Researcher Profile - IEKI Kazuo

写真b

IEKI Kazuo

*Items subject to periodic update by Rikkyo University (The rest are reprinted from information registered on researchmap.)

Affiliation*

Professor Emeritus

Title*

Professor Emeritus

Degree

理学博士（京都大学）

Research Interests

偏極

天体核物理

中性子測定

NUCLEAR PHYSICS

Campus Career*

4 2022 - Present

Professor Emeritus

External Link

Research Areas

Natural Science / Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics

Research History

4 2016 - 3 2020

RIKKYO UNIVERSITY Director

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4 1998 - 3 2020

RIKKYO UNIVERSITY Graduate School of Science Field of Study: Physics Professor

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4 1998 - 3 2020

RIKKYO UNIVERSITY Graduate School of Science Field of Study: Physics Professor

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4 1998 - 3 2020

RIKKYO UNIVERSITY College of Science Department of Physics Professor

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4 2011 - 3 2015

RIKKYO UNIVERSITY College of Science Manager(Dean)

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4 2011 - 3 2015

RIKKYO UNIVERSITY Graduate School of Science Chairman Director

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4 2011 - 3 2013

RIKKYO UNIVERSITY Head

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4 2007 - 3 2013

RIKKYO UNIVERSITY

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4 2011 - 9 2012

RIKKYO UNIVERSITY Center for Development and Support of Higher Education Director

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4 2009 - 3 2011

RIKKYO UNIVERSITY Division of Academic Affairs Director

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4 2009 - 3 2011

RIKKYO UNIVERSITY Head

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4 2007 - 3 2009

RIKKYO UNIVERSITY Head

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5 2006 - 6 2008

RIKKYO UNIVERSITY Person in Charge of Generalization

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4 2004 - 3 2005

RIKKYO UNIVERSITY Media Center Director

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4 2002 - 3 2004

RIKKYO UNIVERSITY Media Center Director

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4 2003 - 5 2003

RIKKYO UNIVERSITY Media Center Section Chief

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4 2003 - 5 2003

RIKKYO UNIVERSITY Office of the President Assistant to The Director

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4 2000 - 3 2002

RIKKYO UNIVERSITY Media Center Director

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4 1999 - 3 2000

RIKKYO UNIVERSITY Chief Adviser to the President

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4 1998 - 3 1999

RIKKYO UNIVERSITY College of Science Department of Physics Chairman

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4 1990 - 3 1998

RIKKYO UNIVERSITY College of Science Department of Physics Associate Professor (as old post name)

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4 1994 - 3 1995

RIKKYO UNIVERSITY College of Science Department of Physics Chairman

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4 1987 - 3 1990

RIKKYO UNIVERSITY College of Science Department of Physics Lecturer

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5 1983 - 3 1987

Tokyo Institute of Technology School of Science, Dept. of Physics

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4 1983 - 5 1983

日本学術振興会日本学術振興会研究員（リサーチ・アソシエイト）

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Education

- 3 1983

Kyoto University Graduate School, Division of Natural Science

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Country： Japan

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- 3 1978

Kyoto University Faculty of Science

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Country： Japan

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Committee Memberships

3 2009 - 3 2009

日本物理学会第64回年次大会実行委員長

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Committee type：Academic society

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9 2002 - 9 2002

日本物理学会 2002年秋季大会実行委員会副委員長

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Committee type：Academic society

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Awards

7 2008

日本物理学会 JSPS Papers of Editors' Choice

T.Ohnishi, T.Kubo

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Award type：International academic award (Japan or overseas) Country：Japan

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Papers

Rapidity distributions of Z = 1 isotopes and the nuclear symmetry energy from Sn+Sn collisions with radioactive beams at 270 MeV/nucleon Peer-reviewed

M. Kaneko, T. Murakami, T. Isobe, M. Kurata-Nishimura, A. Ono, N. Ikeno, J. Barney, G. Cerizza, J. Estee, G. Jhang, J.W. Lee, W.G. Lynch, C. Santamaria, C.Y. Tsang, M.B. Tsang, R. Wang, D.S. Ahn, L. Atar, T. Aumann, H. Baba, K. Boretzky, J. Brzychczyk, N. Chiga, N. Fukuda, I. Gašparić, B. Hong, A. Horvat, T. Ichihara, K. Ieki, N. Inabe, Y.J. Kim, T. Kobayashi, Y. Kondo, P. Lasko, H.S. Lee, Y. Leifels, J. Łukasik, J. Manfredi, A.B. McIntosh, P. Morfouace, T. Nakamura, N. Nakatsuka, S. Nishimura, R. Olsen, H. Otsu, P. Pawłowski, K. Pelczar, D. Rossi, H. Sakurai, H. Sato, H. Scheit, R. Shane, Y. Shimizu, H. Simon, T. Sumikama, D. Suzuki, H. Suzuki, H. Takeda, S. Tangwancharoen, Y. Togano, H. Törnqvist, Z. Xiao, S.J. Yennello, J. Yurkon, Y. Zhang

Physics Letters B822 136681-1 - 136681-8 11 2021

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Publishing type：Research paper (scientific journal) Publisher：Elsevier BV

DOI： 10.1016/j.physletb.2021.136681

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Probing the Symmetry Energy with the Spectral Pion Ratio Peer-reviewed

Estee, J., Lynch, W. G., Tsang, C. Y., Barney, J., Jhang, G., Tsang, M. B., Wang, R., Kaneko, M., Lee, J. W., Isobe, T., Kurata-Nishimura, M., Murakami, T., Ahn, D. S., Atar, L., Aumann, T., Baba, H., Boretzky, K., Brzychczyk, J., Cerizza, G., Chiga, N., Fukuda, N., Gasparic, I, Hong, B., Horvat, A., Ieki, K., Inabe, N., Kim, Y. J., Kobayashi, T., Kondo, Y., Lasko, P., Lee, H. S., Leifels, Y., Lukasik, J., Manfredi, J., McIntosh, A. B., Morfouace, P., Nakamura, T., Nakatsuka, N., Nishimura, S., Otsu, H., Pawlowski, P., Pelczar, K., Rossi, D., Sakurai, H., Santamaria, C., Sato, H., Scheit, H., Shane, R., Shimizu, Y., Simon, H., Snoch, A., Sochocka, A., Sumikama, T., Suzuki, H., Suzuki, D., Takeda, H., Tangwancharoen, S., Toernqvist, H., Togano, Y., Xiao, Z. G., Yennello, S. J., Zhang, Y., Cozma, M. D.

Physical Review Letters 2021

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Publishing type：Research paper (scientific journal)

DOI： 10.1103/PHYSREVLETT.126.162701

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Three-body breakup of 6He and its halo structure

Sun, Y.L., Nakamura, T., Kondo, Y., Satou, Y., Lee, J., Matsumoto, T., Ogata, K., Kikuchi, Y., Aoi, N., Ichikawa, Y., Ieki, K., Ishihara, M., Kobayshi, T., Motobayashi, T., Otsu, H., Sakurai, H., Shimamura, T., Shimoura, S., Shinohara, T., Sugimoto, T., Takeuchi, S., Togano, Y., Yoneda, K.

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics814 136072 - 136072 2021

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Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier {BV}

DOI： 10.1016/j.physletb.2021.136072

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Low-lying dipole response in the unstable Ni 70 nucleus Peer-reviewed

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 ) 11 12 2018

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Publishing type：Research paper (scientific journal)

© 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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Proton single particle energies next to 78Ni: Spectroscopy of 77Cu via single proton knock-out reaction Peer-reviewed

Zs Vajta, D. Sohler, Y. Shiga, K. Yoneda, K. Sieja, D. Steppenbeck, Zs Dombrádi, N. Aoi, P. Doornenbal, J. Lee, H. Liu, M. Matsushita, S. Takeuchi, H. Wang, H. Baba, P. Bednarczyk, Zs Fülöp, S. Go, T. Hashimoto, E. Ideguchi, K. Ieki, K. Kobayashi, Y. Kondo, R. Minakata, T. Motobayashi, D. Nishimura, H. Otsu, H. Sakurai, Y. Sun, A. Tamaii, R. Tanaka, Z. Tian, T. Yamamoto, X. Yang, Z. Yang, Y. Ye, R. Yokoyama, J. Zenihiro

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics782 99 - 103 10 7 2018

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Language：English Publishing type：Research paper (scientific journal)

Excited states of Cu have been investigated by use of single proton knock-out reaction at the Radioactive Isotope Beam Factory in RIKEN in order to reveal the main components of the proton single-particle states. Three excited states were observed at 271, 902 and 2068 keV in Cu. The lowest-energy excited state follows the trend predicted for the crossing of the 3/2 and 5/2 states. Comparing the excitation energies of the 3/2 , 5/2 and 7/2 levels from Cu to Cu one can see that the Z=28 shell gap between the p and f states is rather stable, while the f −f spin–orbit splitting decreases by ∼1.5 MeV in agreement with shell model calculations using the tensor force. 77 77 − − − − − 69 77 1 1 3/2 7/2 5/2 7/2

DOI： 10.1016/j.physletb.2018.05.023

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Identification of New Neutron-Rich Isotopes in the Rare-Earth Region Produced by 345MeV/nucleon U-238 Peer-reviewed

Fukuda Naoki, Kubo Toshiyuki, Kameda Daisuke, Inabe Naohito, Suzuki Hiroshi, Shimizu Yohei, Takeda Hiroyuki, Kusaka Kensuke, Yanagisawa Yoshiyuki, Ohtake Masao, Tanaka Kanenobu, Yoshida Koichi, Sato Hiromi, Baba Hidetada, Kurokawa Meiko, Ohnishi Tetsuya, Iwasa Naohito, Chiba Ayuko, Yamada Taku, Ideguchi Eiji, Go Shintaro, Yokoyama Rin, Fujii Toshihiko, Nishibata Hiroki, Ieki Kazuo, Murai Daichi, Momota Sadao, Nishimura Daiki, Sato Yoshiteru, Hwang Jongwon, Kim Sunji, Tarasov Oleg B, Morrissey David J, Simpson Gary

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN87 ( 1 ) 15 1 2018

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DOI： 10.7566/JPSJ.87.014202

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Observation of isoscalar and isovector dipole excitations in neutron-rich O-20

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 5 2017

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Language：English Publishing type：Research paper (scientific journal) Publisher：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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Proton-proton correlations in distinguishing the two-proton emission mechanism of Al 23 and Mg 22

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 28 10 2016

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© 2016 American Physical Society. The proton-proton momentum correlation functions [Cpp(q)] for the kinematically complete decay channels Al23→p+p+Na21 and Mg22→p+p+Ne20 have been measured at the RIKEN RI Beam Factory. From the very different correlation strength of Cpp(q) for Al23 and Mg22, the source size and emission time information were extracted from the Cpp(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 Al23 was mainly sequential emission, while that of Mg22 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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Investigating nuclear shell structure in the vicinity of Ni-78: Low-lying excited states in the neutron-rich isotopes Zn-80,Zn-82 (vol 93, 024320, 2016) Peer-reviewed

Y. Shiga, K. Yoneda, D. Steppenbeck, N. Aoi, P. Doornenbal, J. Lee, H. Liu, M. Matsushita, S. Takeuchi, H. Wang, H. Baba, P. Bednarczyk, Zs. Dombradi, Zs. Fulop, S. Go, T. Hashimoto, M. Honma, E. Ideguchi, K. Ieki, K. Kobayashi, Y. Kondo, R. Minakata, T. Motobayashi, D. Nishimura, T. Otsuka, H. Otsu, H. Sakurai, N. Shimizu, D. Sohler, Y. Sun, A. Tamii, R. Tanaka, Z. Tian, Y. Tsunoda, Zs. Vajta, T. Yamamoto, X. Yang, Z. Yang, Y. Ye, R. Yokoyama, J. Zenihiro

PHYSICAL REVIEW C93 ( 4 ) 4 2016

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Language：English Publisher：AMER PHYSICAL SOC

DOI： 10.1103/PhysRevC.93.049904

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Investigating nuclear shell structure in the vicinity of Ni-78: Low-lying excited states in the neutron-rich isotopes Zn-80,Zn-82 Peer-reviewed

Y. Shiga, K. Yoneda, D. Steppenbeck, N. Aoi, P. Doornenbal, J. Lee, H. Liu, M. Matsushita, S. Takeuchi, H. Wang, H. Baba, P. Bednarczyk, Zs. Dombradi, Zs. Fulop, S. Go, T. Hashimoto, M. Honma, E. Ideguchi, K. Ieki, K. Kobayashi, Y. Kondo, R. Minakata, T. Motobayashi, D. Nishimura, T. Otsuka, H. Otsu, H. Sakurai, N. Shimizu, D. Sohler, Y. Sun, A. Tamii, R. Tanaka, Z. Tian, Y. Tsunoda, Zs. Vajta, T. Yamamoto, X. Yang, Z. Yang, Y. Ye, R. Yokoyama, J. Zenihiro

PHYSICAL REVIEW C93 ( 2 ) 024320 2 2016

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Language：English Publishing type：Research paper (scientific journal) Publisher：AMER PHYSICAL SOC

The low-lying level structures of nuclei in the vicinity of Ni-78 were investigated using in-beam gamma-ray spectroscopy to clarify the nature of the nuclear magic numbers Z = 28 and N = 50 in systems close to the neutron drip line. Nucleon knockout reactions were employed to populate excited states in Zn-80 and Zn-82. A candidate for the 4(1)(+) level in Zn-80 was identified at 1979(30) keV, and the lifetime of this state was estimated to be 136(-67)(+92) ps from a line-shape analysis. Moreover, the energy of the 2(1)(+) state in Zn-82 is reported to lie at 621(11) keV. The large drop in the 2(1)(+) energy at Zn-82 indicates the presence of a significant peak in the E(2(1)(+)) systematics at N = 50. Furthermore, the E(4(1)(+))/E(2(1)(+)) and B(E2; 4(1)(+) -> 2(1)(+))/B(E2; 2(1)(+) -> 0(g.s.)(+)) ratios in Zn-80 were deduced to be 1.32(3) and 1.12(-60)(+80), respectively. These results imply that Zn-80 can be described in terms of two-proton configurations with a 78Ni core and are consistent with a robust N = 50 magic number along the Zn isotopic chain. These observations, therefore, indicate a persistent N = 50 shell closure in nuclei far from the line of beta stability, which in turn suggests a doubly magic structure for Ni-78.

