Baba, Shawn Bishop, Masayasu Ishihara, Toshiyuki Kubo, Tohru Motobayashi, Yoshiyuki Yanagisawa, Yasuhiro Togano, Kazuo Kurita, Yosuke Kondo, Takashi Nakamura, Toshifumi Okumura

      International Journal of Modern Physics A24 ( 11 ) 2168 - 2174   2009年4月30日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)  

      Lifetime measurement of the first excited 2+ state in 18C was performed using an upgraded recoil shadow method to determine the electric quadrupole transition. The measured mean lifetime is 18.9 ± 0.9 (stat) ± 4.4 (syst) ps, which corresponds to a B(E2
      2 1 +→ 0gs + value of 4.3 ± 0.2 ± 1.0 e2fm4, or about 1.5 Weisskopf units. The mean lifetime of the first 2+ state in 16C was remeasured to be about 18 ps, about four times shorter than the value reported previously. By incorporating the γ-ray angular distribution measured in this work into the previous measurement, this discrepancy has been explained. The observed transition strengths in 16,18C are hindered compared to the empirical transition strengths, indicating that the anomalous hindered E2 strength observed in 16C persists in 18C. © 2009 World Scientific Publishing Company.

      DOI: 10.1142/S0217751X09045753

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    • Low-lying non-normal parity states in 8B measured by proton elastic scattering on 7Be 査読有り

      H. Yamaguchi, Y. Wakabayashi, S. Kubono, G. Amadio, H. Fujikawa, T. Teranishi, A. Saito, J. J. He, S. Nishimura, Y. Togano, Y. K. Kwon, M. Niikura, N. Iwasa, K. Inafuku, L. H. Khiem

      Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics672 ( 3 ) 230 - 234   2009年2月23日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)  

      A new measurement of proton resonance scattering on 7Be was performed up to the center-of-mass energy of 6.7 MeV using the low-energy RI beam facility CRIB (CNS Radioactive Ion Beam separator) at the Center for Nuclear Study of the University of Tokyo. The excitation function of 7Be + p elastic scattering above 3.5 MeV was measured successfully for the first time, providing important information about the resonance structure of the 8B nucleus. The resonances are related to the reaction rate of 7Be(p, γ)8B, which is the key reaction in solar 8B neutrino production. Evidence for the presence of two negative parity states is presented. One of them is a 2- state observed as a broad s-wave resonance, the existence of which had been questionable. Its possible effects on the determination of the astrophysical S-factor of 7Be(p, γ)8B at solar energy are discussed. The other state had not been observed in previous measurements, and its spin and parity were determined as 1-. © 2009 Elsevier B.V. All rights reserved.

      DOI: 10.1016/j.physletb.2009.01.033

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    • Development of large deformation in Cr62 査読有り 国際誌

      N. Aoi, E. Takeshita, H. Suzuki, S. Takeuchi, S. Ota, H. Baba, S. Bishop, T. Fukui, Y. Hashimoto, H. J. Ong, E. Ideguchi, K. Ieki, N. Imai, M. Ishihara, H. Iwasaki, S. Kanno, Y. Kondo, T. Kubo, K. Kurita, K. Kusaka, T. Minemura, T. Motobayashi, T. Nakabayashi, T. Nakamura, T. Nakao, M. Niikura, T. Okumura, T. K. Ohnishi, H. Sakurai, S. Shimoura, R. Sugo, D. Suzuki, M. K. Suzuki, M. Tamaki, K. Tanaka, Y. Togano, K. Yamada

      Physical Review Letters102 ( 1 ) 012502-1 - 012502-4   2009年1月5日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)  

      The structure of neutron-rich isotopes Cr60 and Cr62 was studied via proton inelastic scattering in inverse kinematics. The deformation lengths (δ) for Cr60 and Cr62 were extracted as 1.12(16) and 1.36(14)fm, respectively, providing evidence for enhanced collectivity in these nuclei. An excited state at 1180(10) keV in Cr62 was identified for the first time. We adopted 4+ as its spin and parity, leading to the rapid increase of the Ex(4+)/Ex(2+) ratio, which indicates the development of large deformation in Cr62 near N=40. Importance of the admixture of the gd-shell component above N=40 is also discussed by comparing with a modern shell model calculation. © 2009 The American Physical Society.

      DOI: 10.1103/PhysRevLett.102.012502

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    • One-neutron removal reactions of C18 and C19 on a proton target 査読有り

      Y. Kondo, T. Nakamura, Y. Satou, T. Matsumoto, N. Aoi, N. Endo, N. Fukuda, T. Gomi, Y. Hashimoto, M. Ishihara, S. Kawai, M. Kitayama, T. Kobayashi, Y. Matsuda, N. Matsui, T. Motobayashi, T. Nakabayashi, K. Ogata, T. Okumura, H. J. Ong, T. K. Onishi, H. Otsu, H. Sakurai, S. Shimoura, M. Shinohara, T. Sugimoto, S. Takeuchi, M. Tamaki, Y. Togano, Y. Yanagisawa

      Physical Review C - Nuclear Physics79 ( 1 )   2009年1月5日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Physical Society  

      We have studied the one-neutron removal reactions of C18 at 81 MeV/nucleon and C19 at 68 MeV/nucleon on a liquid hydrogen target. Transverse-momentum distributions of the core fragments C17 and C18, and their partial cross sections, are measured using coincidences with the γ rays. These are compared to theoretical calculations based on the continuum-discretized coupled-channels (CDCC) method. We have found that the transverse-momentum distributions of C17 are well described by the CDCC calculations, and the agreement provides evidence for the spin-parity assignments of Jπ=1/2+ for the 0.21-MeV state and Jπ=5/2+ for the 0.33-MeV state in C17. The Jπ=(2,3)+ assignment for the 4.0-MeV state in C18 is obtained for the first time based on the momentum distribution of C18. The measured partial cross sections are consistent with the CDCC calculations combined with shell-model spectroscopic factors. The present study demonstrates that the transverse-momentum distribution obtained in a one-neutron removal reaction on a proton target is as useful as the conventional longitudinal-momentum distribution measured with the heavier Be or C targets for determining the orbital angular momentum of a removed neutron. © 2009 The American Physical Society.

      DOI: 10.1103/PhysRevC.79.014602

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      その他リンク: http://orcid.org/0000-0002-7291-7809

    • Nuclear astrophysical studies using low-energy RI beams at CRIB 査読有り

      H. Yamaguchi, Y. Wakabayashi, S. Hayakawa, D. N. Binh, D. Kahl, Y. Kurihara, S. Kubono, T. Teranishi, J. J. He, Y. K. Kwon, S. Nishimura, Y. Togano, N. Iwasa, M. Niikura, L. H. Khiem

      AIP Conference Proceedings1120   189 - 193   2009年

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

      CRIB (CNS Radioactive Ion Beam separator) is a low-energy RI beam separator at the Center for Nuclear Study (CNS) of the University of Tokyo, used for various studies covering nuclearastrophysical topics. An application of the RI beam at CRIB for the astrophysical studies is a new measurement of the proton resonance scattering on 7Be. The measurement was performed up to the excitation energy of 6.8MeV, ans the excitation function above 3.5MeV was successfully measured for the first time, providing important information about the reaction rate of 7Be(p,γ)8B, which is the key reaction in the solar 8B neutrino production. A preliminary result of the 7Be+p experiment is presented. © 2009 American Institute of Physics.

