研究者詳細 - 西畑洸希

お知らせ

写真a

ニシバタ　ヒロキ

西畑洸希

NISHIBATA HIROKI

所属

理学研究院物理学部門助教
理学部物理学科（併任）
理学府物理学専攻（併任）

連絡先

電話番号

0928024350

プロフィール

中性子過剰な原子核の構造研究 TRIUMF研究所などにおいて、スピンの向きが空間的に揃った(スピン偏極した)原子核からのベータ崩壊を用いてその娘核の励起状態の構造を調べる研究を行っている。また、その研究に向けた検出器開発などを九州大学加速器ビーム応用科学研究センターにおいて推進している。

ホームページ

http://ne.phys.kyushu-u.ac.jp/index.html

学位

博士(理学)

経歴

理化学研究所基礎科学特別研究員 (2019/4 - 2019/9)

研究テーマ・研究キーワード

研究テーマ：スピン偏極核ベータ核分光法を用いた中性子過剰なAl同位体の励起状態

研究キーワード：不安定原子核、スピン偏極

研究期間： 2019年4月
研究テーマ：スピン整列ビームを用いた原子核電磁気モーメントの測定

研究キーワード：原子核モーメント, スピン整列

研究期間： 2016年4月 - 2019年10月
研究テーマ：スピン偏極Naビームを用いた中性子過剰Mg同位体の系統的構造研究

研究キーワード：不安定原子核, スピン偏極

研究期間： 2014年4月 - 2019年3月
研究テーマ：不安定核核融合反応を用いた高スピン状態の研究

研究キーワード：不安定原子核

研究期間： 2011年4月 - 2013年3月

受賞

AAPPS-JPS Award

2024年6月
核物理談話会新人賞

2018年10月核物理談話会

論文

Structure of the neutron-rich nucleus 30Mg 査読国際誌

@H.Nishibata, K.Tajiri, T.Shimoda, A.Odahara, S.Morimoto, S.Kanaya, A.Yagi, H.Kanaoka, M.R.Pearson, C.D.P.Levy, M.Kimura, N.Tsunoda, T.Otsuka

Physical Review C 102 054327-1 - 054327-14 2020年11月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： https://doi.org/10.1103/PhysRevC.102.054327
Interplay between nuclear shell evolution and shape deformation revealed by the magnetic moment of ⁷⁵ Cu 査読

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

Nature Physics 15 ( 4 ) 321 - 325 2019年4月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1038/s41567-018-0410-7
Structure of Mg 31 Shape coexistence revealed by β-γ Spectroscopy with spin-polarized Na 31 査読国際誌

99 ( 2 ) 2019年2月

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記述言語：英語掲載種別：研究論文（学術雑誌）

The level structure of Mg31, which is located close to the region of the N = 20 "island of inversion" in the nuclear chart, has been studied by β-γ spectroscopy with spin-polarized Na31. In Mg31, shape coexistence is expected as a result of subtle competition between the spherical mean field and the nuclear correlation which favors deformed configurations. In the present work, our unique method utilizing the anisotropic β decay of spin-polarized Na31 enables us to firmly assign the spins of all positive-parity excited levels in Mg31 below the neutron separation energy at 2.3 MeV. Furthermore, by constructing a very detailed decay scheme, including two newly found levels, the spins of negative-parity levels are restricted. The examination of the spectroscopic information shows that the deformed rotational bands with Kπ=1/2+ and 1/2-, which have very similar structures to those observed in a higher excitation energy region of Mg25, appear as the ground-state and low-lying bands, respectively, in Mg31. The experimental levels of Mg31 are compared, on the level-by-level basis, with two types of theoretical calculations. These are, first, the antisymmetrized molecular dynamics (AMD) plus generator coordinate method (GCM) and, second, the shell model with the EEdf1 interaction, which is microscopically derived from chiral effective field theory. It is understood that 8 levels among the experimental 11 levels are the members of four types of largely deformed rotational bands and 2 levels are of spherical nature. The 1/2+ 2.244-MeV level is successfully reproduced by the shell-model calculation with a dominant 4p4h configuration. The present work clearly demonstrates that various structures coexist in a low excitation energy region of Mg31.