DOI： 10.1103/PhysRevC.93.024320

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20pAX-5 Search for Neutron Drip-line using High-intensity ^<48>Ca Beam II

Murai D., Ieki K., Kubo T., Inabe N., Fukuda N., Takeda H., Suzuki H., Ahn D. S., Shimizu Y., Sato H., Sato Y., Kusaka K., Yanagisawa Y., Ohtake M., Yoshida K., Otsu H., Iwasa N., Nakamura T., Tarasov Oleg B., Sherrill Brad M., Morrissey Dave J., Geissel Hans

Meeting Abstracts of the Physical Society of Japan71 331 - 331 2016

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Language：Japanese Publisher：The Physical Society of Japan (JPS)

DOI： 10.11316/jpsgaiyo.71.1.0_331

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Measurement of proton-induced target fragmentation cross sectionsin carbon Peer-reviewed

K.Matsushitaa, T.Nishio, S.Tanaka, M.Tsuneda, A.Sugiura, K.Ieki

Nuclear Physics A946 104 - 116 27 11 2015

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Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier

In proton therapy, positron emitter nuclei are generated via the target nuclear fragmentation reactions between irradiated proton and nuclei constituting a human body. The proton-irradiated volume can be con-firmed with measurement of annihilation γ-rays from the generated positron emitter nuclei. To achieve the high accuracy of proton therapy, in vivo dosimetry,i.e., evaluation of the irradiated dose during the treat-ment is important. To convert the measured activity distribution to irradiated dose, cross-sectionaldata for positron emitter production is necessary, which is currently insufficient in the treatment area. The purpose of this study is to collect cross-sectionaldata of 12C(p, pn)11Cand 12C(p, p2n)10Creactions between the incident proton and carbon nuclei, which are important target nuclear fragmentation reactions, to estimate the range and exposure dose distribution in the patient’s body. Using planar-type PET capable of measuring annihilation γ-rays at high positional resolution and thick polyethylene target, we measured cross-sectionaldata in continuous wide energy range. The cross section of 12C(p, pn)11Cis in good agreement with exist-ing experimental data. The cross section of 12C(p, p2n)10Cis reported for the first data in the low-energyrange of 67.6–10.5MeV near the Bragg peakof proton beam.

DOI： 10.1016/j.nuclphysa.2015.11.0070375-9474

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S pi RIT: A time-projection chamber for symmetry-energy studies Peer-reviewed

R. Shane, A. B. McIntosh, T. Isobe, W. G. Lynch, H. Baba, J. Barney, Z. Chajecki, M. Chartier, J. Estee, M. Famiano, B. Hong, K. Ieki, G. Jhang, R. Lemmon, F. Lu, T. Murakami, N. Nakatsuka, M. Nishimura, R. Olsen, W. Powell, H. Sakurai, A. Taketani, S. Tangwancharoen, M. B. Tsang, T. Usukura, R. Wang, S. J. Yennello, J. Yurkon

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT784 513 - 517 6 2015

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Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

A time-projection chamber (TPC) called the SAMURAI Pion-Reconstruction and Ion-Tracker (S pi RIT) has recently been constructed at Michigan State University as part of an international effort to constrain the symmetry-energy term in the nuclear Equation of State (EoS). The S pi RIT TPC will be used in conjunction with the SAMURAI spectrometer at the Radioactive Isotope Beam Factory (RIBF) at RIKEN to measure yield ratios for pions and other light isospin multiplets produced in central collisions of neutron-rich heavy ions, such as Sn-132+Sn-124. The S pi RIT TPC can function both as a TPC detector and as an active target. It has a vertical drift length of 50 cm, parallel to the magnetic field. Gas multiplication is achieved through the use of a multi-wire anode plane. Image charges, produced in the 12096 pads, are read out with the recently developed Generic Electronics for TPCs. (C) 2015 Published by Elsevier B.V.

DOI： 10.1016/j.nima.2015.01.026

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Different mechanism of two-proton emission from proton-rich nuclei23Al and22Mg

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, Section B: Nuclear, Elementary Particle and High-Energy Physics743 306 - 309 9 4 2015

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© 2015 The Authors. Two-proton relative momentum (qpp) and opening angle (θpp) distributions from the three-body decay of two excited proton-rich nuclei, namely Al23→p+p+Na21 and Mg22→p+p+Ne20, have been measured with the projectile fragment separator (RIPS) at the RIKEN RI Beam Factory. An evident peak at qpp20MeV/cas well as a peak in θpparound 30° are seen in the two-proton break-up channel from a highly-excited22Mg. In contrast, such peaks are absent for the23Al case. It is concluded that the two-proton emission mechanism of excited22Mg is quite different from the23Al case, with the former having a favorable diproton emission component at a highly excited state and the latter dominated by the sequential decay process.

DOI： 10.1016/j.physletb.2015.02.066

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25aSF-2 Search for Fluorine Neutron Drip-line using High-intensity ^<48>Ca Beam

Murai D., Ieki K., Kubo T., Inabe N., Fukuda N., Takeda H., Suzuki H., Ahn D.S., Shimizu Y., Sato H., Sato Y., Kusaka K., Yanagisawa Y., Ohtake M., Yoshida K., Otsu H., Iwasa N., Nakamura T., Tarasov Oleg B., Sherrill Brad M., Morrissey Dave J., Geissel Hans

Meeting Abstracts of the Physical Society of Japan70 213 - 213 2015

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Language：Japanese Publisher：The Physical Society of Japan (JPS)

DOI： 10.11316/jpsgaiyo.70.2.0_213

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In-beam γ -ray spectroscopy of 38,40,42Si Peer-reviewed

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

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Publishing type：Research paper (international conference proceedings)

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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In-beam gamma-ray spectroscopy of Si-38,Si-40,Si-42 Peer-reviewed

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

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：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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Determining the Li-7(n,gamma) cross section via Coulomb dissociation of Li-8 Peer-reviewed

R. Izsak, A. Horvath, A. Kiss, Z. Seres, A. Galonsky, C. A. Bertulani, Zs. Fueloep, T. Baumann, D. Bazin, K. Ieki, C. Bordeanu, N. Carlin, M. Csanad, F. Deak, P. DeYoung, N. Frank, T. Fukuchi, A. Gade, D. Galaviz, C. R. Hoffman, W. A. Peters, H. Schelin, M. Thoennessen, G. I. Veres

PHYSICAL REVIEW C88 ( 6 ) 065808 12 2013

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Language：English Publishing type：Research paper (scientific journal) Publisher：AMER PHYSICAL SOC

The applicability of Coulomb dissociation reactions to determine the cross section for the inverse neutron capture reaction was explored using the reaction Li-8(gamma,n)Li-7. A 69.5 MeV/nucleon Li-8 beam was incident on a Pb target, and the outgoing neutron and Li-7 nucleus were measured in coincidence. The deduced (n,gamma) excitation function is consistent with data for the direct capture reaction Li-7(n,gamma) Li-8 and with low-energy effective field theory calculations.

DOI： 10.1103/PhysRevC.88.065808

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Collectivity of neutron-rich Ti isotopes Peer-reviewed

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 8 2013

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Language：English Publishing type：Research paper (scientific journal) Publisher：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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Observation of new microsecond isomers among fission products from in-flight fission of 345 MeV/nucleon U-238 Peer-reviewed

D. Kameda, T. Kubo, T. Ohnishi, K. Kusaka, A. Yoshida, K. Yoshida, M. Ohtake, N. Fukuda, H. Takeda, K. Tanaka, N. Inabe, Y. Yanagisawa, Y. Gono, H. Watanabe, H. Otsu, H. Baba, T. Ichihara, Y. Yamaguchi, M. Takechi, S. Nishimura, H. Ueno, A. Yoshimi, H. Sakurai, T. Motobayashi, T. Nakao, Y. Mizoi, M. Matsushita, K. Ieki, N. Kobayashi, K. Tanaka, Y. Kawada, N. Tanaka, S. Deguchi, Y. Satou, Y. Kondo, T. Nakamura, K. Yoshinaga, C. Ishii, H. Yoshii, Y. Miyashita, N. Uematsu, Y. Shiraki, T. Sumikama, J. Chiba, E. Ideguchi, A. Saito, T. Yamaguchi, I. Hachiuma, T. Suzuki, T. Moriguchi, A. Ozawa, T. Ohtsubo, M. A. Famiano, H. Geissel, A. S. Nettleton, O. B. Tarasov, D. Bazin, B. M. Sherrill, S. L. Manikonda, J. A. Nolen

PHYSICAL REVIEW C86 ( 5 ) 054319 11 2012

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Language：English Publishing type：Research paper (scientific journal) Publisher：AMER PHYSICAL SOC

A search for isomeric gamma decays among fission fragments from 345 MeV/nucleon U-238 has been performed at the RIKEN Nishina Center RI Beam Factory. Fission fragments were selected and identified using the superconducting in-flight separator BigRIPS and were implanted in an aluminum stopper. Delayed gamma rays were detected using three clover-type high-purity germanium detectors located at the focal plane within a time window of 20 mu s following the implantation. We identified a total of 54 microsecond isomers with half-lives of similar to 0.1-10 mu s, including the discovery of 18 new isomers in very neutron-rich nuclei: Ti-59(m), As-90(m), Se-92(m), Se-93(m), Br-94(m), Br-95(m), Br-96(m), Rb-97(m), Nb-108(m), Mo-109(m), Ru-117(m), Ru-119(m), Rh-120(m), Rh-122(m), Pd-121(m), Pd-124(m), Ag-124(m), and Ag-126(m), and obtained a wealth of spectroscopic information such as half-lives, gamma-ray energies, gamma-ray relative intensities, and gamma gamma coincidences over a wide range of neutron-rich exotic nuclei. Proposed level schemes are presented for Ti-59(m), Ga-82(m), Br-92(m), Br-94(m), Br-95(m), Rb-97(m), Rb-98(m), Nb-108(m), Zr-108(m), Mo-109(m), Ru-117(m), Ru-119(m), Rh-120(m), Rh-122(m), Pd-121(m), Ag-124(m), and Ag-125(m), based on the obtained spectroscopic information and the systematics in neighboring nuclei. The nature of the nuclear isomerism is discussed in relation to the evolution of nuclear structure.

DOI： 10.1103/PhysRevC.86.054319

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Hindered Proton Collectivity in S-28(16)12: Possible Magic Number at Z=16 Peer-reviewed

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 5 2012

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Language：English Publishing type：Research paper (scientific journal) Publisher：AMER PHYSICAL SOC

The reduced transition probability B(E2; 0(gs)(+) -> 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)(+) -> 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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Hindered Proton Collectivity in the Proton-rich Nucleus S-28: Possible Magic Number Z=16 Peer-reviewed

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

NUCLEAR STRUCTURE AND DYNAMICS '121491 71 - 74 2012

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DOI： 10.1063/1.4764205

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Resonance states in P-27 using Coulomb dissociation and their effect on the stellar reaction Si-26(p,gamma) P-27 Peer-reviewed

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 9 2011

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Language：English Publishing type：Research paper (scientific journal) Publisher：AMER PHYSICAL SOC

The stellar reaction Si-26(p,gamma) P-27 was studied in the Coulomb dissociation of P-27. Two known resonance levels in P-27 were excited and a candidate for the third excited state was found in the Si-26 p relative energy spectrum. The E2 resonance strengths omega gamma were obtained to be (6.5 +/- 1.3) x 10(-11), (6.0 +/- 1.1) x 10(-10), and (1.10 +/- 0.27) x 10(-10) MeV. The total (E2 + M1)omega gamma value for the first excited state was evaluated to be 1.9(-1.1)(+1.9) x 10(-9) MeV with the help of the shell model. The error was estimated from the deviation of theoretical predictions with the same shell model from experimental strengths obtained in the present study for P-27 and earlier ones for the mirror nucleus Mg-27. The astrophysical reaction rate for the Si-26(p,gamma) P-27 reaction was also calculated and compared with previous estimations.

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 Peer-reviewed

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 8 2011

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Language：English Publishing type：Research paper (scientific journal) Publisher：SCIENCE PRESS

Two-proton relative momentum distributions from the break-up channels Al-23 -> p+p+Na-21 and Mg-22 -> 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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Experimental Investigation of the Stellar Reaction S-30(p, gamma)Cl-31 via Coulomb Dissociation Peer-reviewed

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

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：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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Identification of 45 New Neutron-Rich Isotopes Produced by In-Flight Fission of a U-238 Beam at 345 MeV/nucleon Peer-reviewed

Tetsuya Ohnishi, Toshiyuki Kubo, Kensuke Kusaka, Atsushi Yoshida, Koichi Yoshida, Masao Ohtake, Naoki Fukuda, Hiroyuki Takeda, Daisuke Kameda, Kanenobu Tanaka, Naohito Inabe, Yoshiyuki Yanagisawa, Yasuyuki Gono, Hiroshi Watanabe, Hideaki Otsu, Hidetada Baba, Takashi Ichihara, Yoshitaka Yamaguchi, Maya Takechi, Shunji Nishimura, Hideki Ueno, Akihiro Yoshimi, Hiroyoshi Sakurai, Tohru Motobayashi, Taro Nakao, Yutaka Mizoi, Masafumi Matsushita, Kazuo Ieki, Nobuyuki Kobayashi, Kana Tanaka, Yosuke Kawada, Naoki Tanaka, Shigeki Deguchi, Yoshiteru Satou, Yosuke Kondo, Takashi Nakamura, Kenta Yoshinaga, Chihiro Ishii, Hideakira Yoshii, Yuki Miyashita, Nobuya Uematsu, Yasutsugu Shiraki, Toshiyuki Sumikama, Junsei Chiba, Eiji Ideguchi, Akito Saito, Takayuki Yamaguchi, Isao Hachiuma, Takeshi Suzuki, Tetsuaki Moriguchi, Akira Ozawa, Takashi Ohtsubo, Michael A. Famiano, Hans Geissel, Anthony S. Nettleton, Oleg B. Tarasov, Daniel P. Bazin, Bradley M. Sherrill, Shashikant L. Manikonda, Jerry A. Nolen

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN79 ( 7 ) 073201 7 2010

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Language：English Publishing type：Research paper (scientific journal) Publisher：PHYSICAL SOC JAPAN

A search for new isotopes using in-flight fission of a 345 MeV/nucleon U-238 beam has been carried out at the RI Beam Factory at the RIKEN Nishina Center. Fission fragments were analyzed and identified by using the superconducting in-flight separator BigRIPS. We observed 45 new neutron-rich isotopes: Mn-71, Fe-73,Fe-74, Co-76, Ni-79, Cu-81,Cu-82, Zn-84,Zn-85, Ga-87, Ge-90, Se-95, Br-98, Kr-101, Rb-103, Sr-106,Sr-107, Y-108,Y-109, Zr-111,Zr-112, Nb-114,Nb-115, Mo-115,Mo-116,Mo-117, Tc-119,Tc-120, (121,122,123),Ru-124, Rh-123,Rh-124,Rh-125,Rh-126, Pd-127,Pd-128, Cd-133, Sn-138, Sb-140, Te-143, I-145, Xe-148, and Ba-152.