      DOI: 10.1063/1.3141645

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    • Decay Pattern of Pygmy States Observed in Neutron-Rich (26)Ne 査読有り 国際共著 国際誌

      J. Gibelin, D. Beaumel, T. Motobayashi, Y. Blumenfeld, N. Aoi, H. Baba, Z. Elekes, S. Fortier, N. Frascaria, N. Fukuda, T. Gomi, K. Ishikawa, Y. Kondo, T. Kubo, V. Lima, T. Nakamura, A. Saito, Y. Satou, J. -A. Scarpaci, E. Takeshita, S. Takeuchi, T. Teranishi, Y. Togano, A. M. Vinodkumar, Y. Yanagisawa, K. Yoshida

      PHYSICAL REVIEW LETTERS101 ( 21 ) 212503-1 - 212503-4   2008年11月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      Coulomb excitation of the exotic neutron-rich nucleus (26)Ne on a (208)Pb target was measured at 58 MeV/u in order to search for low-lying E1 strength above the neutron emission threshold. This radioactive beam experiment was carried out at the RIKEN Accelerator Research Facility. Using the invariant mass method in the (25)Ne+n channel, we observe a sizable amount of E1 strength between 6 and 10 MeV excitation energy. By performing a multipole decomposition of the differential cross section, a reduced dipole transition probability of B(E1)=0.49 +/- 0.16e(2) fm(2) is deduced, corresponding to 4.9 +/- 1.6% of the Thomas-Reiche-Kuhn sum rule. For the first time, the decay pattern of low-lying strength in a neutron-rich nucleus is measured. The extracted decay pattern is not consistent with several mean-field theory descriptions of the pygmy states.

      DOI: 10.1103/PhysRevLett.101.212503

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    • Lifetime measurements of excited states in C-17: Possible interplay between collectivity and halo effects 査読有り 国際誌

      D. Suzuki, H. Iwasaki, H. J. Ong, N. Imai, H. Sakurai, T. Nakao, N. Aoi, H. Baba, S. Bishop, Y. Ichikawa, M. Ishihara, Y. Kondo, T. Kubo, K. Kurita, T. Motobayashi, T. Nakamura, T. Okumura, T. K. Onishi, S. Ota, M. K. Suzuki, S. Takeuchi, Y. Togano, Y. Yanagisawa

      PHYSICS LETTERS B666 ( 3 ) 222 - 227   2008年8月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

      Lifetime measurements were performed on low-lying excited states of the neutron-rich isotope C-17 using the recoil shadow method. The gamma-decay mean lifetimes were determined to be 583 +/- 21(stat) +/- 35(syst) ps for the first excited state at 212 keV and 18.9 +/- 0.6(stat) +/- 4.7(syst) ps for the second excited state at 333 keV. Based on a comparison with the empirical upper limits for the electromagnetic transition strengths, these decays are concluded to be predominantly M1 transitions. The reduced M1 transition probabilities to the ground state were deduced to be (1.0 +/- 0.1) x 10(-2)mu(2)(N) and (8.2(-1.8)(+3.2)) x 10(-2)mu(2)(N), respectively, for the first and second excited states. The strongly hindered M11 strength as well as the lowered excitation energy represents unique nature of the 212-keV state. (C) 2008 Elsevier B.V. All rights reserved.

      DOI: 10.1016/j.physletb.2008.07.055

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    • Persistence of the N=50 shell closure in the neutron-rich isotope (80)Ge 査読有り 国際誌

      H. Iwasaki, S. Michimasa, M. Niikura, M. Tamaki, N. Aoi, H. Sakurai, S. Shimoura, S. Takeuchi, S. Ota, M. Honma, T. K. Onishi, E. Takeshita, H. J. Ong, H. Baba, Z. Elekes, T. Fukuchi, Y. Ichikawa, M. Ishihara, N. Iwasa, S. Kanno, R. Kanungo, S. Kawai, T. Kubo, K. Kurita, T. Motobayashi, A. Saito, Y. Satou, H. Suzuki, M. K. Suzuki, Y. Togano, Y. Yanagisawa

      PHYSICAL REVIEW C78 ( 2 ) 021304(R)-1 - 021304(R)-5   2008年8月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      The 2(1)(+) and 2(2)(+) states of the neutron-rich isotope (80)Ge were studied by intermediate-energy heavy-ion scattering, providing for the first time the experimental value of B(E2; 2(2)(+) -&gt; 0(g.s)(+)) for (80)Ge. The experimental data are well reproduced by large-scale shell model calculations, which suggest the important role of the proton particle-hole 2p(3/2)-1 f(5/2) excitation in the configuration of the 2(2)(+) state.

      DOI: 10.1103/PhysRevC.78.021304

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    • Lifetime measurements of first excited states in C16,18 査読有り

      H. J. Ong, N. Imai, D. Suzuki, H. Iwasaki, H. Sakurai, T. K. Onishi, M. K. Suzuki, S. Ota, S. Takeuchi, T. Nakao, Y. Togano, Y. Kondo, N. Aoi, H. Baba, S. Bishop, Y. Ichikawa, M. Ishihara, T. Kubo, K. Kurita, T. Motobayashi, T. Nakamura, T. Okumura, Y. Yanagisawa

      Physical Review C - Nuclear Physics78 ( 1 )   2008年7月10日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Physical Society  

      The electric quadrupole transition from the first 2+ state to the ground 0+ state in C18 was studied through a lifetime measurement by an upgraded recoil shadow method applied to inelastically scattered radioactive C18 nuclei. The measured mean lifetime is 18.9±0.9(stat)±4.4(syst) ps, corresponding to a B(E2
      21+→0g.s.+) value of 4.3±0.2±1.0e2 fm4, or about 1.5 Weisskopf units. The mean lifetime of the first 2+ state in C16 was remeasured to be 18.3±1.4±4.8 ps, about four times shorter than the value reported previously. The discrepancy between the two results was explained by incorporating the γ-ray angular distribution measured in this work into the previous measurement. These transition strengths are hindered compared to the empirical transition strengths, indicating that the anomalous hindrance observed in C16 persists in C18. © 2008 The American Physical Society.