DOI： 10.1143/JPSJ.79.073201

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Astrophysical reaction rate of 30S(p, γ)31Cl studied by Coulomb dissociation Peer-reviewed

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

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Publishing type：Research paper (international conference proceedings)

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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THE He-6+He-6 AND alpha+He-8 CLUSTER STATES IN Be-12 VIA alpha-INELASTIC SCATTERING Peer-reviewed

Saito A, Shimoura S, Minemura T, Matsuyama Y, U, Baba H, Aoi N, Gomi T, Higurashi Y, Ieki K, Imai N, Iwasa N, Iwasaki H, Kanno S, Kubono S, Kunibu M, Michimasa S, Motobayashi T, Nakamura T, Ryuto H, Sakurai H, Serata M, Takeshita E, Takeuchi S, Teranishi T, Ue K, Yamada K, Yanagisawa Y

Modern Physics Letters a25 ( 21-23 ) 1858 - 1861 2010

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DOI： 10.1142/S0217732310000496

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SIGNALS OF DIPROTON EMISSION FROM THE THREE BODY BREAKUP CHANNEL OF (23)AL AND (22)MG Peer-reviewed

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

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Measurement on proton-proton correlation of the excited Al-23 Peer-reviewed

Ma Y. G, Fang D. Q, Zhou P, Cai X. Z, Chen J. G, Guo W, Sun X. Y, 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 Physics Trends1235 377 - + 2010

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DOI： 10.1063/1.3442626

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MEASUREMENT OF TWO-PROTON CORRELATION FROM THE BREAK-UP OF Al-23 Peer-reviewed

Zhou P, Fang D. Q, Ma Y. G, Cai X. Z, Chen J. G, Guo W, Sun X. Y, 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

International Journal of Modern Physics E-Nuclear Physics19 ( 5-6 ) 957 - 964 2010

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DOI： 10.1142/S0218301310015400

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MEASUREMENT OF THE PROTON-PROTON CORRELATION FUNCTION FROM THE BREAK-UP OF Mg-22 AND Ne-20 Peer-reviewed

Sun X. Y, Chen J. G, Fang D. Q, Ma Y. G, Cai X. Z, Guo W, Tian W. D, Wang H. W, Zhou P, 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

International Journal of Modern Physics E-Nuclear Physics19 ( 8-9 ) 1823 - 1828 2010

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DOI： 10.1142/S0218301310016259

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Low-lying states in Mg-32 studied by proton inelastic scattering Peer-reviewed

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 C79 ( 5 ) 054319 5 2009

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Language：English Publishing type：Research paper (scientific journal) Publisher：AMER PHYSICAL SOC

Proton inelastic scattering on the neutron-rich nucleus Mg-32 has been studied at 46.5 MeV/nucleon in inverse kinematics. Populated states were identified by measuring de-excitation gamma rays, in which five new states were found by gamma-gamma 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 4(1)(+). The ratio between the energies of the 2(1)(+) and 4(1)(+) states indicates that Mg-32 is a transitional nucleus rather than an axially deformed rigid rotor. The collectivities in the nucleus Mg-32 with N=20 are discussed based on the results obtained in the present experiment.

DOI： 10.1103/PhysRevC.79.054319

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Development of Large Deformation in Cr-62 Peer-reviewed

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 2009

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Language：English Publishing type：Research paper (scientific journal) Publisher：AMER PHYSICAL SOC

The structure of neutron-rich isotopes Cr-60 and Cr-62 was studied via proton inelastic scattering in inverse kinematics. The deformation lengths (delta) for Cr-60 and Cr-62 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 Cr-62 was identified for the first time. We adopted 4(+) as its spin and parity, leading to the rapid increase of the E-x(4(+))/E-x(2(+)) ratio, which indicates the development of large deformation in Cr-62 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.

DOI： 10.1103/PhysRevLett.102.012502

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Large proton contribution to the 2(+) excitation in Mg-20 studied by intermediate energy inelastic scattering Peer-reviewed

N. Iwasa, T. Motobayashi, S. Bishop, Z. Elekes, J. Gibelin, M. Hosoi, K. Ieki, K. Ishikawa, H. Iwasaki, S. Kawai, S. Kubono, K. Kurita, M. Kurokawa, N. Matsui, T. Minemura, H. Morikawa, T. Nakamura, M. Niikura, M. Notani, S. Ota, A. Saito, H. Sakurai, S. Shimoura, K. Sugawara, T. Sugimoto, H. Suzuki, T. Suzuki, I. Tanihata, E. Takeshita, T. Teranishi, Y. Togano, K. Yamada, K. Yamaguchi, Y. Yanagisawa

PHYSICAL REVIEW C78 ( 2 ) 8 2008

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Language：English Publishing type：Research paper (scientific journal) Publisher：AMER PHYSICAL SOC

Coulomb excitation of the proton-rich nucleus Mg-20 was studied using a radioactive Mg-20 beam at 58A MeV impinging on a lead target. The reduced transition probability B(E2; 0(g.s.)(+) -> 2(1)(+)) was extracted to be 177(32) e(2) fm(4), which agrees with the theoretical predictions by a cluster model assuming O-16 + 2p + 2p structure, a mean-field approach based on the angular momentum projected generator coordinate method, and the USD shell model. The ratio of the neutron-to-proton multipole matrix elements M-n/M-P in the mirror nucleus O-20 was deduced to be 2.51(25) with the M-n value evaluated from the measured B(E2) value for Mg-20 with the help of isospin symmetry. The results confirm the large M-n/M-p value previously reported in O-20, leading to the dominant role of the four valence nucleons in the 2(1)(+) excitation and persistence of the O-16 core in O-20 and Mg-20.

DOI： 10.1103/PhysRevC.78.024306

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Identification of new isotopes Pd-125 and Pd-126 produced by in-flight fission of 345MeV/nucleon U-238: First results from the RIKEN RI beam factory Peer-reviewed

Tetsuya Ohnishi, Toshiyuki Kubo, Kensuke Kusaka, Atsushi Yoshida, Koichi Yoshida, Naoki Fukuda, Masao Ohtake, Yoshiyuki Yanagisawa, Hiroyuki Takeda, Daisuke Kameda, Yoshitaka Yamaguchi, Nori Aoi, Ken-ichiro Yoneda, Hideaki Otsu, Satoshi Takeuchi, Takashi Sugimoto, Yosuke Kondo, Heiko Scheit, Yasuyuki Gono, Hiroyoshi Sakurai, Tohru Motobayasi, Hiroshi Suzuki, Taro Nakao, Hitomi Kimura, Yutaka Mizo, Masafumi Matsushita, Kazuo Ieki, Takamasa Kuboki, Takayuki Yamaguchi, Takeshi Suzuki, Akira Ozawa, Tetsuaki Moriguchi, Yusuke Yasuda, Takashi Nakamura, Takashi Nannichi, Tomoyuki Shimamura, Yoshiaki Nakayama, Hans Geissel, Helmut Weick, Jerry A. Nolen, Oleg B. Tarasov, Anthony S. Nettleton, Daniel P. Bazin, Bradley M. Sherrill, David J. Morrissey, Wolfgang Mittig

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN77 ( 8 ) 83201 8 2008

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Language：English Publishing type：Research paper (scientific journal) Publisher：PHYSICAL SOC JAPAN

A search for new isotopes using in-flight fission of a 345 MeV/nucleon U-238 beam has been carried Out in the commissioning experiment of the next-generation in-flight radioactive isotope beam separator BigRIPS at the RI Beam Factory at the RIKEN Nishina Center. Two neutron-rich palladium isotopes Pd-125 and Pd-126 were observed for the first time, which demonstrates the great potential of the RIKEN RI beam Factory.

DOI： 10.1143/JPSJ.77.083201

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Large proton contribution to the 2(+) excitation in (20)Mg studied by intermediate energy inelastic scattering (vol 78, art no 024306, 2008) Peer-reviewed

N. Iwasa, T. Motobayashi, S. Bishop, Z. Elekes, J. Gibelin, M. Hosoi, K. Ieki, K. Ishikawa, H. Iwasaki, S. Kawai, S. Kubono, K. Kurita, M. Kurokawa, N. Matsui, T. Minemura, H. Morikawa, T. Nakamura, M. Niikura, M. Notani, S. Ota, A. Saito, H. Sakurai, S. Shimoura, K. Sugawara, T. Sugimoto, H. Suzuki, T. Suzuki, I. Tanihata, E. Takeshita, T. Teranishi, Y. Togano, K. Yamada, K. Yamaguchi, Y. Yanagisawa

PHYSICAL REVIEW C78 ( 2 ) 024306 8 2008

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Language：English Publishing type：Research paper (scientific journal) Publisher：AMER PHYSICAL SOC

DOI： 10.1103/PhysRevC.78.029902

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23aZH-2 Performance of superconducting RI beam separator BigRIPS at RIKEN RIBF : Beam Optics

Matsushita M., Ieki K., Kubo T., Kusaka K., Yoshida K., Yoshida A., Ohnishi T., Ohtake M., Yanagisawa Y., Fukuda N., Haseyama T., Takeda H., Yamaguchi Y., Aoi N., Yoneda K., Ohtsu H., Takeuchi S., Kameda D., Sugimoto T., Kondo Y., Schcit Hciko, Gono Y., Sakurai H., Motobayashi T., Yano Y., Mizoi Y., Suzuki H., Nakao T., Kimura H., Kuboki T., Yamaguchi T., Suzuki K., Ozawa A., Moriguchi T., Yasuda Y., Nakamura T., Nannichi T., Shimamura T., Nakayama Y., Geissel H., Weick H., Nolen J., Tarasov O., Nettleton T., Bazin D., Sherrill B., Morrissey D., Mittig W.

Meeting Abstracts of the Physical Society of Japan63.1.1 68 2008

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Language：Japanese Publisher：The Physical Society of Japan

DOI： 10.11316/jpsgaiyo.63.1.1.0_68_1

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Investigation of stellar Si-26(p,gamma)P-27 reaction via Coulomb dissociation Peer-reviewed

Togano Y, Gomi T, Motobayashi T, Ando Y, Aoi N, Baba H, Demichi K, Elekes Z, Fukuda N, Fulop Z, 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 Y, 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 and Evolution of Galaxies1016 193 - + 2008

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Shape transition observed in neutron-rich pf-shell isotopes studied via proton inelastic scattering Peer-reviewed

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

Nuclear Physics A805 ( 1-4 ) 400 - 407 2008

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DOI： 10.1016/j.nuclphysa.2008.02.280

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Other Link： http://orcid.org/0000-0002-7291-7809
Isoscalar compressional strengths in O-14 Peer-reviewed

H. Baba, S. Shimoura, T. Minemura, Y. U. Matsuyama, A. Saito, H. Ryuto, N. Aoi, T. Gomi, Y. Higurashi, K. Ieki, N. Imai, N. Iwasa, H. Iwasaki, S. Kanno, S. Kubono, M. Kunibu, S. Michimasa, T. Motobayashi, T. Nakamura, H. Sakurai, M. Serata, E. Takeshita, S. Takeuchi, T. Teranishi, K. Ue, K. Yamada, Y. Yanagisawa

NUCLEAR PHYSICS A788 188C - 193C 5 2007

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Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

Isoscalar monopole and dipole responses in unstable nucleus O-14 have been studied for a wide excitation energy range by inelastic a scattering at 60 A MeV in inverse kinematics. In order to deduce isoscalar compressional strengths, the multipole decomposition analysis was carried out and the DWBA calculation for isoscalar excitation was studied. Result from the multipole decomposition analysis, isoscalar monopole and dipole strengths were identified corresponding to 63 +/- 12% and 109 +/- 15% of energy-weighted sum rule in E = 4.6-25.0 MeV, respectively, for the measured decay channels of O-14* -> N-13 + p, C-12 + p + p, C-12(1)* + p + p, C-10 + alpha, and C-10(1)* + alpha.