      DOI: 10.1103/PhysRevC.78.014308

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    • Lifetime measurements of first excited states in C-16,C-18 査読有り 国際誌

      H. J. Ong, N. Imai, D. Suzuki, H. Iwasaki, H. Sakurai, T. K. Onishi, M. K. Suzuki, S. Ota, S. Takeuchi, T. Nakao, Y. Togano, Y. Kondo, N. Aoi, H. Baba, S. Bishop, Y. Ichikawa, M. Ishihara, T. Kubo, K. Kurita, T. Motobayashi, T. Nakamura, T. Okumura, Y. Yanagisawa

      PHYSICAL REVIEW C78 ( 1 ) 014308-1 - 014308-11   2008年7月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

      The electric quadrupole transition from the first 2(+) state to the ground 0(+) state in C-18 was studied through a lifetime measurement by an upgraded recoil shadow method applied to inelastically scattered radioactive C-18 nuclei. The measured mean lifetime is 18.9 +/- 0.9(stat) +/- 4.4(syst) ps, corresponding to a B(E2;2(1)(+)-&gt; 0(g.s.)(+)) value of 4.3 +/- 0.2 +/- 1.0 e(2) fm(4), or about 1.5 Weisskopf units. The mean lifetime of the first 2(+) state in C-16 was remeasured to be 18.3 +/- 1.4 +/- 4.8 ps, about four times shorter than the value reported previously. The discrepancy between the two results was explained by incorporating the gamma-ray angular distribution measured in this work into the previous measurement. These transition strengths are hindered compared to the empirical transition strengths, indicating that the anomalous hindrance observed in C-16 persists in C-18.

      DOI: 10.1103/PhysRevC.78.014308

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    • Shape transition observed in neutron-rich pf-shell isotopes studied via proton inelastic scattering 査読有り

      N. Aoi, H. Suzuki, E. Takeshita, S. Takeuchi, S. Ota, H. Baba, S. Bishop, T. Fukui, Y. Hashimoto, H. J. Ong, E. Ideguchi, K. Ieki, N. Imai, H. Iwasaki, S. Kanno, Y. Kondo, T. Kubo, K. Kurita, K. Kusaka, T. Minemura, T. Motobayashi, T. Nakabayashi, T. Nakamura, T. Nakao, M. Niikura, T. Okumura, T. K. Ohnishi, H. Sakurai, S. Shimoura, R. Sugo, D. Suzuki, M. K. Suzuki, M. Tamaki, K. Tanaka, Y. Togano, K. Yamada

      Nuclear Physics A805 ( 1-4 ) 400 - 407   2008年6月1日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)  

      The structure of the neutron rich pf-shell nuclei 58Ti36, 60Cr36 and 62Cr38 was studied by proton inelastic scattering in inverse kinematics. Large quadrupole deformation lengths of 1.12(16) fm and 1.36(14) fm were obtained for 60Cr and 62Cr, respectively, which confirm the enhanced collectivity in these nuclei. An excited state was observed in 62Cr at 1180(10) keV with tentative assignment of Jπ = 4+. The increase in the Ex (4+) / Ex (2+) ratio indicates that the nature of collectivity changes from vibrational to rotational in 62Cr and affords evidence for the development of static deformation. The excitation energy of the newly observed 2+ state in 58Ti (1046(17) keV) shows hindered collectivity. The contrast between the structures of Cr and Ti suggests that the contributions of both protons and neutrons are crucial for the large collectivity in Cr close to N = 40. From the comparison to shell model calculations, the large collectivity is found to originate from the admixture of the pf- and gd-shells across the N = 40 sub-shell gap. © 2008 Elsevier B.V. All rights reserved.

      DOI: 10.1016/j.nuclphysa.2008.02.280

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      その他リンク: http://orcid.org/0000-0002-7291-7809

    • Investigation of stellar Si-26(p,gamma)P-27 reaction via Coulomb dissociation 査読有り

      Y. Togano, T. Gomi, T. Motobayashi, Y. Ando, N. Aoi, H. Baba, K. Demichi, Z. Elekes, N. Fukuda, Zs. Fulop, U. Futakami, H. Hasegawa, Y. Higurashi, K. Ieki, N. Imai, M. Ishihara, K. Ishikawa, N. Iwasa, H. Iwasaki, S. Kanno, Y. Kondo, T. Kubo, S. Kubono, M. Kunibu, K. Kurita, Y. U. Matsuyama, S. Michimasa, T. Minemura, M. Miura, H. Murakami, T. Nakamura, M. Notani, S. Ota, A. Saito, H. Sakurai, M. Serata, S. Shimoura, T. Sugimoto, E. Takeshita, S. Takeuchi, K. Ue, K. Yamada, Y. Yanagisawa, K. Yoneda, A. Yoshida

      ORIGIN OF MATTER AND EVOLUTION OF GALAXIES1016   193 - +   2008年

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

      The Coulomb dissociation of the proton-rich nuclei P-27 was studied experimentally using P-27 beams at 57 MeV/nucleon with a lead target. The radiative widths of the low-lying excited state in (27)p were deduced. The resonant capture reaction rate of stellar Si-26(p,gamma)(27)p through these states was estimated using the measured radiative widths. The astrophysical implications obtained from the extracted reaction rate will be discussed.

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    • Nuclear structure of B-8 studied by proton resonance scatterings on Be-7 査読有り

      H. Yamaguchi, Y. Wakabayashi, S. Hayakawa, G. Amadio, S. Kubono, H. Fujikawa, A. Saito, J. J. He, T. Teranishi, Y. K. Kwon, S. Nishimura, Y. Togano, N. Iwasa, K. Inafuku, M. Niikura, D. N. Binh, L. H. Khiem

      ORIGIN OF MATTER AND EVOLUTION OF GALAXIES1016   307 - +   2008年

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

      A new measurement of the proton resonance scattering on 7 Be was performed up to the excitation energy of 6.8 MeV using the low-energy RI beam facility CRIB (CNS Radioactive Ion Beam separator) at the Center for Nuclear Study (CNS) of the University of Tokyo. The excitation function of B-8 above 3.5 MeV was successfully measured for the first time, providing important information about the reaction rate of Be-7(p,gamma)B-8, which is the key reaction in the solar B-8 neutrino production. For more intensive experimental studies with RI beams, the development of a cryogenic gas target system is ongoing at CNS. In this paper a preliminary result of the Be-7 experiment and the present status of the development of the target system are presented.

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    • Measurement of the B(E2,01+→21+) in the N=16 nucleus Ne26 査読有り 国際共著 国際誌

      J. Gibelin, D. Beaumel, T. Motobayashi, N. Aoi, H. Baba, Y. Blumenfeld, Zs Dombrádi, Z. Elekes, S. Fortier, N. Frascaria, N. Fukuda, T. Gomi, K. Ishikawa, Y. Kondo, T. Kubo, V. Lima, T. Nakamura, A. Saito, Y. Satou, E. Takeshita, S. Takeuchi, T. Teranishi, Y. Togano, A. M. Vinodkumar, Y. Yanagisawa, K. Yoshida

      Physical Review C - Nuclear Physics75 ( 5 ) 057306-1 - 057306-4   2007年5月18日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)  

      Differential cross section of the inelastic scattering of a 54 MeV/nucleon Ne26 beam on a lead target has been measured by detecting the deexcitation γ-rays. Analysis of the first 2+ state angular distribution of the inelastically scattered nuclei shows that the process cannot be considered as a pure Coulomb excitation, and nuclear contribution must be taken into account. The charge deformation deduced, β2C=0.392±0.024, corresponds to a B(E2)=141±18e2fm2 in agreement with a N=16 subshell closure. © 2007 The American Physical Society.

      DOI: 10.1103/PhysRevC.75.057306

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    • Search for low lying dipole strength in the neutron rich nucleus 26Ne 査読有り

      J. Gibelin, D. Beaumel, T. Motobayashi, N. Aoi, H. Baba, Y. Blumenfeld, Z. Elekes, S. Fortier, N. Frascaria, N. Fukuda, T. Gomi, K. Ishikawa, Y. Kondo, T. Kubo, V. Lima, T. Nakamura, A. Saito, Y. Satou, E. Takeshita, S. Takeuchi, T. Teranishi, Y. Togano, A. M. Vinodkumar, Y. Yanagisawa, K. Yoshida

      Nuclear Physics A788 ( 1-4 ) 153 - 158   2007年5月15日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)  

      Coulomb excitation of the exotic neutron-rich nucleus 26Ne on a natPb target was measured at 58 A.MeV in order to search for low-lying E1 strength above the neutron emission threshold. Data were also taken on an natAl target to estimate the nuclear contribution. The radioactive beam was produced by fragmentation of a 95 A.MeV 40Ar beam delivered by the RIKEN Research Facility. The set-up included a NaI gamma-ray array, a charged fragment hodoscope and a neutron wall. Using the invariant mass method in the 25Ne+n channel, we observe a sizable amount of E1 strength between 6 and 10 MeV. The reconstructed 26Ne angular distribution confirms its E1 nature. A reduced dipole transition probability of B (E 1) = 0.49 ± 0.16 e2fm2 is deduced. For the first time, the decay pattern of low-lying strength in a neutron-rich nucleus is obtained. The results are discussed in terms of a pygmy resonance centered around 9 MeV. © 2007 Elsevier B.V. All rights reserved.

      DOI: 10.1016/j.nuclphysa.2007.01.076

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    • Coulomb excitation of Ne-26 査読有り

      D. Beaumel, J. Gibelin, T. Motobayashi, N. Aoi, H. Baba, Y. Blumenfeld, Z. Elekes, S. Fortier, N. Frascaria, N. Fukuda, T. Gomi, K. Ishikawa, Y. Kondo, T. Kubo, V. Lima, T. Nakamura, A. Saito, Y. Satou, E. Takeshita, S. Takeuchi, T. Teranishi, Y. Togano, A. M. Vinodkumar, Y. Yanagisawa, K. Yoshida

      TOURS SYMPOSIUM ON NUCLEAR PHYSICS VI891   192 - +   2007年

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

      Coulomb excitation of the exotic neutron-rich nucleus Ne-26 on a Pb-208 target was measured at 58 A.MeV in order to search for low-lying E1 strength above the neutron emission threshold. Data were also taken on an A1 target to estimate the nuclear contribution. The radioactive beam was produced by fragmentation of a 95 A.MeV Ar beam delivered by the RIKEN Research Facility. The set-up included a NaI gamma-ray array, a charged fragment hodoscope and a neutron wall. Using the invariant mass method in the Ne-25+n channel, we observe a sizable amount of E1 strength between 6 and 10 MeV excitation energy. By performing a multipole decomposition of the differential cross-section, a reduced dipole transition probability of B(E1)=0.49 +/- 0.16 e(2)fm(2) is deduced. For the first time, the decay pattern of low-lying strength in a neutron-rich nucleus is measured.

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    • Proton inelastic scattering on 32Mg 査読有り

      S. Takeuchi, N. Aoi, H. Baba, T. Fukui, Y. Hashimoto, K. Ieki, N. Imai, H. Iwasaki, S. Kanno, Y. Kondo, T. Kubo, K. Kurita, T. Minemura, T. Motobayashi, T. Nakabayashi, T. Nakamura, T. Okumura, T. K. Onishi, S. Ota, H. Sakurai, S. Shimoura, R. Sugou, D. Suzuki, H. Suzuki, M. K. Suzuki, E. Takeshita, M. Tamaki, K. Tanaka, Y. Togano, K. Yamada

      Journal of Physics: Conference Series49 ( 1 ) 153 - 154   2006年10月10日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Physics Publishing  

      Proton inelastic scattering was applied to 32Mg located at the island of inversion to study higher excited states. Angle-integrated and differential cross sections for Ex 885 keV and 2321 keV states were obtained by measuring de-excitation γ rays and scattering angles of 32Mg. From the present analysis, the transferred angular momentum from the ground state to 2321 keV state was close to ΔL 4 rather than ΔL 3. © 2006 IOP Publishing Ltd.

      DOI: 10.1088/1742-6596/49/1/033

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      その他リンク: http://orcid.org/0000-0001-8864-369X

    • Study of the26Si(p,γ)27P reaction through Coulomb dissociation of27P 査読有り

      Y. Togano, T. Gomi, T. Motobayashi, Y. Ando, N. Aoi, H. Baba, K. Demichi, Z. Elekes, N. Fukuda, Zs. Fülöp, U. Futakami, H. Hasegawa, Y. Higurashi, K. Ieki, N. Imai, M. Ishihara, K. Ishikawa, N. Iwasa, H. Iwasaki, S. Kanno, Y. Kondo, T. Kubo, S. Kubono, M. Kunibu, K. Kurita, Y. U. Matsuyama, S. Michimasa, T. Minemura, M. Miura, H. Murakami, T. Nakamura, M. Notani, S. Ota, A. Saito, H. Sakurai, M. Serata, S. Shimoura, T. Sugimoto, E. Takeshita, S. Takeuchi, K. Ue, K. Yamada, Y. Yanagisawa, K. Yoneda, A. Yoshida

      European Physical Journal A27 ( 1 ) 233 - 236   2006年3月

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

      The Coulomb dissociation of 27P was studied experimentally using 27P beams at 57 MeV/nucleon with a lead target. The E2 gamma decay width of the first excited state in 27P was determined to be (2.8 ±0.5) × 10-5 eV. The total (M1 + E2) gamma decay width of the state, which is of astrophysical interest, is estimated by combining the experimental result and a shell model calculation. The reaction rate of 26Si(p, γ)27P is deduced from the estimated total gamma decay width. The astrophysical implication derived from estimated gamma decay width is discussed.