DOI： 10.1016/j.nuclphysa.2007.01.081

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Exotic cluster states in Be-12 via alpha-inelastic scattering Peer-reviewed

Saito A, Shimoura S, Minemura T, Matsuyama Y, U, Baba H, Aoi N, Gomi T, Higurashi H, Ieki K, Imai N, Iwasa N, Iwasaki H, Kanno S, Kubono S, Kunibu M, Michimasa S, Motobayashi T, Nakamura T, Ryuto H, Sakurai H, Serata M, Takeshita E, Takeuchi S, Teranishi T, Ue K, Yamada K, Yanagisawa Y

Tours Symposium on Nuclear Physics Vi891 205 - + 2007

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DOI： 10.1063/1.2713519

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Secondary neutron-production cross sections from heavy-ion interactions between 230 and 600 MeV/nucleon Peer-reviewed

L. Heilbronn, C. J. Zeitlin, Y. Iwata, T. Murakami, H. Iwase, T. Nakamura, T. Nunomiya, H. Sato, H. Yashima, R. M. Ronningen, K. Ieki

Nuclear Science and Engineering157 ( 2 ) 142 - 158 2007

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Nuclear Society

Secondary neutron-production cross sections have been measured from interactions of 230 MeV/nucleon He, 400 MeV/nucleon N, 400 MeV/nucleon Kr, 400 MeV/nucleon Xe, 500 MeV/nucleon Fe, and 600 MeV/nucleon Ne interacting in a variety of elemental and composite targets. We report the double-differential production cross sections, angular distributions, energy spectra, and total cross sections from all systems. Neutron energies were measured using the time-of-flight technique and were measured at laboratory angles between 5 and 80 deg. The spectra exhibit behavior previously reported in other heavy-ion-induced neutron-production experiments, namely, a peak at forward angles near the energy corresponding to the beam velocity, with the remaining spectra generated by preequilibrium and equilibrium processes. The double-differential spectra are fitted with a moving-source parameterization. Observations on the dependence of the total cross sections on target and projectile mass are discussed.

DOI： 10.13182/NSE07-A2719

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Target screening effect on the pre-emission of neutrons from Li-11 halo nuclei Peer-reviewed

M. Petrascu, A. Constantinescu, I. Cruceru, M. Giurgiu, A. Isbasescu, H. Petrascu, C. Bordeanu, S. Serban, V. Stoica, I. Tanihata, W. G. Lynch, M. A. Famiano, V. L. Lyuboshits, V. V. Lyuboshits, K. Ieki

PHYSICAL REVIEW C73 ( 5 ) 057601 5 2006

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Language：English Publishing type：Research paper (scientific journal) Publisher：AMER PHYSICAL SOC

For the first time to our knowledge the target screening effect on the pre-emission of halo neutrons from Li-11 has been quantitatively analyzed. Our work has been performed in the 7.5-15 MeV neutron energy range. In this range the target nuclei are likely to behave as opaque, and therefore the sharp-cutoff calculations are most appropriate for the target screening determination. It has been observed that the zeta probability used in the sharp-cutoff calculations is an observable of the experiment, because it can be directly obtained from measured quantities, which are the number of single detected neutrons and the number of detected neutron pairs. The value of zeta(exp) obtained this way in the case of a Si target appears to be close to the zeta value calculated for the Li-11 halo radius R-H=4.8 fm, independently determined in another experiment [Phys. Lett. B287, 307 (1992)]. This property also allows investigation of Borromean halo nuclei such as He-6, Be-14, and B-17, for which R-H was not yet measured. The calculated value within the present approach of the two-neutron pre-emission yield appears to be 3.5 times larger in the case of C-12 than in the case of a Si target.

DOI： 10.1103/PhysRevC.73.057601

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Study of the (26)Si(p,gamma)(27)P reaction through Coulomb dissociation of (27)P Peer-reviewed

Y. Togano, T. Gomi, T. Motobayashi, Y. Ando, N. Aoi, H. Baba, K. Demichi, Z. Elekes, N. Fukuda, Zs. Fueloep, U. Futakami, H. Hasegawa, Y. Higurashi, K. Iekil, 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 233 - 236 3 2006

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Language：English Publishing type：Research paper (scientific journal) Publisher：SPRINGER

The Coulomb dissociation of (27)P was studied experimentally using (27)P beams at 57 MeV/nucleon with a lead target. The E2 gamma decay width of the first excited state in (27)P was determined to be (2.8 +/- 0.5) x 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 (26)Si(p, gamma)(27)P 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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Can the neutron-capture cross sections be measured with Coulomb dissociation? Peer-reviewed

A. Horvath, K. Ieki, A. Kiss, A. Galonsky, M. Thoennessen, T. Baumann, D. Bazin, C. A. Bertulani, C. Bordeanu, N. Carlin, M. Csanad, F. Deak, P. DeYoung, N. Frank, T. Fukuchi, Zs. Fueloep, A. Gade, D. Galaviz, C. Hoffman, R. Izsak, W. A. Peters, H. Schelin, A. Schiller, R. Sugo, Z. Seres, G. I. Veres

EUROPEAN PHYSICAL JOURNAL A27 ( Supplement 1 ) 217 - 220 3 2006

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Language：English Publishing type：Research paper (scientific journal) Publisher：SPRINGER

In this paper we present first results from a (8)Li electromagnetic neutron-breakup experiment. Specific reactions studied were Pb((8)Li,(7)Li+n)Pb and C((8)Li,(7)Li+n)C at 41 MeV/nucleon beam energy. This is an effort to compare the results of a Coulomb dissociation experiment with the well determined (n, gamma) reaction cross sections at astrophysical energies. The angular dependence of the cross section above 7 degree, which is the grazing angle of (8)Li-Pb system, is similar in shape for lead and carbon and approximately proportional to A(2/3) in magnitude indicating that the nuclear dissociation is the main component in this region. At very forward angles the angular distributions differ significantly and the electromagnetic dissociation dominates for the lead, although the nuclear contribution is not negligible.

DOI： 10.1140/epja/i2006-08-033-6

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Secondary neutron-production cross sections from heavy-ion interactions in composite targets Peer-reviewed

L Heilbronn, Y Iwata, H Iwase, T Murakami, H Sato, T Nakamura, RM Ronningen, K Ieki, Gudowska, I, N Sobolevsky

PHYSICAL REVIEW C73 ( 2 ) 024603 2 2006

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Language：English Publishing type：Research paper (scientific journal) Publisher：AMER PHYSICAL SOC

Secondary neutron-production cross sections have been measured from interactions of 290 MeV/nucleon C and 600 MeV/nucleon Ne in a target composed of simulated Martian regolith and polyethylene, and from 400 MeV/nucleon Ne interactions in wall material from the International Space Station. The data were measured between 5 degrees and 80 degrees in the laboratory. We report the double-differential cross sections, angular distributions, and total neutron-production cross sections from all three systems. The spectra from all three systems exhibit behavior previously reported in other heavy-ion neutron-production experiments, namely, a peak at forward angles near the energy corresponding to the beam velocity, with the remaining spectra generated by pre-equilibrium and equilibrium processes. The double-differential cross sections are fitted with a moving-source parametrization. Also reported are the data without corrections for neutron flux attenuation in the target and other intervening materials and for neutron production in nontarget materials near the target position. These uncorrected spectra are compared with SHIELD-HIT and PHITS transport model calculations. The transport model calculations reproduce the spectral shapes well but, on average, underestimate the magnitudes of the cross sections.

DOI： 10.1103/PhysRevC.73.024603

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Proton inelastic scattering on 32Mg Peer-reviewed

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

Journal of Physics: Conference Series49 ( 1 ) 153 - 154 2006

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DOI： 10.1088/1742-6596/49/1/033

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Other Link： http://orcid.org/0000-0001-8864-369X
Coulomb dissociation of 27P for study of Si-26(p,gamma)P-27 reaction Peer-reviewed

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 Y. U, Michimasa S, Minemura T, Miura A, Murakami H, Nakamura T, Notani M, Ota S, Saito A, Serata A, Shimoura S, Sugimoto T, Takeshita E, Takeuchi S, Ue K, Yamada K, Yanagisawa Y, Yoneda K, Yoshida A

ORIGIN OF MATTER AND EVOLUTION OF GALAXIES847 281 - + 2006

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Coulomb excitation of 20Mg Peer-reviewed

N. Iwasa, S. Bishop, Z. Elekes, J. Gibelin, M. Hosoi, K. Ieki, K. Ishikawa, H. Iwasaki, S. Kawai, S. Kubono, K. Kurita, M. Kurokawa, N. Matsui, T. Minemura, H. Morikawa, T. Nakamura, M. Niikura, M. Notani, S. Ota, A. Saito, H. Sakurai, S. Shimoura, K. Sugawara, T. Sugimoto, H. Suzuki, T. Suzuki, I. Tanihata, E. Takeshita, S. Takeuchi, T. Teranishi, Y. Togano, Y. Yanagisawa, K. Yamada, K. Yamaguchi, T. Motobayashi

RIKEN Accelerator Progress Report 200438 58 - 58 31 5 2005

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Language：English Publishing type：Research paper (bulletin of university, research institution)

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Study of the Si-26(p,gamma)P-27 reaction by the Coulomb dissociation method Peer-reviewed

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

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DOI： 10.1142/9789812702739_0066

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Coulomb dissociation of Al-23 - Study of the Mg-22(p,gamma)Al-23 reaction Peer-reviewed

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, Togano Y, Ue K, Yamada K, Yanagisawa Y, Yoneda K, Yoshida A

Origin of Matter & Evolution of Galaxies 2003 477 - 480 2005

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DOI： 10.1142/9789812702739_0048

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Study of Si-26(p,gamma)P-27 reaction using Coulomb dissociation method Peer-reviewed

Togano Y, Gomi T, Motobayashi T, Ando Y, Aoi N, Baba H, Demichi K, Elekes Z, Fukuda N, Fulop Z, 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, Yoshidab A

Nuclear Physics a758 182C - 185C 2005

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DOI： 10.1016/j.nuclphysa.2005.05.035

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Coulomb dissociation of Al-23 for the stellar Mg-22(p,gamma)Al-23 reaction Peer-reviewed

Gomi T, Motobayashi T, Ando Y, Aoi N, Baba H, Demichi K, Elekes Z, Fukuda N, Fulop Z, 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, Togano Y, Ue K, Yamada K, Yanagisawa Y, Yoneda K, Yoshida A

Nuclear Physics a758 761C - 764C 2005

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DOI： 10.1016/j.nuclphysa.2005.05.137

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Coulomb dissociation experiment for explosive hydrogen burning: study of the Mg-22(p, gamma)Al-23 reaction Peer-reviewed

Gomi T, Motobayashi T, Ando Y, Aoi N, Baba H, Demichi K, Elekes Z, Fukuda N, Fulop Z, 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, Togano Y, Ue K, Yamada K, Yanagisawa Y, Yoneda K, Yoshida A

Journal of Physics G-Nuclear and Particle Physics31 ( 10 ) S1517 - S1521 2005

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DOI： 10.1088/0954-3899/31/10/023

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Molecular states in neutron-rich beryllium isotopes Peer-reviewed

A Saito, S Shimoura, S Takeuchi, T Motobayashi, T Minemura, YU Matsuyama, H Baba, H Akiyoshi, Y Ando, N Aoi, Z Fulop, T Gomi, Y Higurashi, M Hirai, K Ieki, N Imai, N Iwasa, H Iwasaki, Y Iwata, S Kanno, H Kobayashi, S Kubono, M Kunibu, M Kurokawa, Z Liu, S Michimasa, T Nakamura, S Ozawa, H Sakurai, M Serata, E Takeshita, T Teranishi, K Ue, K Yamada, Y Yanagisawa, M Ishihara

NUCLEAR PHYSICS A738 337 - 341 6 2004

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Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

Excited states in 12 Be were investigated by measuring alpha-inelastic scattering of 12 Be. New excited states in Be-12 were observed at 10.9 MeV and 11.3 MeV in a decay-energy spectrum of the He-6+He-6 final channel. Spins for these levels were determined to be 0 and 2, respectively, from the angular distributions of the inelastic scattering to these excited states. The observed states may be members of the rotational band with a He-6-He-6 cluster structure.

DOI： 10.1016/j.nuclphysa.2004.04.057

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Study of the Stellar 22Mg(p,γ)23Al reaction using the coulomb-dissociation method Peer-reviewed

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, Y. Togano, K. Ue, K. Yamada, Y. Yanagisawa, K. Yoneda, A. Yoshida

Nuclear Physics A734 ( 1-4 ) E77 - E79 5 4 2004

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1016/j.nuclphysa.2004.03.024

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Study of the Stellar 22Mg(p,γ)23Al reaction using the coulomb-dissociation method

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, Y. Togano, K. Ue, K. Yamada, Y. Yanagisawa, K. Yoneda, A. Yoshida

Nuclear Physics A734 ( 1-4 ) E77 - E79 5 4 2004

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1016/j.nuclphysa.2004.03.024

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In-beam gamma spectroscopy of Si-34 with deuteron inelastic scattering using reverse kinematics Peer-reviewed

N Iwasa, T Motobayashi, H Sakurai, H Akiyoshi, Y Ando, N Aoi, H Baba, N Fukuda, Z Fulop, U Futakami, T Gomi, Y Higurashi, K Ieki, H Iwasaki, T Kubo, S Kubono, H Kinugawa, H Kumagai, M Kunibu, S Michimasa, T Minemura, H Murakami, K Sagara, A Saito, S Shimoura, S Takeuchi, Y Yanagisawa, K Yoneda, M Ishihara

PHYSICAL REVIEW C67 ( 6 ) 064315 6 2003

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Language：English Publishing type：Research paper (scientific journal) Publisher：AMERICAN PHYSICAL SOC

Excited states of Si-34 were studied in the H-2(Si-34, Si-34 gamma) reaction using a radioactive Si-34 beam at 38.4A MeV and a liquid deuterium target. Deexcitation gamma rays were measured using a NaI(Tl)-scintillator array in coincidence with scattered Si-34 particles. From gamma-gamma coincidence analyses, the gamma lines at 1.193, 1.715, and 2.696 MeV, which were reported previously but unplaced in the level diagram, were found to be associated with the 3.326-MeV gamma line corresponding to the transition from the first 2(+) state to the ground state. This excludes the 1.193-MeV line as a candidate for the transition from the 2(+) state to the second 0(+) state, as suggested by Nummela et al. [Phys. Rev. C 63, 044316-2001)].

DOI： 10.1103/PhysRevC.67.064315

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Isomeric 0(+) state in Be-12 Peer-reviewed

S Shimoura, A Saito, T Minemura, YU Matsuyama, H Baba, H Akiyoshi, N Aoi, T Gomi, Y Higurashi, K Ieki, N Imai, N Iwasa, H Iwasaki, S Kanno, S Kubono, M Kunibu, S Michimasa, T Motobayashi, T Nakamura, H Sakurai, M Serata, E Takeshita, S Takeuchi, T Teranishi, K Ue, K Yamada, Y Yanagisawa, M Ishihara, N Itagaki

PHYSICS LETTERS B560 ( 1-2 ) 31 - 36 5 2003

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Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

An isomeric 0(+) state in Be-12 was found at E-x = 2.24 MeV The isomer was identified by measuring coincident two gamma-rays from in-flight Be-12 nuclei, Be-12m --> Be-12* (2(1)(+)) Be-12(g.s)., produced by the projectile fragmentation of O-18 at 100 A MeV on a beryllium target. Its spin was determined to be 0(+) by the angular correlation of the two gamma-rays. The low excitation energy of the 0(+) state is a strong evidence of the break of the N = 8 shell closure in the Be-12 nucleus. (C) 2003 Published by Elsevier Science B.V.

DOI： 10.1016/S0370-2693(03)00341-1

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Measurements of astrophysical neutron capture cross sections via the inverse reaction Peer-reviewed

A Horvath, A Galonsky, N Carlin, F Deak, T Gomi, Guimaraes, V, Y Higurashi, K Hiroshi, K Ieki, Y Iwata, A Kiss, J Kolata, T Rauscher, H Schelin, J von Schwarzenberg, Z Seres, S Takeuchi, S Typel, R Warner, J Weiner

NUCLEAR PHYSICS A719 9C - 12C 5 2003

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Neutron capture of short-lived isotopes can be important within several astrophysical environments. The laboratory investigation of these reactions can be difficult since these isotopes cannot form a target. We used radioactive beams and measured the inverse reaction instead. Particularly we used (15)C and (9)Li beams to measure the (14)C(n,gamma)(15)C, and (8)Li(n, gamma)(9)Li reactions. We determined the reaction rates within the astrophysically interesting temperature range. Our data for the (14)C capture rises quickly up to 8mub and then it decreases by a factor of two at 1 MeV. We investigated neutron capture by 8 Li which is one possible leak of the bridging reaction (8)Li(alpha, n)(11)B of the A=8 gap. We found that this leak is lower than the theoretical expectations.

DOI： 10.1016/S0375-9474(03)00951-5

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Study of the Mg-22(p,gamma)Al-23 reaction with the Coulomb-dissociation method Peer-reviewed

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

Nuclear Physics a718 508C - 509C 2003

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DOI： 10.1016/S0375-9474(03)00826-1

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Astrophysical reaction rate for the Li-8(n,gamma)Li-9 reaction Peer-reviewed

H Kobayashi, K Ieki, A Horvath, A Galonsky, N Carlin, F Deak, T Gomi, Guimaraes, V, Y Higurashi, Y Iwata, A Kiss, JJ Kolata, T Rauscher, H Schelin, Z Seres, R Warner

PHYSICAL REVIEW C67 ( 1 ) 15806 1 2003

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Language：English Publishing type：Research paper (scientific journal) Publisher：AMER PHYSICAL SOC

An attempt was made to measure the excitation function of the cross section for the Li-8(n,gamma)Li-9 reaction by performing the inverse reaction Li-9(gamma,n)Li-8, with the equivalent photons in the electric field of nuclei in a Pb target providing the gamma rays for the reaction. The energy spectrum of lithium nuclei in coincidence with neutrons had no discernible peak where any beam-velocity Li-8's would be located. Statistically, a Gaussian-shaped Li-8 peak could have been present with 30+/-29 counts, which we interpreted as consistent with zero, with a two-standard-deviation upper limit of 87 counts. Using the fact that neutron capture on Li-8 must be dominantly s-wave capture, and applying detailed balance, we obtained, with E in eV, sigma(n,gamma)<930E(-1/2) mu b. The corresponding limit on the astrophysical reaction rate is <790 cm(3) mol(-1) s(-1). Theoretical predictions of the reaction rate have exceeded our upper limit by factors of 3-50.

DOI： 10.1103/PhysRevC.67.015806

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Dissociation of 6He J.Wang, A.Galonsky, J.J.Kruse, E.Tryggestad, R.H.Stevens, P.D.Zecher, Y.Iwata, K.Ieki, A.Horvath, F.Deak, A.Kiss, Z.Seres, J.J.Kolata, J.von Schwarzenberg, R.E.Warner, and H.Schelin

Phys.Rev.C65, 034306 4 2002

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Fragment Detection System for Studies of Exotic Neutron-Rich Nuclei J.J.Kruse, A.Galonsky, C.Snow, E.Tryggestad, J.Wang, K.Ieki, Y.Iwata, P.D.Zecher

Nucl.Instrum. and Methods in Physics ResearchA480, 598-609 4 2002

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Cross section for the Astrophysical 14C(n, γ)15C Reaction via the Inverse Reaction A.Horvath, J.Weiner, A.Galonsky, F.Deak, Y.Higurashi, K.Ieki, Y.Iwata, A.Kiss, J.J.Kolata, Z.Seres, J.von Schwarzenberg, H.Shelin, S.Takeuchi, S.Typ

Astrophysical Journal570, 926-933 4 2002

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Inelastic scattering of 12Be with 4He

Yuuichi U. Matsuyama, Tohru Motobayashi, Susumu Shimoura, Toshiyuki Minemura, Akito Saito, Hidetada Baba, Hiromichi Akiyoshi, Nori Aoi, Yoshiaki Ando, Tomoko Gomi, Yoshihide Higurashi, Kazuo Ieki, Nobuaki Imai, Naohito Iwasa, Hironori Iwasaki, Shouko Kanno, Shigeru Kubono, Makoto Kunibu, Shin'ichiro Michimasa, Hiroyuki Murakami, Takashi Nakamura, Hiroyoshi Sakurai, Masaki Serata, Eri Takeshita, Satoshi Takeuchi, Takashi Teranishi, Koji Ue, Kazunari Yamada, Yoshiyuki Yanagisawa

Progress of Theoretical Physics ( 146 SUPPL. ) 593 - 594 2002

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Publishing type：Research paper (international conference proceedings)

Inelastic scattering of the neutron-rich nucleus 12Be on a liquid-He target has been studied by measuring de-excitation γ rays in coincidence with scattered 12Be. In the angular distribution, a difference between the 21+ and the 1- state in 12Be was cleary seen.

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Inelastic scattering of Be-12 with He-4 Peer-reviewed

Matsuyama YU, Motobayashi T, Shimoura S, Minemura T, Saito A, Baba H, Akiyoshi H, Aoi N, Ando Y, Gomi T, Higurashi Y, Ieki K, Imai N, Iwasa N, Iwasaki H, Kanno S, Kubono S, Kunibu M, Michimasa S, Murakami H, Nakamura T, Sakurai H, Serata M, Takeshita E, Takeuchi S, Teranishi T, Ue K, Yamada K, Yanagisawa Y

PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT ( 146 ) 593 - 594 2002

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Coulomb excitation of Si-24 Peer-reviewed

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

Progress of Theoretical Physics Supplement ( 146 ) 575 - 576 2002

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Coulomb dissociation of Al-23 Peer-reviewed

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

Progress of Theoretical Physics Supplement ( 146 ) 557 - 558 2002

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Cross section for the Astrophysical 14C(n,γ)15C Reaction via the Inverse Reaction

家城和夫

Astrophys. J. 1 1 2002

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Dissociation of 6He

家城和夫

Phys. Rev. ( C65 ) 34306 1 1 2002

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Double-differential cross sections for the neutron production from heavy-ion reactions at energies E/A= 290-600 MeV

Y. Iwata, T. Murakami, H. Sato, H. Iwase, T. Nakamura, T. Kurosawa, L. Heilbronn, R. M. Ronningen, K. Ieki, Y. Tozawa, K. Niita

Physical Review C - Nuclear Physics64 ( 5 ) 546091 - 5460910 2001

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Physical Society

We have measured the double-differential cross sections for neutron production from C, Ne, and Ar projectiles at E/A = 290-600 MeV on C, Cu, and Pb targets. Neutron energies were measured at laboratory angles between 5° and 80°. The measured neutron spectra have three components. At forward angles, a prominent peak originating from the projectile-fragmentation process was observed. The velocity of neutrons corresponding to the peak was about the same as that of the projectile. In addition to the peak, two components of Maxwellian-shape distributions corresponding to the preequilibrium and equilibrium processes were observed. By fitting with a moving-source model having three components, the neutron spectra were fairly well described. The parameters obtained for each component are consistent with a picture of the projectile fragmentation, preequilibrium, and equilibrium processes. By integrating the fitted functions with respect to the neutron energies and solid angles, the angular distributions and total cross sections for the neutron production were determined. The neutron spectra, angular distributions, and total cross sections were compared with those calculated by the quantum molecular dynamics and heavy-ion codes. We found that neither of the codes could reproduce the measured cross sections for all combinations of the projectiles and targets.

DOI： 10.1103/PhysRevC.64.054609

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Coulomb breakup of 7Li for nuclear astrophysics

Y. Tokimoto, H. Utsunomiya, T. Yamagata, M. Ohta, Y. W. Lui, R. P. Schmitt, S. Typel, Y. Aoki, K. Ieki, K. Katori

Physical Review C - Nuclear Physics63 ( 3 ) 358011 - 3580120 2001

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Physical Society

A new Coulomb breakup experiment was performed for 7Li with an improved experimental technique and theoretical treatment. Energy spectra of α particles and tritons were examined to find the signature of post-Coulomb acceleration in the breakup of 7Li at Eαt=0. The data revealed the delayed nature of nonresonant breakup of astrophysical relevance that stems from quantum tunneling. Semiclassical discussions are presented of the lifetime of continuum states in 7Li and distortion of relative kinetic energies between α and t by post-Coulomb acceleration. Dynamical calculations of Coulomb breakup were performed by solving a time-dependent Schrödinger equation. A simple potential model of 7Li was employed. The dynamical calculations reasonably reproduced experimental cross sections for both resonant and nonresonant breakup with two key ingredients: higher order effects and mixture of E1 and E2 multipoles. Considering the dominant role of the first-order E1 nature in adiabatic Coulomb breakup, cross sections in the vα≥vt branch at 7 °-15 ° for 64Zn and 90Zr were used to deduce astrophysical S factors S(E) for t(α, γ)7Li. They exhibit a moderate energy dependence at small energies. The strongly energy-dependent S(E) resulted from the previous Coulomb breakup experiment based on cross sections with vα≤vt
they are most likely Coulomb distorted and are revised in the present work.

DOI： 10.1103/PhysRevC.63.035801

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Double-differential cross sections for the neutron production from heavy-ion reactions at energies E/A= 290-600 MeV

Y. Iwata, T. Murakami, H. Sato, H. Iwase, T. Nakamura, T. Kurosawa, L. Heilbronn, R. M. Ronningen, K. Ieki, Y. Tozawa, K. Niita

Physical Review C - Nuclear Physics64 ( 5 ) 546091 - 5460910 2001

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Physical Society

We have measured the double-differential cross sections for neutron production from C, Ne, and Ar projectiles at E/A = 290-600 MeV on C, Cu, and Pb targets. Neutron energies were measured at laboratory angles between 5° and 80°. The measured neutron spectra have three components. At forward angles, a prominent peak originating from the projectile-fragmentation process was observed. The velocity of neutrons corresponding to the peak was about the same as that of the projectile. In addition to the peak, two components of Maxwellian-shape distributions corresponding to the preequilibrium and equilibrium processes were observed. By fitting with a moving-source model having three components, the neutron spectra were fairly well described. The parameters obtained for each component are consistent with a picture of the projectile fragmentation, preequilibrium, and equilibrium processes. By integrating the fitted functions with respect to the neutron energies and solid angles, the angular distributions and total cross sections for the neutron production were determined. The neutron spectra, angular distributions, and total cross sections were compared with those calculated by the quantum molecular dynamics and heavy-ion codes. We found that neither of the codes could reproduce the measured cross sections for all combinations of the projectiles and targets.

DOI： 10.1103/PhysRevC.64.054609

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Comparison of two liquid scintillators used for neutron detection

Nuclear Instrument and Methods in Physics ResearchA440 241-244 4 2000

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Dissociation of 8He Y.Iwata, K.Ieki, A.Galonsky, J.J.Kruse, J.Wang, R.H.White-Stevens, E.Triggestad, P.D.Zecher, F.Deak, A.Horvath, A.Kiss, Z.Seres, J.J.Kolata, J.von Schwarzenberg, R.E.Warner, and H.Schelin

Phys.Rev.C62, 064311 4 2000

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Dissociation of 8He

家城和夫

Phys. Rev. ( C62 ) 64311 1 1 2000

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Exciation of Continuum States in 11Li and their Decay by quantum tunneling

Nuclear PhysicsA654 928c-931c 4 1999

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Time scales from two-neutron intensity interferometry for the reaction Ar-40+Ho-165 at E/A=25 MeV

SJ Gaff, A Galonsky, CK Gelbke, T Glasmacher, M Huang, JJ Kruse, GJ Kunde, R Lemmon, WG Lynch, MB Tsang, J Wang, PD Zecher, F Deak, A Horvath, A Kiss, Z Seres, K Ieki, Y Iwata

PHYSICAL REVIEW C58 ( 4 ) 2161 - 2166 10 1998

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Language：English Publishing type：Research paper (scientific journal) Publisher：AMER PHYSICAL SOC

As a test for the time scale of neutron emission, two-neutron intensity interferometry was applied to the reaction Ar-40+Ho-165 at E/A = 25 MeV. After appropriate corrections for neutron scattering, the correlation function showed a lifetime that was about a factor of two shorter than the lifetime predicted for the statistical decay of an equilibrated nucleus. Preequilibrium emission may explain some of this difference. [S0556-2813(98)00210-6].