      DOI: 10.1140/epja/i2006-08-036-3

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    • Coulomb dissociation of 27P for study of 26Si(p, γ)27P reaction 査読有り

      Y. Togano, T. Gomi, T. Motobayashi, Y. Ando, N. Aoi, H. Baba, K. Demichi, Z. Elekes, N. Fukuda, Zs Fülöp, U. Futakami, H. Hasegawa, Y. Higurashi, K. Ieki, N. Imai, M. Ishihara, K. Ishikawa, N. Iwasa, H. Iwasaki, S. Kanno, Y. Kondo, T. Kubo, S. Kubono, M. Kunibu, K. Kurita, Y. U. Matsuyama, S. Michimasa, T. Minemura, M. Miura, H. Murakami, T. Nakamura, M. Notani, S. Ota, A. Saito, M. Serata, S. Shimoura, T. Sugimoto, E. Takeshita, S. Takeuchi, K. Ue, K. Yamada, Y. Yanagisawa, K. Yoneda, A. Yoshida

      AIP Conference Proceedings847   281 - 286   2006年

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

      The Coulomb dissociation of the proton-rich nuclei 27P was studied experimentally using a 27P beam at 57 MeV/nucleon with a lead target. The γ decay widths of the low-lying excited states in 27P were deduced. The resonant capture reaction rate of stellar 26Si(p,γ)27P through these states was estimated using the measured γ decay width. The astrophysical implications derived from the estimated reaction rate is discussed. © 2006 American Institute of Physics.

      DOI: 10.1063/1.2234414

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    • Proton resonance scattering of 7Be 査読有り

      H. Yamaguchi, A. Saito, J. J. He, Y. Wakabayashi, G. Amadio, H. Fujikawa, S. Kubono, L. H. Khiem, Y. K. Kwon, M. Niikura, T. Teranishi, S. Nishimura, Y. Togano, N. Iwasa, K. Inafuku

      AIP Conference Proceedings847   275 - 280   2006年

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

      We have studied the proton resonance scattering of 7Be by using a pure 7Be beam produced at CRIB (CNS Radioactive Ion Beam separator
      CNS stands for Center of Nuclear Study, University of Tokyo). The excitation function of 8B was measured up to the excitation energy of 6.8 MeV, with the thick-target method. The excited states of 8B higher than 3.5 MeV were not known by the past experiments. This proton elastic scattering is also of importance in relation with the 7Be(p,γ) 8B reaction, which is a key reaction in the standard solar model. © 2006 American Institute of Physics.

      DOI: 10.1063/1.2234413

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    • Study of inelastic contribution in the 7Be + p scattering experiment at CRIB 査読有り

      G. Amadio, H. Yamaguchi, J. J. He, A. Saito, Y. Wakabayashi, H. Fujikawa, S. Kubono, L. H. Khiem, Y. K. Kwon, T. Teranishi, S. Nishimura, M. Niikura, Y. Togano, N. Iwasa, S. Inafuku

      AIP Conference Proceedings847   362 - 364   2006年

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

      The 7Be(p,γ)8B reaction is undoubtfully important to the understanding of the solar model. As a step in the direction of improving the accuracy of the S17 astrophysical factor, a study of the 7Be + p scattering was performed with the thick target method at the CRIB facility. In addition to its astrophysical significance, this reaction is also useful to clarify the nuclear structure of 8B. A primary beam of 7Li and a hydrogen gas target were used to produce a 7Be secondary beam at 7.69 MeV/u. This was the first time in which γ-rays were measured in coincidence with protons, and we have successfully measured the inelastic contribution to the scattering cross section. © 2006 American Institute of Physics.

      DOI: 10.1063/1.2234426

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    • Search for low-lying dipole strength in the Neutron-Rich nucleus 26Ne 査読有り

      J. Gibelin, D. Beaumel, T. Motobayashi, N. Aoi, H. Baba, Y. Blumenfeld, Z. Elekes, S. Fortier, N. Frascaria, N. Fukuda, T. Gomi, K. Ishikawa, Y. Kondo, T. Kubo, V. Lima, T. Nakamura, A. Saito, Y. Satou, E. Takeshita, S. Takeuchi, T. Teranishi, Y. Togano, A. M. Vinodkumar, Y. Yanagisawa, K. Yoshida

      AIP Conference Proceedings802   198 - 201   2005年11月21日

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

      In order to search for low energy El strength, Coulomb excitation of the neutron rich nucleus 26Ne was studied at RIKEN Accelerator Research Facility. A 58 MeV/A secondary beam of 26Ne impinged on lead and aluminum target. In this complete kinematics measurement, we measured the energy and position of the charged fragments with a silicon strip/Si(Li) telescope, and the neutrons resulting from the decay of 26Ne with a multi-element plastic wall. The photons which can be emitted from excited states are detected using a 4π NaI array. The analysis is still in progress but it so far shows strength between 8 and 10 MeV excitation energy that can be related to a pygmy dipole resonance. © 2005 American Institute of Physics.

      DOI: 10.1063/1.2140651

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    • Intermediate-energy Coulomb excitation of the neutron-rich Ge isotopes around N = 50 査読有り

      H. Iwasaki, N. Aoi, S. Takeuchi, S. Ota, H. Sakurai, M. Tamaki, T. K. Onishi, E. Takeshita, H. J. Ong, N. Iwasa, H. Baba, Z. Elekes, T. Fukuchi, Y. Ichikawa, M. Ishihara, S. Kanno, R. Kanungo, S. Kawai, T. Kubo, K. Kurita, S. Michimasa, M. Niikura, A. Saito, Y. Satou, S. Shimoura, H. Suzuki, M. K. Suzuki, Y. Togano, Y. Yanagisawa, T. Motobayashi

      European Physical Journal A25 ( 1 ) 415 - 417   2005年9月

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      記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

      Structure of the neutron-rich Ge isotopes at and around N = 50 has been investigated via intermediate-energy Coulomb excitation using secondary beams of 78-82Ge incident on a Pb target. The B(E2) values for the low-lying 2+ states have been extracted and compared with the data for neighboring isotopes around N = 50. In addition, a new method of intermediate-energy two-step Coulomb excitation has been proposed as a spectroscopic tool to study the 4+ states in neutron-rich even-even nuclei. The first application of the method and its results are presented. © Società Italiana di Fisica / Springer-Verlag 2005.

      DOI: 10.1140/epjad/i2005-06-154-5

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      その他リンク: http://orcid.org/0000-0002-7291-7809

    • Study of 26Si(p,γ)27P reaction using Coulomb dissociation method 査読有り

      Y. Togano, T. Gomi, T. Motobayashi, Y. Ando, N. Aoi, H. Baba, K. Demichi, Z. Elekes, N. Fukuda, Zs Fülöp, U. Futakami, H. Hasegawa, Y. Higurashi, K. Ieki, N. Imai, M. Ishihara, K. Ishikawa, N. Iwasa, H. Iwasaki, S. Kanno, Y. Kondo, T. Kubo, S. Kubono, M. Kunibu, K. Kurita, Y. U. Matsuyama, S. Michimasa, T. Minemura, M. Miura, H. Murakami, T. Nakamura, M. Notani, S. Ota, A. Saito, H. Sakurai, M. Serata, S. Shimoura, T. Sugimoto, E. Takeshita, S. Takeuchi, K. Ue, K. Yamada, Y. Yanagisawa, K. Yoneda, A. Yoshida

      Nuclear Physics A758 ( 1-4 ) 182 - 185   2005年7月25日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier  

      The Coulomb dissociation of 27P was studied experimentally using 27P beams at 57 MeV/nucleon with a lead target. The E2 gamma decay width of the first excited state in 27P was extracted. Assuming the same E2/M1 mixing ratio as the one for the mirror nucleus 27Mg, the gamma decay width of the state, which is of astrophysical interest, is estimated to be ten times smaller than the value calculated by J. A. Caggiano et al. © 2005 Elsevier B.V. All rights reserved.

      DOI: 10.1016/j.nuclphysa.2005.05.035

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    • Study of the Si-26(p,gamma)P-27 reaction by the Coulomb dissociation method 査読有り

      Togano Y, Gomi T, Motobayashi T, Ando Y, Aoi N, Baba H, Demichi K, Elekes Z, Fukuda N, Fulop ZS, Futakami U, Hasegawa H, Higurashi Y, Ieki K, Imai N, Ishihara M, Ishikawa K, Iwasa N, Iwasaki H, Kanno S, Kondo Y, Kubo T, Kubono S, Kunibu M, Kurita K, Matsuyama YU, Michimasa S, Minemura T, Miura M, Murakami H, Nakamura T, Notani M, Ota S, Saito A, Sakurai H, Serata M, Shimoura S, Sugimoto T, Takeshita E, Takeuchi S, Ue K, Yamada K, Yanagisawa Y, Yoneda K, Yoshida A

      Origin of Matter & Evolution of Galaxies 2003   549 - 552   2005年

    • Bound excited states in 27F 査読有り 国際誌

      Z. Elekes, Zs. Dombrádi, A. Saito, N. Aoi, H. Baba, K. Demichi, Zs. Fülöp, J. Gibelin, T. Gomi, H. Hasegawa, N. Imai, M. Ishihara, H. Iwasaki, S. Kanno, S. Kawai, T. Kishida, T. Kubo, K. Kurita, Y. Matsuyama, S. Michimasa, T. Minemura, T. Motobayashi, M. Notani, T. Ohnishi, H. J. Ong, S. Ota, A. Ozawa, H. K. Sakai, H. Sakurai, S. Shimoura, E. Takeshita, S. Takeuchi, M. Tamaki, Y. Togano, K. Yamada, Y. Yanagisawa, K. Yoneda

      Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics599 ( 1-2 ) 17 - 22   2004年10月7日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)  

      The 1H( 27F, 25,26,27F) reactions have been studied at 40 MeV/nucleon average energy using a liquid hydrogen target. For 25F, 26F and 27F nuclei, we have observed two γ-ray peaks each originating from the decay of two bound excited states. This is the first sign of the existence of bound excited states in 26,27F. The presence of a single bound excited state in 27F is a clear indication of a substantial change in the structure of the fluorine isotopes approaching the neutron dripline. The proposed second excited states in 25,26,27F nuclei have no counterparts in either the psd or the sdpf shell model calculations suggesting the appearance of nuclear structure effects lying out of these model spaces. © 2004 Elsevier B.V. All rights reserved.

      DOI: 10.1016/j.physletb.2004.08.028

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    • 29pSG-10 クーロン励起法を用いた陽子過剰核 ^<46>Cr, ^<50>Fe, ^<54>Ni の B(E2) 測定 (II)(不安定核, 理論核物理)

      山田, 一成, 本林, 透, 青井, 考, 馬場, 秀忠, 出道, 仁彦, Elekes, Z, Gibelm, J, 五味, 朋子, 長谷川, 浩一, 今井, 伸明, 岩崎, 弘典, 菅野, 祥子, 久保, 敏幸, 栗田, 和好, 松山, 裕一, 道正, 新一郎, 峯村, 俊行, 野谷, 将広, 大西, 健夫, Ong, H J, 大田, 晋輔, 小沢, 顕, 齋藤, 明登, 櫻井, 博儀, 下浦, 享, 竹下, 英里, 武内, 聡, 玉城, 充, 栂野, 泰宏, 柳澤, 善行, 米田, 健一郎, 谷畑, 勇夫

      日本物理学会講演概要集59 ( 2 ) 42   2004年8月

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      記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:社団法人日本物理学会  

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    • Single-neutron knockout from C-20 and the structure of C-19 (vol 769, pg 503, 2017) 査読有り

      J. W. Hwang, S. Kim, Y. Satou, N. A. Orr, Y. Kondo, T. Nakamura, J. Gibelin, N. L. Achouri, T. Aumann, H. Baba, F. Delaunay, P. Doornenbal, N. Fukuda, N. Inabe, T. Isobe, D. Kameda, D. Kanno, N. Kobayashi, T. Kobayashi, T. Kubo, S. Leblond, J. f Lee, F. M. Marques, R. Minakata, T. Motobayashi, D. Murai, T. Murakami, K. Muto, T. Nakashima, N. Nakatsuka, A. Navin, S. Nishi, S. Ogoshi, H. Otsu, H. Sato, Y. Shimizu, H. Suzuki, K. Takahashi, H. Takeda, S. Takeuchi, R. Tanaka, Y. Togano, A. G. Tuff, M. Vandebrouck, K. Yoneda

      PHYSICS LETTERS B774   723 - 723   2017年11月

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      記述言語:英語   掲載種別:その他   出版者・発行元:ELSEVIER SCIENCE BV  

      DOI: 10.1016/j.physletb.2017.08.072

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    • 陽子・重陽子による<sup>91</sup>Y核破砕反応の同位体生成断面積測定

      諏訪純貴, 渡辺幸信, 川瀬頌一郎, 中野敬太, 金政浩, 荒木祥平, WANG He, 大津秀暁, 千賀信幸, 櫻井博儀, 栂野泰宏, 武内聡, 中村隆司, 前田幸重

      日本原子力学会春の年会予稿集(CD-ROM)2017   ROMBUNNO.3E11   2017年3月9日

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      記述言語:日本語  

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    • 逆運動学手法を用いた陽子・重陽子による核破砕反応の残留核生成断面積測定(1)実験目的と概要

      渡辺幸信, 川瀬頌一郎, 中野敬太, 荒木祥平, 金政浩, WANG He, 大津秀暁, 櫻井博儀, 武内聡, 栂野泰宏, 中村隆司, 前田幸重

      日本原子力学会春の年会予稿集(CD-ROM)2016   ROMBUNNO.2J11   2016年3月16日

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      記述言語:日本語  

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    • 逆運動学手法を用いた陽子・重陽子による核破砕反応の残留核生成断面積測定(2)100MeV/u<sup>93</sup>Zr入射反応

      川瀬頌一郎, 渡辺幸信, 中野敬太, 荒木祥平, 金政浩, WANG He, 大津秀暁, 櫻井博儀, 武内聡, 栂野泰宏, 中村隆司, 前田幸重

      日本原子力学会春の年会予稿集(CD-ROM)2016   ROMBUNNO.2J12   2016年3月16日

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      記述言語:日本語  

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    • 逆運動学的手法を用いた陽子・重陽子による核破砕反応の残留核生成断面積測定(3)100MeV/u<sup>93</sup>Nb入射反応