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Method of Coulomb Breakup Probing Primodial 7Li Synthesis

Nuclear Instruments and Methods in Physics Research A402 417 4 1998

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A Measurement of the 8Li(n, y)9Li Cross section at Astrophysical Energies by Reverse Kinematics

Physical ReviewC57 959-966 4 1998

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A Large-Area, Position-Sensitive Neutron Detector with Neutron/γ-ray Discrimination Capabilities

家城和夫

Nuclear Instruments and Methods in Physics Research ( A401 ) 329 - 344 1 1 1998

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Strongly-suppressed post-Coulomb acceleration in non-resonant breakup of Li-7

H Utsunomiya, Y Tokimoto, H Mabuchi, K Osada, T Yamagata, M Ohta, Y Aoki, K Hirota, K Ieki, Y Iwata, K Katori, S Hamada, YW Lui, RP Schmitt

PHYSICS LETTERS B416 ( 1-2 ) 43 - 49 1 1998

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Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

Cross sections were measured at energies of astrophysical relevance for the non-resonant breakup of 42 MeV-Li-7 by 6 targets. It was found that post-acceleration of the alpha and the triton in the target Coulomb field is vanishingly small, independent of the target nucleus, compared to that for prompt breakup, The transition probabilities were evaluated for the astrophysical continua in Li-7 which decay by tunneling through the Coulomb barrier. They are consistent with the present observations. (C) 1998 Elsevier Science B.V.

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A Large-Area, Position-Sensitive Neutron Detector with Neutron/γ-ray Discremination Capabilities

Nuclear Instruments and Methods in Physics Research A401 329 4 1997

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Neutron Cross-Talk in a Multi-Detector System

家城和夫

Nuclear Instruments and Methods in Physics Research ( A397 ) 380 - 390 1 1 1997

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Decay mechanism of a highly excited nucleus produced in the reaction Kr-84+Al-27 at 10.6 MeV/nucleon

Y Futami, K YuasaNakagawa, T Nakagawa, SM Lee, K Furutaka, K Matsuda, K Yoshida, SC Jeong, H Fujiwara, T Mizota, Y Honjo, S Tomita, B Heusch, K Ieki, J Kasagi, WQ Shen, T Matsuse

NUCLEAR PHYSICS A607 ( 1 ) 85 - 104 9 1996

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Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

The cross section, energy distribution and angular distribution of complex fragments emitted in the reaction Kr-84+ Al-27 at the incident energy of 10.6 MeV/nucleon were measured to study the decay mechanism of a highly excited nucleus. Through coincidence measurements between the light charged particles and the binary decay fragments it is found that the pre-scission charge multiplicity is about 80% of the total one. The experimental distributions are well reproduced by the Extended Hauser-Feshbach Method (EHFM), introducing a cut-off energy of the excitation energy of fragments E(cut-off). The fission delay time is determined to be 2 x 10(-20) seconds. The role and the physical meaning of E(cut-off) is discussed.

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Is there a bound dineutron in 11Li?

K. Ieki, A. Galonsky, D. Sackett, J. J. Kruse, W. G. Lynch, D. J. Morrissey, N. A. Orr, B. M. Sherrill, J. A. Winger, F. Deák, Á Horváth, Á Kiss, Z. Seres, J. J. Kolata, R. E. Warner, D. L. Humphrey

Physical Review C - Nuclear Physics54 ( 4 ) 1589 - 1591 1996

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Physical Society

Photodisintegration of 11Li was accomplished by sending a beam of 11Li at 28 MeV/nucleon through the equivalent photon field of a lead target. By measuring the complete kinematics of the disintegration products, 9Li+n+n, we constructed the correlation of the angle between the two neutrons in the rest frame of the 11Li. The correlation is independent of angle. This result argues against the existence of a bound dineutron in the ground state of 11Li.

DOI： 10.1103/PhysRevC.54.1589

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10MeVの6Heの12C,natNi,197Auによる弾性散乱(共著)

51 ( 1 ) 178 4 1995

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Elastic scattering of 10 MeV 6He from 12C, natNi, and 1197Au

Physical Review51 ( 1 ) 178 4 1995

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LARGE-DEFORMATION OF THE VERY NEUTRON-RICH NUCLEUS MG-32 FROM INTERMEDIATE-ENERGY COULOMB-EXCITATION

T MOTOBAYASHI, Y IKEDA, Y ANDO, K IEKI, M INOUE, N IWASA, T KIKUCHI, M KUROKAWA, S MORIYA, S OGAWA, H MURAKAMI, S SHIMOURA, Y YANAGISAWA, T NAKAMURA, Y WATANABE, M ISHIHARA, T TERANISHI, H OKUNO, RF CASTEN

PHYSICS LETTERS B346 ( 1-2 ) 9 - 14 3 1995

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Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

The Coulomb excitation of a very neutron-rich nucleus Mg-32 to its 2(+) State was studied using an unstable nuclear beam of Mg-32 at 49.2 MeV/u with a Pb-208 target. The B(E2) value of 454 +/- 78 e(2)fm(4) was extracted by a coupled channel analysis. The value is in good agreement with recent predictions. It confirms a large deformation for Mg-32 suggested by the low excitation energy of the 2(+) state, and points to the vanishing of the N = 20 shell gap.

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RADIATION-DAMAGE FACTOR FOR ION-IMPLANTED SILICON DETECTORS IRRADIATED WITH HEAVY-IONS Peer-reviewed

Kurokawa M, Motobayashi T, Ieki K, Shimoura S, Murakami H, Ikeda Y, Moriya S, Yanagisawa Y, Nomura T

Ieee Transactions on Nuclear Science42 ( 3 ) 163 - 166 1995

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DOI： 10.1109/23.387356

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マイラーとテフロンフィルムの光学的透過度(共著)

光学技術33 ( 9 ) 3031 4 1994

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Optical transmission of Mylar and Teflon films

Optical Engineering33 ( 9 ) 3031 4 1994

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Coulomb Dissociation of 8B and the 7Be(P3γ)8B Reaction at Low Energies(共著)

Physical Review Letters73 2680 4 1994

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(α,d)反応による 26Alの6-,5-状態の励起

A563,457 4 1993

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Population of 6- and 5- States in 26Al by the (α, d) Reaction

Nuclear PhysicsA563,457 4 1993

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Electromagnetic Excitation of 11Li

家城和夫

Physical Review ( C48 ) 118 - 135 1 1 1993

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Coulomb Dissociation of 11Li

家城和夫

Physical Review Letters ( 70 ) 730 - 733 1 1 1993

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Momentum Distributions for (11Li,9Li+n+n) Breakup Reactions

家城和夫

Physical Review ( C48 ) 326 - 331 1 1 1993

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Complex Fragment Distributions in 84Kr+ 27Al at E1ab=10.6MeV/u

Physics LettersB283,185 4 1992

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有限温度における巨大双極子共鳴の奨励エネルギー・スピン依存性

A538,585C 4 1992

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E1ab=10.6Mev/uにおける 84Kr+ 27Al反応の複合核放出分布

B283,185 4 1992

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E/A=26MeVの 40Ar+Ni, 92Mo, 122Sn核融合反応での中性子放出

C46,961 4 1992

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Neutron Emission for the Fusion of 40Ar+Ni, 92Mo, 122Sr Reactions at E/A=26 MeV

Physical ReviewC46,961 4 1992

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COULOMB DISSOCIATION OF O-14 - SIMULATION OF THE ASTROPHYSICAL N-13(P,GAMMA)O-14 PROCESS Peer-reviewed

T MOTOBAYASHI, T TAKEI, S KOX, C PERRIN, F MERCHEZ, D REBREYEND, K IEKI, H MURAKAMI, Y ANDO, N IWASA, M KUROKAWA, S SHIRATO, J RUAN, T ICHIHARA, T KUBO, N INABE, A GOTO, S KUBONO, S SHIMOURA, M ISHIHARA

RADIOACTIVE NUCLEAR BEAMS 1991 335 - 340 1992

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：ADAM HILGER LTD

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EXPERIMENTAL-STUDY ON THE COULOMB BREAKUP OF O-14 Peer-reviewed

T MOTOBAYASHI, T TAKEI, S KOX, C PERRIN, F MERCHEZ, D REBREYEND, K IEKI, H MURAKAMI, Y ANDO, N IWASA, M KUROKAWA, S SHIRATO, J RUAN, T ICHIHARA, T KUBO, N INABE, A GOTO, S KUBONO, S SHIMOURA, M ISHIHARA

UNSTABLE NUCLEI IN ASTROPHYSICS 211 - 221 1992

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：WORLD SCIENTIFIC PUBL CO PTE LTD

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Dynamics of the projectile-like fragment emission in the 40Ar+209Bi reaction at 26 MeV u-1

K. Ieki, N. Iwasa, Y. Ando, K. Hata, T. Motobayashi, H. Murakami, M. Ogiwara, Jian-Zhi Ruan, S. Shibuya, S. Shirato, H. Fujiwara, S. C. Jeong, S. M. Lee, T. Mizota, Y. Nagashima, M. Ogihara, S. Okumura, Y. H. Pu, M. Ishihara

Journal of Physics G: Nuclear and Particle Physics18 ( 2 ) 401 - 411 1992

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Angular distributions of fission fragments emitted in the 40Ar+209Bi reaction at 26 MeV u-1 were measured in coincidence with projectile-like fragments (PLF). Linear momentum transfer, angular momentum transfer ltr and spin alignment PZZ of the fissile nucleus were deduced as functions of the atomic number Z of PLF. Observed trend of ltr and PZZ suggests that a significant part of the PLF is emitted in dissipative process. Large missing momenta were observed. They are attributed to pre-equilibrium light-particle emission from the fissile nucleus.

DOI： 10.1088/0954-3899/18/2/020

Scopus

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Excitation energy and spin dependence of the giant dipole resonance at finite temperature

J. Kasagi, K. Furutaka, T. Murakami, A. Yajima, M. Ohshima, S. Niiya, H. Tominaga, K. Yoshida, H. Hama, K. Ieki, W. Galster, K. Kubo, M. Ishihara, A. Galonsky

Nuclear Physics, Section A538 ( C ) 585 - 591 1992

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In order to investigate the evolution of the GDR from low to high excitation energies, a series of experiments, in which high energy γ-rays were measured in heavy ion fusion reactions, have been performed at JAFRI and at RIKEN. It has been confirmed that the width of the GDR increases rapidly for Ex ≥ 100 MeV and our previously introduced Γ(Ex) can explain the data well for 80 ≤ Ex ≤ 120 MeV. The limiting temperature of the nucleus for existing of the GDR has been deduced for A ∼ 70, 105 and 130. The GDR seems to disappear at the temperature of about a quarter of the resonance energy. © 1992.

DOI： 10.1016/0375-9474(92)90807-V

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COMPLEX FRAGMENT MASS DISTRIBUTIONS IN KR-84 + AL-27 AT ELAB = 10.6 MEV/U

K YUASANAKAGAWA, YH PU, SC JEONG, H FUJIWARA, T MIZOTA, SM LEE, T NAKAGAWA, B HEUSCH, K IEKI, T SUGIMITSU, T MATSUSE

TOWARDS A UNIFIED PICTURE OF NUCLEAR DYNAMICS250 100 - 111 1992

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：AIP PRESS

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Determination of the Astrophysical 13N(p,\gamma)^{14}O Cross Section through the Coulomb Dissociation Method

家城和夫

Phys. Lett. ( B264 ) 259 - 263 1 11 1990

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Language：English Publishing type：Research paper (other academic)

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Excitation Energy Dependence of the Giant Dipole Resonance in Hot Nuclei Peer-reviewed

K. Yoshida, J. Kasagi, H. Hama, M. Sakurai, M. Kodama, K. Furutaka, K. Ieki, W. Galster, T. Kubo, M. Ishihara

Phys. Lett. B245 ( 1 ) 7 - 12 2 8 1990

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1016/0370-2693(90)90155-Y

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GAMMA-RAY AND NEUTRON EMISSION FROM HOT NUCLEI Peer-reviewed

J KASAGI, K YOSHIDA, H HAMA, M SAKURAI, M KODAMA, K FURUTAKA, K IEKI, W GALSTER, T KUBO, M ISHIHARA, A GALONSKY

SECOND IN2P3-RIKEN SYMPOSIUM ON HEAVY-ION COLLISIONS 304 - 313 1990

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：WORLD SCIENTIFIC PUBL CO PTE LTD

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New Method of Position Determination for Two-Dimensional Position Sensitive Detector

家城和夫

Nuclear Instruments and Methods ( A297 ) 312 - 314 1 1 1990

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Language：English Publishing type：Research paper (other academic)

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Density dependent interaction applied to low-multipole (p,p) and (p,n) transitions in light nuclei

K. Ieki, J. Iimura, M. Iwase, H. Ohnuma, H. Shimizu, H. Toyokawa, K. Furukawa, H. Kabasawa, T. Nakagawa, T. Tohei, H. Orihara, S. I. Hayakawa, T. Hasegawa, K. Nisimura, M. Yasue, K. Miura, T. Suehiro, M. A. Franey

Physical Review C42 ( 1 ) 457 - 460 1990

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The density-dependent interaction based on the Bonn-J̈lich G-matrix NN interaction was used in a distorted-wave Born approximation analysis of (p,p) and (p,n) data for p-shell nuclei at Ep=35 MeV. Calculations with this interaction fit the data as well as the commonly used density-independent interaction M3Y and gave significant improvement for analyzing powers of unnatural-parity transitions. Most of the improvement was found to be due to the tensor part of the interaction. © 1990 The American Physical Society.

DOI： 10.1103/PhysRevC.42.457

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A Liquid-Helium Scintillator as a Fast Neutron Polarimeter

家城和夫

Nuclear Instruments and Methods ( A262 ) 323 - 328 1 1 1987

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Language：English Publishing type：Research paper (other academic)

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SPIN POLARIZATION OF RESIDUAL NUCLEI IN (N-14,ALPHA) REACTIONS AT 115 MEV

K IEKI, M ISHIHARA, T INAMURA, S KOHMOTO, H UTSUNOMIYA, K SUEKI, H KUDO

PHYSICS LETTERS B150 ( 1-3 ) 83 - 86 1985

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Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

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Misc.