      中野敬太, 渡辺幸信, 川瀬頌一郎, 荒木祥平, 金政浩, WANG He, 大津秀暁, 櫻井博儀, 栂野泰宏, 武内聡, 中村隆司, 前田幸重

      日本原子力学会春の年会予稿集(CD-ROM)2016   ROMBUNNO.2J13   2016年3月16日

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    • 陽子・重陽子に対する100MeV/u<sup>93</sup>Zr入射核破砕反応による同位体生成断面積の測定

      川瀬頌一郎, 中野敬太, 荒木祥平, 金政浩, 渡辺幸信, 櫻井博儀, 櫻井博儀, 大津秀暁, WANG H, 中村隆司, 栂野泰宏, 武内聡, 前田幸重

      日本物理学会講演概要集(CD-ROM)70 ( 2 ) ROMBUNNO.28ASF-6   2015年9月24日

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      記述言語:日本語  

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    • Spectroscopy of Ne32 and the "island of Inversion"

      P. Doornenbal, H. Scheit, N. Aoi, S. Takeuchi, K. Li, E. Takeshita, H. Wang, H. Baba, S. Deguchi, N. Fukuda, H. Geissel, R. Gernhäuser, J. Gibelin, I. Hachiuma, Y. Hara, C. Hinke, N. Inabe, K. Itahashi, S. Itoh, D. Kameda, S. Kanno, Y. Kawada, N. Kobayashi, Y. Kondo, R. Krücken, T. Kubo, T. Kuboki, K. Kusaka, M. Lantz, S. Michimasa, T. Motobayashi, T. Nakamura, T. Nakao, K. Namihira, S. Nishimura, T. Ohnishi, M. Ohtake, N. A. Orr, H. Otsu, K. Ozeki, Y. Satou, S. Shimoura, T. Sumikama, M. Takechi, H. Takeda, K. N. Tanaka, K. Tanaka, Y. Togano, M. Winkler, Y. Yanagisawa, K. Yoneda, A. Yoshida, K. Yoshida, H. Sakurai

      Physical Review Letters103 ( 3 ) 032501/1-4   2009年8月6日

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      We report on the first spectroscopic study of the N=22 nucleus Ne32 at the newly completed RIKEN Radioactive Ion Beam Factory. A single γ-ray line with an energy of 722(9)keV was observed in both inelastic scattering of a 226MeV/u Ne32 beam on a carbon target and proton removal from Na33 at 245MeV/u. This transition is assigned to the deexcitation of the first Jπ=2+ state in Ne32 to the 0+ ground state. Interpreted through comparison with state-of-the-art shell-model calculations, the low excitation energy demonstrates that the "island of inversion" extends to at least N=22 for the Ne isotopes. © 2009 The American Physical Society.

      DOI: 10.1103/PhysRevLett.103.032501

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    • Spectroscopic study of neutron shell closures via nucleon transfer in the near-dripline nucleus O23

      Z. Elekes, Zs Dombrádi, N. Aoi, S. Bishop, Zs Fülöp, J. Gibelin, T. Gomi, Y. Hashimoto, N. Imai, N. Iwasa, H. Iwasaki, G. Kalinka, Y. Kondo, A. A. Korsheninnikov, K. Kurita, M. Kurokawa, N. Matsui, T. Motobayashi, T. Nakamura, T. Nakao, E. Yu Nikolskii, T. K. Ohnishi, T. Okumura, S. Ota, A. Perera, A. Saito, H. Sakurai, Y. Satou, D. Sohler, T. Sumikama, D. Suzuki, M. Suzuki, H. Takeda, S. Takeuchi, Y. Togano, Y. Yanagisawa

      Physical Review Letters98 ( 10 ) 102502/1-4   2007年3月8日

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      記述言語:英語  

      Neutron single particle energies have been measured in O23 using the O22(d,p)O*23→O22+n process. The energies of the resonant states have been deduced to be 4.00(2) MeV and 5.30(4) MeV. The first excited state can be assigned to the νd3/2 single particle state from a comparison with shell model calculations. The measured 4.0 MeV energy difference between the νs1/2 and νd3/2 states gives the size of the N=16 shell gap which is in agreement with the recent USD05 ("universal" sd from 2005) shell model calculation, and is large enough to explain the unbound nature of the oxygen isotopes heavier than A=24. The resonance detected at 5.3 MeV can be assigned to a state out of the sd shell model space. Its energy corresponds to a ∼1.3MeV sized N=20 shell gap, therefore, the N=20 shell closure disappears at Z=8 in agreement with Monte Carlo shell model calculations using SDPF-M interaction. © 2007 The American Physical Society.

      DOI: 10.1103/PhysRevLett.98.102502

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    • Testing of the RIKEN-ATOMKI CsI(Tl) array in the study of22,23O nuclear structure

      Z. Elekes, Zs Dombrádi, S. Bishop, Zs Fülöp, J. Gibelin, T. Gomi, Y. Hashimoto, N. Imai, N. Iwasa, H. Iwasaki, G. Kalinka, Y. Kondo, A. A. Korsheninnikov, K. Kurita, M. Kurokawa, N. Matsui, T. Motobayashi, T. Nakamura, T. Nakao, E. Yu Nikolskii, T. K. Ohnishi, T. Okumura, S. Ota, A. Perera, A. Saito, H. Sakurai, Y. Satou, D. Sohler, T. Sumikama, D. Suzuki, M. Suzuki, H. Takeda, S. Takeuchi, Y. Togano, Y. Yanagisawa

      European Physical Journal A27 ( 1 ) 321 - 324   2006年3月

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      記述言語:英語  

      The paper reports on the test of the newly developed RIKEN-ATOMKI CsI(Tl) array. It is demonstrated that high-quality detectors with excellent light collection efficiency and narrow resolution distribution could be produced. The setup has been commissioned in the study of the reaction of 22O + CD2. In the present paper, we summarize the results mainly on the (d, d′) channel. From the cross section for the transition between the ground state and the first 2+ state, we could deduce the "matter" deformation parameter to be βM = 0.23±0.02 by distorted wave analysis. Comparing this data with previous measurements it can be concluded that 22O isotope has moderate and similar neutron and proton deformations.

      DOI: 10.1140/epja/i2006-08-049-x

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    • Search for neutron decoupling in O22 via the (d,d'γ) reaction

      Z. Elekes, Zs Dombrádi, N. Aoi, S. Bishop, Zs Fülöp, J. Gibelin, T. Gomi, Y. Hashimoto, N. Imai, N. Iwasa, H. Iwasaki, G. Kalinka, Y. Kondo, A. A. Korsheninnikov, K. Kurita, M. Kurokawa, N. Matsui, T. Motobayashi, T. Nakamura, T. Nakao, E. Yu Nikolskii, T. K. Ohnishi, T. Okumura, S. Ota, A. Perera, A. Saito, H. Sakurai, Y. Satou, D. Sohler, T. Sumikama, D. Suzuki, M. Suzuki, H. Takeda, S. Takeuchi, Y. Togano, Y. Yanagisawa

      Physical Review C - Nuclear Physics74 ( 1 ) 017306   2006年

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      記述言語:英語  

      We have searched for valence neutron decoupling in O22, a phenomenon recently observed in neutron-rich C, B, and lighter O nuclei. From the cross section of the (d,d'γ) reaction for the transition between the ground state and the first 2+ state of O22, the neutron and proton deformation parameters have been deduced by distorted wave analysis using and reanalyzing the data of a previous Coulomb excitation measurement. The ratio of the neutron and proton multipole transition matrix elements Mn/Mp compared to the N/Z value has been derived to be around 1. This result indicates that the O22 isotope has small and similar neutron and proton deformations, which is consistent with N=14 shell closure. Thus, the concept of neutron decoupling does not hold for this nucleus. © 2006 The American Physical Society.

      DOI: 10.1103/PhysRevC.74.017306

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    講演・口頭発表等

    • Current status and future perspective of SAMURAI at RIBF 招待有り 国際会議

      Y. Togano

      RIBF Users Meeting  2020年9月8日  RIBF Users Group

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      記述言語:英語   会議種別:口頭発表(一般)  

      開催地:Online  

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    • Low-lying dipole strength in neutron-rich Ca isotopes 50,52Ca 国際会議

      Y. Togano, for, SAMURAI, collaboration

      African Nuclear Physics Conference  2019年7月1日  iTmemba Labs

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      記述言語:英語   会議種別:口頭発表(一般)  

      開催地:Mpumalanga, South Africa  

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    • Matter radius of two- neutron halo nucleus 22C 国際会議

      Y. Togano, for, SAMURAI Dayone collaboration

      13th International Conference on nucleus-nucleus collisions  2018年12月4日  RIKEN Nishina Center

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      記述言語:英語   会議種別:口頭発表(一般)  

      開催地:Saitama, Japan  

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    • New γ-ray detector CATANA for in-beam γ-ray spectroscopy with fast RI beams 国際会議

      Y. Togano, T. Nakamura, Y. Kondo, M. Shikata, T. Ozaki, A.T. Saito, T. Tomai, M. Yasuda, H. Yamada, N. Chiga, H. Otsu, V. Panin, Y. Zaihong, Y. Fujino

      The International Conference on Electromagnetic Isotope Separators and Related Topics  2018年9月16日  CERN

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      記述言語:英語   会議種別:ポスター発表  

      開催地:Geneva, Switzerland  

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    • Studies of 22C and 52Ca at SAMURAI 国際会議

      Y. Togano for, SAMURAI collaboration

      IX International Symposium on Exotic Nuclei  2018年9月10日  JINR, RIKEN, GANIL, GSI, NSCL, PetrSU

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      記述言語:英語   会議種別:口頭発表(一般)  

      開催地:Petrozavodsk, Russia  

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    • E1 responses of neutron-rich Ca isotopes 50Ca and 52Ca 国際会議

      Y. Togano, for, SAMURAI, collaboration

      10th International Conference on Direct Reactions with Exotic Beams  2018年6月4日  Tokyo Institute of Technology and RCNP, Osaka University

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      記述言語:英語   会議種別:口頭発表(一般)  

      開催地:Matsue, Japan  

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    • 22C反応断面積の高統計測定 招待有り

      栂野泰宏

      日本物理学会シンポジウム「反応断面積による陽子・中性子半径研究の進展」  2016年9月21日  日本物理学会

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      記述言語:日本語   会議種別:口頭発表(招待・特別)  

      開催地:宮崎大学  

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    • Reaction cross section of the two-neutron halo nucleus 22C at 235 MeV/nucleon 国際会議

      Y. Togano, for, SAMURAI Dayone collaboration

      International Nuclear Physics Conference  2016年9月11日  The university of Adelaide

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      記述言語:英語   会議種別:口頭発表(一般)  

      開催地:Adelaide, Australia  

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    共同研究・競争的資金等の研究

    • 量子クラスターで読み解く物質の階層構造

      文部科学省  科学研究費助成事業 

      中村隆司

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      2018年4月 - 現在

      資金種別:競争的資金

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    • 中性子星元素合成解明のための新手法を用いた中性子捕獲反応率決定

      日本学術振興会  科学研究費助成事業 基盤研究(B) 

      栂野 泰宏, 中村 隆司

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      2021年4月 - 2024年3月

      課題番号:21H01114

      担当区分:研究代表者 

      配分額:18200000円 ( 直接経費:14000000円 、 間接経費:4200000円 )

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    • 無機シンチレータを用いた陽子のエネルギーと粒子弁別の研究

      立教大学  立教大学学術推進特別重点資金(立教SFR) 

      栂野泰宏

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      2019年4月 - 2020年3月

      担当区分:研究代表者  資金種別:競争的資金

      配分額:960000円 ( 直接経費:960000円 )

      無機シンチレータCsI(Na)の出力波形を用いた粒子弁別と、100MeVの陽子のエネルギーの測定精度を決定する研究

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    • 中性子過剰な中低密度核物質の物性

      日本学術振興会  科学研究費助成事業 新学術領域研究(研究領域提案型) 

      中村 隆司, 下浦 享, 近藤 洋介, 寺西 高, 栂野 泰宏, 小林 信之, 大津 秀暁

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      2012年6月 - 2017年3月

      課題番号:24105005

      配分額:210990000円 ( 直接経費:162300000円 、 間接経費:48690000円 )

      中性子星核物質の性質を解明するため、不安定核を用いた実験により中性子過剰環境下での原子核の物性を明らかにした。(1)γ線カロリメータを建設し、中性子過剰Ca核のピグミー共鳴を測定した。(2) 中性子ハロー核のクーロン分解によりダイニュートロンの兆候を示す強い双極子励起を観測し、31Ne等に変形誘因型ハローを発見した。(3) 不安定核の荷電交換反応を用いてテトラ中性子の候補を発見した。また、26Oの質量を測定し、僅かに非束縛の状態であることを見いだし、28Oの実験にも成功した。以上の結果、中性子過剰環境下での核力や量子多体効果の理論に制限が加わり、中性子星の解明が進むものと期待される。

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    • 高速不安定核ビームを用いたp核生成にかかわる天体各反応断面積の決定

      日本学術振興会  科学研究費助成事業 

      米田健一郎

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      2010年4月 - 2012年3月

      資金種別:競争的資金

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    • クーロン分解反応による不安定Ni,Ge同位体の陽子捕獲反応断面積の決定

      日本学術振興会  科学研究費助成事業 

      栂野泰宏

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      2009年4月 - 2011年3月

      担当区分:研究代表者  資金種別:競争的資金

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    • クーロン分解法による硫黄同位体の陽子捕獲反応断面積の決定

      日本学術振興会  科学研究費助成事業 

      栂野泰宏

      詳細を見る

      2005年4月 - 2008年3月

      担当区分:研究代表者  資金種別:競争的資金

      クーロン分解法を用いて天体核反応30S(p,gamma)31Clの反応率を決定する。特に散乱粒子の超前方を測定することで、これまででは不可能であったM1励起成分の寄与を確定した

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