23aBD-5 直接反応を用いたN=20領域の中性子過剰核の高エネルギー分解能ガンマ線スペクトロスコピー(23aBD 理論核物理領域,実験核物理領域合同不安定核II(合同),理論核物理領域)

大田晋輔, 橋本佳子, 井手口栄治, 家城和夫, 岩佐直仁, 岩崎弘典, 菅野祥子, 近藤洋介, 久保敏幸, 栗田和好, 峯村俊行, 下浦享, 道正新一郎, 本林透, 村上哲也, 中林匠, 中村隆司, 新倉潤, 奥村俊文, 大西健夫, 櫻井博儀, 篠原摩有子, 青井考, 鈴木大介, 鈴木賢, 玉城充, 田中鐘信, 栂野泰宏, 若林泰夫, 山田一成, 竹下英里, 武内聡, 鈴木宏, 馬場秀忠, 福地智則, 福井利晃

日本物理学会講演概要集65 ( 1 ) 60 - 60 2010

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DOI： 10.11316/jpsgaiyo.65.1.1.0_60_4

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24aZF-3 In-beam γ-ray spectroscopy of ^<32>Mg

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

Meeting Abstracts of the Physical Society of Japan63 ( 1 ) 72 - 72 2008

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Language：Japanese Publisher：The Physical Society of Japan

DOI： 10.11316/jpsgaiyo.63.1.1.0_72_2

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27pWD-5 Inelastic proton scattering on the neutron rich Cr isotopes

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

Meeting Abstracts of the Physical Society of Japan61 ( 1 ) 53 - 53 2006

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Language：Japanese Publisher：The Physical Society of Japan

DOI： 10.11316/jpsgaiyo.61.1.1.0_53_1

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27pWD-4 Cluster states in ^<12>Be via α-inelastic scattering

Saito Akito, Imai Nobuaki, Iwasa Naohito, Iwasaki Hironori, Kanno Shouko, Kubono Shigeru, Kunibu Makoto, Michimasa Shin'ichiro, Motobayashi Tohru, Nakamura Takashi, Ryuto Hiromichi, Shimoura Susumu, Sakurai Hiroyoshi, Serata Masaki, Takeshita Eri, Takeuchi Satoshi, Teranishi Takashi, Ue Koji, Yamada Kazunari, Yanagisawa Yoshiyuki, Minemura Toshiyuki, Matsuyama Yuuichi U., Baba Hidetada, Aoi Nori, Gomi Tomoko, Higurashi Yoshihide, Ieki Kazuo

Meeting Abstracts of the Physical Society of Japan61 ( 1 ) 52 - 52 2006

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Language：Japanese Publisher：The Physical Society of Japan

DOI： 10.11316/jpsgaiyo.61.1.1.0_52_4

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20aSC-12 Coulomb excitation of ^<20>Mg

Iwasa N., Kubono S., Kurita K., Kurokawa M., Matsui N., Minemura T., Morikawa H., Nakamura T., Niikura M., Notani M., Ota S., Bishop S., Saito A., Sakurai H., Shimoura S., Sugawara K., Sugimoto T., Suzuki H., Suzuki T., Tanihata I., Takeshita E., Takeuchi S., Elekes Z., Teranishi T., Togano Y., Yamada K., Yamaguchi K., Yanagisawa Y., Motobayashi T., Gibelin J., Hosoi M., Ieki K., Ishikawa K., Iwasaki H., Kawai S.

Meeting Abstracts of the Physical Society of Japan61 ( 0 ) 3 - 3 2006

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Language：Japanese Publisher：The Physical Society of Japan

DOI： 10.11316/jpsgaiyo.61.2.1.0_3_3

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28aZL-12 Excited States in ^<14>O via the α Inelastic Scattering

Baba H, Ieki K, Imai N, Iwasa N, Iwasaki H, Kanno S, Kubono S, Kunibu M, Michimasa S, Motobayashi T, Nakamura T, Shimoura S, Sakurai H, Serata M, Takeshita E, Takeuchi S, Teranishi T, Ue K, Yamada K, Yanagisawa Y, Minemura T, Matsuyama U, Saito A, Akiyoshi H, Aoi N, Gomi T, Higurashi Y

Meeting Abstracts of the Physical Society of Japan59 ( 1 ) 37 - 37 2004

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Language：Japanese Publisher：The Physical Society of Japan

DOI： 10.11316/jpsgaiyo.59.1.1.0_37_4

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Coulomb Dissociation of ^<23>Al

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

Meeting Abstracts of the Physical Society of Japan58 ( 1 ) 47 - 47 2003

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Language：Japanese Publisher：The Physical Society of Japan

DOI： 10.11316/jpsgaiyo.58.1.1.0_47_1

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Study of the ^<26>Si (p, γ)^<27>P Reaction with the Coulomb-Dissociation Method

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

Meeting Abstracts of the Physical Society of Japan58 ( 1 ) 47 - 47 2003

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Language：Japanese Publisher：The Physical Society of Japan

DOI： 10.11316/jpsgaiyo.58.1.1.0_47_2

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γ-ray angular correlation at ^<12>Be+αinelastic scattering reaction

Matsuyama Y. U., Gomi T., Higurashi Y., Ieki K., Imai N., Iwasa N., Iwasaki H., Kanno S., Kubono S., Kunibu M., Michimasa S., Shimoura S., Murakami H., Nakamura T., Sakurai H., Serata M., Takeshita E., Takeuchi S., Teranishi T., Ue K., Yamada K., Yanagisawa Y., Minemura T., Saito A., Baba H., Motobayashi T., Akiyoshi H., Ando Y., Aoi N.

Meeting Abstracts of the Physical Society of Japan58 ( 2 ) 22 - 22 2003

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Language：Japanese Publisher：The Physical Society of Japan

DOI： 10.11316/jpsgaiyo.58.2.1.0_22_4

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^<14>O(α, α') reaction in inverse kinematics

Baba H., Ieki K., Imai N., Iwasa N., Iwasaki H., Kanno S., Kubono S., Kunibu M., Michimasa S., Motobayashi T., Nakamura T., Shimoura S., Sakurai H., Serata M., Takeshita E., Takeuchi S., Teranishi T., Ue K., Yamada K., Yanagisawa Y., Minemura T., Matsuyama Y. U., Saito A., Akiyoshi H., Aoi N., Gomi T., Higurashi Y.

Meeting Abstracts of the Physical Society of Japan58 ( 1 ) 46 - 46 2003

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Language：Japanese Publisher：The Physical Society of Japan

DOI： 10.11316/jpsgaiyo.58.1.1.0_46_4

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24aWK-10 ^<14>O+^Heにおける入射核破砕反応

馬場秀忠, 家城和夫, 今井伸明, 岩佐直仁, 岩崎宏典, 菅野祥子, 久保野茂, 國分誠, 道正新一郎, 本林透, 中村隆司, 下浦亨, 櫻井博儀, 世良田真来, 竹下英里, 武内聡, 寺西高, 上浩二, 山田一成, 柳沢善行, 峯村俊行E, 松山裕一, 斎藤明登, 秋吉啓充, 青井孝, 五味朋子, 日暮祥英

日本物理学会講演概要集57 ( 1 ) 35 - 35 2002

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Language：Japanese Publisher：一般社団法人日本物理学会

DOI： 10.11316/jpsgaiyo.57.1.1.0_35_1

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25aWK-2 ^<34>Si+^2H反応によるγ線スペクトロスコピー

岩佐直仁, 衣川裕人, 馬場秀忠, 國分誠, 二上宇内, 桜井博儀, 青井考, 福田直樹, 石原正泰, 熊谷秀和, 久保敏幸, 本林透, 秋吉啓充, 柳沢善行, 米田健一郎, 日暮祥英, 下浦享, 久保野茂, 岩崎弘典, 道正新一郎, Zs. Fulop, 家城和夫, 村上浩之, 安藤嘉章, 武内聡, 峯村俊行, 五味朋子, 斉藤明登

日本物理学会講演概要集57 ( 1 ) 42 - 42 2002

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Language：Japanese Publisher：一般社団法人日本物理学会

DOI： 10.11316/jpsgaiyo.57.1.1.0_42_2

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Professional Memberships

日本物理学会

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Works

Michigan State Univ.:ミシガン州立大学超伝導サイクロトロン研究所における``Neutron Wall''を用いた実験(日本私学振興財団海外派遣交流経費) Other

4 1995

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3 1996

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Work type：Other

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Michigan State Univ. National Superconducting Cyclotron Lab. Research Assoc. & Visiting Assoc. Prof. Other

4 1991

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3 1993

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Work type：Other

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Research Projects

EOS for High-Density Neutron-Rich Nuclear Matter

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research

Murakami Tetsuya, TAKETANI Atsushi, MIZOI Yutaka, KURITA Kazuhiro, BABA Hidetada, Lynch W., Tsang M. B., Yennello S. J., Xiao Z., Lukasik J., Pawlowski P., Hong B., Pollacco E.

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6 2012 - 3 2017

Grant number：24105004

Grant amount：\168740000 （ Direct Cost: \129800000 、 Indirect Cost：\38940000 ）

Neutron star is believed to be created as a remnant of super nova explosion. In order to determine a thermodynamical character of outer core of neutron star through terrestrial experiments we have performed a series of measurements using RIKEN Radio Isotope Beam Factory (RIBF). Various central collisions between neutron-rich tin nucleus and normal tin nucleus were measured. The density achieved by the collisions nearly corresponds to the one for the outer core of neutron star. Both positive and negative pions emitted from the high density nuclear matter were detected by a newly developed large time projection chamber which can provide 3-dimensional image of their tracks. We have successfully accumulated data with higher statistics than planned. Data analysis to extract precise yield ratios between charged pions is in progress. We expect to constrain the EOS for neutron star soon.

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A study of compressibility in nuclei far from the stability line

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research

SHIMOURA Susumu, TERANISHI Takashi, IWASAKI Hironori, KUBONO Shigeru, MOTOBAYASHI Tohru, AOI Nori

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1999 - 2001

Grant number：11440081

Grant amount：\4100000 （ Direct Cost: \4100000 ）

We have studied (α, α') reactions for proton- or neutron-rich unstable nuclei by using inverse kinematics in order to get a milestone for investigating E0 giant resonances and nuclear compressibility. A Liquid He target system was constructed where materials in a path of gamma rays from excited states were minimized and stability of the temperature were maintained through a 2-weeks experiment. The thickness of the target are selectable in a range of 100-250 mg/cm^2. By using 60-MeV secondary beams from the fragment separator RIPS in RIKEN accelerator facility, (a) ^<14>O+α and (b) ^<12>Be+α scatterings were measured. The detector system consisted of a hodoscope of plastic scintillators for charged particle detection and an array of 68 NaI(TI) scintillators for gamma rays. (a) The transition to 0^+, 1^-, 2^+ and 3^- excited states in ^<14>O were identified and the angular distributions of the differential cross sections were characterized by the transferred angular momenta. We also measured production cross sections of various fragments and found that production of carbon isotopes are much larger than a prediction of a semi-empirical rule. (b) We found an isomeric 0^+ state at 2.24 MeV just above the first excited state of the ^<12>Be, where its spin was determined by a gamma-gamma angular correlation pattern. Alpha inelastic scattering to the 2+ and 1- states were also measured, where the angular distributions are characterized by the transferred angular momenta. We newly found that the (α, t) and (α, ^3He) nucleon transfer reactions have significant cross sections, which gives a new spectroscopic tool for single particle states in unstable nuclei.

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Measurements of thermonuclear reaction rates for light nuclei with intermediate-energy RI beams

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research

MOTOBAYASHI Toru, IZUMOTO Toshiaki, SHIMOMURA Susumu, IEKI Kazuo, KAJINO Toshitaka, SHIBAZAKI Noriaki

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1998 - 2000

Grant number：10304021

Grant amount：\36800000 （ Direct Cost: \36800000 ）

Using the fast RI beams provided by the RIPS beam course at RIKEN Accelerator Research Facility, we measured several reactions in the hot pp-mode, hot CNO cycle, and rp process. An experiment to test the validity of the Coulomb dissociation method was also performed. The reaction mechanism of the ^8B Coulomb dissociation, which is related to the solar neutrino problem, was investigated.
1 The reactions in the hot pp mode, ^8B(p,γ)^9C, ^<11>C(p,γ)^<12>N, and ^<12>N(p,γ)^<13>O, were studied by the Coulomb dissociation. The results were considerably different from what have been used in network calculations for the hot pp mode.
2 The Coulomb dissociation of ^<13>N through its 1/2^+ state was studied. From the measured cross section, the radiative width Γ_γ=0.51±0.04 eV was extracted. Its agreement with direct measurements, 0.50±0.04 eV, demonstrates the validity of the method.
3 Inelastic scattering of ^<15>O to its 3/2+ state at 6.793 MeV was measured. An upper limit of the transition probability was extracted. The result suggests only small influence of the state to the CNO cycle nuclear burning.
4 Coulomb dissociation of ^<23>A1 was measured to determine the ^<22>Mg(p,y)^<23>A1 reaction. The E2 transition to the first excited state, which is considered to be important in the rp-process, was consistent with the evaluation by Wiescher et al., thouth the error is large.
5 Cross sections in a wide angular range for the ^8B Coulomb dissociation was analyzed. Together with the data obtained by our GSI experiment at a higher incident energy, the mixture of the E2 transitions was expected to be small.

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金属中のD+D反応からの高エネルギー陽子放出

立教大学立教大学研究奨励助成金

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4 1997 - 3 1998

Grant type：Competitive

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大型中性子検出器を用いた核物理

科学研究費助成事業

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4 1996 - 3 1998

Grant type：Competitive

大型中性子検出器を用いた核物理

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クーロン分解反応を用いた$(n,\gamma)$反応の研究

日本学術振興会科学研究費助成事業

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4 1996 - 3 1997

Grant type：Competitive

クーロン分解反応を用いた$(n,\gamma)$反応の研究

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Reaction mechanism of Coulomb dissociation induced by high-speed heavy ions

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research

MOTOBAYASHI Toru, SAKURAGI Hiroyuki, IZUMOTO Toshiaki, SHIMOURA Susumu, IEKI Kazuo

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1996 - 1997

Grant number：08454069

Grant amount：\7000000 （ Direct Cost: \7000000 ）

Reaction mechanism of intermediate-energy Coulomb dissociation has been studied by precise measurements of angular distribution and angular correlation of the fragments. A large vacuum chamber has been constructed as a housing of a plastic scintillator hodoscopes. The chamber was installed in a experimental hail of RIKEN Accelerator Research Facility, and was used for experiments with radioactive nuclear beams. Background-free measurements become possible for the relative energy lower than 0.5 MeV.
The ^<208>Pb(^8B, ^7Be p)^<208>Pb and ^<208>Pb(^9C, ^8B p) ^<208>Pb reactions were studied. The primary aim of the measurements are to determine the ^7Be (p, gamma)^8B and ^8B(p, gamma)^9C reactions. The former reaction produce high-energy solar-neutrinos, and the latter is a key reaction in the hot pp mode nuclear burning in stars. In the Coulomb dissociation method, a one-step El transition mechanism is assumed in the process of extracting the (p, gamma) cross section. However, possible small mixture of E2 transition had been pointed out. We notice that the fragments' angular distributions are different for El and E2 transitions. In the measurements, the scattering angle up to 100 was covered by the new setup to obtain complete distributions. The results suggested very small E2 components which do not affect the extracted (p, gamma) cross sections.

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中性子相関の研究

科学研究費助成事業

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4 1995 - 3 1996

Grant type：Competitive

中性子相関の研究

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Gdを含有する液体シンチレーターを用いた中性子検出

立教大学立教大学研究奨励助成金

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4 1994 - 3 1995

Grant type：Competitive

個人研究

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陽子過剰核における陽子-陽子相関

日本学術振興会科学研究費助成事業

下浦享, 家城和夫, 本林透

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1995 - 1995

Grant number：07223211

Grant amount：\2000000 （ Direct Cost: \2000000 ）

安定線から離れた原子核のバレンス核子間の相関を調べる反応として、荷電変換反応に関する検討を行った。クーロン力の働く陽子-陽子相関の研究の準備として、クーロン力の働かない中性子-中性子相関を調べるために、核子あたり65MeVの^<11>Li核の荷電変換反応、^<11>Li(p,n)^<11>Be^*および^<11>Li(d,2n)^<11>Be^*の解析を行った。2つのバレンス中性子が非常に弱く束縛されている^<11>Li核のアイソバリックアナログ状態(IAS)を発見した。IASのエネルギーおよび崩壊幅から、陽子(p)および中性子(n)の軌道に関する情報が得られ、s軌道の成分の大きさが求められた。また、ガモフテラー型の荷電変換反応の解析から、ベータ崩壊の測定でよく知られている^<11>Be核の第1励起状態への遷移強度と比較して、非常に大きな確率で重陽子が放出されることが明らかになり、この強度分布から中性子-中性子相関の強さが明らかにできると期待される。
上記実験結果に基づき、陽子過剰核^<17>Neおよび^<20>Mg核の荷電変換反応実験の設計を行った。測定すべき核(^<15>Oおよび^<18>Ne)の原子番号(Z)が大きいため、粒子識別に工夫が必要となる。Zの識別の分解能を向上させるために用いるSi半導体検出器(マイクロストリップ型)を購入し、この検出器の性能評価を行っている。また、同位体の識別のためにエネルギー減衰を用いた2段階の飛行時間差法を用いることによって十分な粒子識別が可能となることが明らかとなり、現在、これらを用いた検出器システムを設計中である。

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Explosive Nucleosynthesis with Unstable Nuclei - Complementary Studies Using Low- and Intermediate-Energy Unstable Nuclear Beams -

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research

MOTOBAYASHI Tohru, ARNOULD Marcel, KAJINO Toshitaka, KUBONO Shigeru, SHIMOURA Susumu, IEKI Kazuo, BAYE Daniel, GALSTER Wilfried, LELEUX Pierre, DELBAR Theirry

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1994 - 1995

Grant number：06044205

Grant amount：\10400000 （ Direct Cost: \10400000 ）

Using beams of unstable nuclei provided by RIKEN Ring Cyclotron with intermediate energies and by Cyclotron complex of Louvain la Neuve with low energies, explosive nuclear burning processes have been studied experimentally. The Coulomb dissociation method was employed at RIKEN for an extensive study of the process ^<208>Pb(^8B,^7Be, p)^<208>Pb, which simulate the ^7Be(p, gamma)^8B reaction, a key process for the solar neutrino problem. Our results suggest very small E2 component, which has been estimated theoretically to cause a serious problem for ^8B Coulomb dissociation results. A new determination of S_<17> will be achieved by the second experiment. We also performed an experiment of ^<12>N dissociation related to the hot pp mode burning process.
A direct measurement of the reaction ^<19>Ne(p, gamma)^<20>Na was performed at Louvain la Neuve. This reaction was regarded as a key of mass flow from CNO to NeNa region. The experimental could only give an upper limit of the cross section, which is already much smaller than predictions. Another direct measurement was performed for the ^<13>N(p, gamma)^<14>O reaction, a key to ignite hot CNO cycle from the regular CNO cycle. This experiment was aimed at providing a fair and precise comparison between the Coulomb dissociation and direct capture methods by improving the accuracy of data, because both methods were once applied for the ^<13>N(p, gamma)^<14>O and the results agreed with each other within errors. A gamma-ray detection setup with a high efficiency was build at Rikkyo and brought to Louvain la Neuve to measure 5.17 MeV gamma-rays from the radiative capture reaction induced by radioactive ^<13>N beams with an hydrogen target. Analysis is in progress.

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陽子過剰核における陽子-陽子相関

日本学術振興会科学研究費助成事業

下浦享, 家城和夫, 本林透

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1994 - 1994

Grant number：06234213

Grant amount：\2100000 （ Direct Cost: \2100000 ）

安定線から離れた原子核のバレンス核子間の相関を調べる反応として、荷電変換反応に関する検討を行った。クーロン力の働く陽子-陽子相関の研究の準備として、クローン力の働かない中性子-中性子相関を調べるために、^<11>Li核の荷電変換反応、^<11>Li(p,n)^<11>Be^*および^<11>Li(d,2n)^<11>Be^*、を理化学研究所の二次ビームラインをもちいて核子あたり65MeVの入射エネルギーで逆運動学の条件で測定した。^<11>Li核は2つのバレンス中性子が非常に弱く束縛されており、これが荷電変換反応によって重陽子に変換する断面積の大きさから相関の強さを調べる。これまで解析で、ベータ崩壊の測定でよく知られている^<11>Be核の第1励起状態への遷移強度と比較して、非常に大きな確率で重陽子が放出されることが明らかになった。この実験ではさらに^<11>Li核中の1つの中性子と標的の重陽子との準弾性散乱も観測されており、この割合からも中性子-中性子相関の強さが明らかにできると期待される。これらのデータ解析は現在進行中である。
上記実験結果に基づき、陽子過剰核^<17>Neおよび^<20>Mg核の荷電変換反応実験の設計を行った。測定すべき核(^<15>Oおよび^<18>Ne)の原子番号(Z)が大きいため、粒子識別に工夫が必要となり、そのためのシミュレーションを行っている。Zの識別の分解能を向上させるためにSi半導体検出器、同位体の識別のためにエネルギー減衰を用いた2段階の飛行時間差法を用いることによって十分な粒子識別が可能となることが明らかとなった。またベータ崩壊の強度との比較を行うために、NaIシンチレータを用いたガンマ線との同時計測が重要であることが明らかになった。

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中性子過剰原子核のクラスター状態の探査

日本学術振興会科学研究費助成事業

下浦享, 家城和夫, 本林透

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1993 - 1993

Grant number：05243212

Grant amount：\2000000 （ Direct Cost: \2000000 ）

軽い中性子過剰核のクラスター状態の探査を行うための核反応の候補につのうち最も簡単と考えられる^6He+^4He->^<10>Be^*->n+^9Be反応に関して検討を行った。この反応は、逆反応のデータが存在し、重心エネルギー2.5MeV付近にピークをもつバンプ状の構造があることが報告されている。しかしながら、この反応は反応生成物である^6Heの量を放射分析によって求めており、このことから全反応断面積しか得られていない。共鳴状態であるかどうか、またスピン・パリティなどの量子数を求めるためには角度分布を測定することが不可欠であり、そのための実験装置の設計を行っている。
本研究の特色である、厚い標的を用いて中性子のエネルギースペクトルとその角度分布から反応の励起関数を一度に求める方法の具体的な検討を行った。興味のある領域(Ecm=1-5MeV)をカバーするために、長さ80cmのHeガス標的を用い、分解能の要請から標的から1.5mの位置に中性子検出器を配置すればよいことが明らかになった。
中性子検出のための(直径20cm、厚さ5cm)の液体シンチレータを購入し、現在、性能評価を行っている。測定すべき中性子のエネルギーが5-10MeVであるため、立教大学コックロフトウォルトン型加速器で生成される14MeV中性子を用いて検出効率の絶対値および分解能の評価を行っている。またトリガーから反応しなかったビームを除くための検出器系の設計を行い、薄いプラスチックシンチレータおよびSi半導体検出器の組み合わせを用いる予定である。

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COULOMB EXCITATION OF LIGHT NEUTRON-RICH NUCLEI

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research

MOTOBAYASHI Tohru, SHIMOURA Susumu, GEN Kenji, IEKI Kazuo, SHIRATO Shoji

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1992 - 1993

Grant number：04452029

Grant amount：\7000000 （ Direct Cost: \7000000 ）

The Coulomb excitation of a very neutron-rich nucleus ^<32>Mg to its 2^+ state was studied using an unstable nuclear beam of ^<32>Mg at 49 MeV/u with a ^<208>Pb target. The beam was generated by projectile fragmentation reaction induced by 94 MeV/u ^<40>Ar ions bombarding a ^9Be target, and separated by the RIPS facility, a system with essentially two dipole magnets with an energy loss degradeer, of RIKEN (the Institute of Physical and Chemical Research). A stuck of 64 NaI(Tl) scintillators were settled around the target to detect gamma-rays from the 2^+ state of ^<32>Mg in coincidence with inelastically scattered ^<32>Mg nuclei detected by silicon counter telescope consisting of five/400 mum thick silicon detectors. The silicon telescope provided particle identification to select the inelastic scattering. The relevant inelastic scattering cross section was obtained by integrating the gamma-ray yield with corrections due to the Doppler shift of the photon energy and the detection efficiencies of the gamma-ray detector and the silicon counter telescope.
The B(E2) value of 426(〕SY.+-.〔)34 e^2fm^2 was extracted by a coupled channel analysis. The value is in good agreement with a recent shell model prediction and also with a global phenomenological expression of the N_pN_n scheme. The major ingredient of these models is an obliteration of the N=20 shell closure. Therefore the presenct result confirms a large deformation of ^<32>Mg suggested by the low excitation energy of the 2^+ state, and points to the vanishing of the N=20 shell gap. The success of the present study opens up a new profound field of research to investigate a large number of unknown 0^+-2^+ transitions in unstable nuclei.

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低エネルギ- ^7Li(t,n)^9Be反応断面積の測定

日本学術振興会科学研究費助成事業

本林透, 梶野敏貴, 家城和夫, 白土〓二

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1991 - 1991

Grant number：03640283

Grant amount：\2300000 （ Direct Cost: \2300000 ）

非一様ビッグバンモデルによる重い元素の合成の可能性を確かめるのに必要な、 ^7Li(t,n)^9Be反応の断面積を、逆反応 ^9Be(n,t)^7Liにより測定した。今回は三重水素エネルギ-2.0MeVに相当する条件で実験を行った。立教大学のコッククロフト=ワルトン型加速器からの重陽子ビ-ムを用い、 ^3H(d,n)^4He反応により高速中性子を発生させた。重陽子のエネルギ-は200keVで、散乱角90度での中性子エネルギ-は14.1MeVであった。二次タ-ゲット ^9Beの厚さは1mg/cm^2で、 ^9Be(n,t)^7Li反応によって発生する三重水素は大立体角のシリコン検出器によって測定された。信号は測定室に置かれたカマックデ-タ処理装置によって解析された。得られたデ-タから微分断面積を積分して反応全断面積を求めた結果は19.3±4.8mbであった。誤差には、後方の散乱角では測定が不可能となることによるものが含まれている。断面積は ^7Li(^3He,p)^9Be反応の断面積からDWBA理論、複合核理論等を用いて推定した上限値11.2mbよりもかなり大きい。もし、この断面積の傾向がより低いエネルギ-まで同じように続くとすると、非一様ビッグバンモデルによる ^9Beの合成率はかなり大きく、原始宇宙でも既に更に重い ^<11>B等の元素が生成されていた可能性を示唆する。
今後は、より低いエネルギ-(三重水素の1.5MeVに相当する条件)での測定を行い、今回の結果と合わせて理論的予測を評価し、核反応機構を明かにし、非一様ビッグバンモデルによる中重元素の合成率を求めたい。また、上に述べたように、今回の実験方法では後方角度の測定が困難である。これは、より低いエネルギ-では更に深刻となるので、別の方法を開発し、実際の合成過程が起きる条件での実験を行いたい。現在検討中なものは、生成された三重水素の定量を液体シンチレ-タ-で行うものである。

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荷電粒子多重度検出器の研究

日本学術振興会科学研究費助成事業

家城和夫

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1989 - 1989

Grant number：01740163

Grant amount：\1200000 （ Direct Cost: \1200000 ）

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Heavy Ion Reaction

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Grant type：Competitive

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Primodial Nuclear Synthesis

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Grant type：Competitive

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Structure and Reaction of Neutron-Rich Nuclei

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Grant type：Competitive

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中性子過剰核の構造と反応

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Grant type：Competitive

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宇宙初期における元素合成

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Grant type：Competitive

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重イオン核反応の研究

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Grant type：Competitive

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