DOI： 10.1103/PhysRevC.99.024322
Shape coexistence in the N = 19 neutron-rich nucleus ³¹Mg explored by β–γ spectroscopy of spin-polarized ³¹Na 査読国際誌

767 81 - 85 2017年4月

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記述言語：英語掲載種別：研究論文（学術雑誌）

The structure of excited states in the neutron-rich nucleus ³¹Mg, which is in the region of the “island of inversion” associated with the neutron magic number N=20, is studied by β–γ spectroscopy of spin-polarized ³¹Na. Among the ³¹Mg levels below the one neutron separation energy of 2.3 MeV, the spin values of all five positive-parity levels are unambiguously determined by observing the anisotropic β decay. Two rotational bands with K^π=1/2⁺ and 1/2⁻ are proposed based on the spins and energies of the levels. Comparison on a level-by-level basis is performed between the experimental results and theoretical calculations by the antisymmetrized molecular dynamics (AMD) plus generator coordinate method (GCM). It is found that various nuclear structures coexist in the low excitation energy region in ³¹Mg.

DOI： 10.1016/j.physletb.2017.01.049
High-spin states in la 136 and possible structure change in the N=79 region 査読国際誌

H. Nishibata, R. Leguillon, A. Odahara, T. Shimoda, C. M. Petrache, Y. Ito, J. Takatsu, K. Tajiri, N. Hamatani, R. Yokoyama, E. Ideguchi, H. Watanabe, Y. Wakabayashi, K. Yoshinaga, T. Suzuki, S. Nishimura, D. Beaumel, G. Lehaut, D. Guinet, P. Desesquelles, D. Curien, K. Higashiyama, N. Yoshinaga

Physical Review C - Nuclear Physics 91 ( 5 ) 2015年5月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1103/PhysRevC.91.054305
First spectroscopic study of odd-odd ⁷⁸Cu 査読国際誌

L.G.Pedersen, E.Sahin, A.Gorgen, F.L.Bello Garrote, Y.Tsunoda, T.Otsuka, M.Niikura, S.Nishimura, Z.Xu, H.Baba, G.Benzoni, F.Browne, A.M.Bruce, S.Ceruti, F.C.L.Crespi, R.Daido, G.de Angelis, M.-C.Delattre, Zs.Dombradi, P.Doornenbal, Y.Fang, S.Franchoo, G.Gey, A.Gottardo, T.Isobe, P.R.John, H.S.Jung, I.Kojouharov, T.Kubo, N.Kurz, I.Kuti, Z.Li, G.Lorusso, I.Matea, K.Matsui, D.Mengoni, T.Miyazaki, V.Modamio, S.Momiyama, A.I.Morales, P.Morfouace, D.R.Napoli, F.Naqvi, @H.Nishibata, A.Odahara, R.Orlandi, Z.Patel, S.Rice, H.Sakurai, H.Schaffner, L.Sinclair, P.-A.Soderstrom, D.Sohler, I.G.Stefan, T.Sumikama, D.Suzuki, R.Taniuchi, J.Taprogge, Z.Vajta, J.J.Valiente-Dobon, H.Watanabe, V.Werner, J.Wu, A.Yagi, M.Yalcinkaya, R.Yokoyama, K.Yoshinaga

Physical Review C 2023年4月

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記述言語：英語掲載種別：研究論文（学術雑誌）
Nuclear magnetic moment of the neutron-rich nucleus 21O 査読国際誌

Y. Ishibashi, A. Gladkov, Y. Ichikawa, A. Takamine, H. Nishibata, T. Sato, H. Yamazaki, T. Abe, J.M. Daugas, T. Egami, T. Fujita, G. Georgiev, K. Imamura, T. Kawaguchi, W.Kobayashi, Y.Nakamura, A.Ozawa, M.Sanjo, N.Shimizu, D.Tominaga, L.C.Tao, K.Asahi, H.Ueno

Physical Review C 2023年2月

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記述言語：英語掲載種別：研究論文（学術雑誌）
Gamow-Teller decay of 142Te to 142I 査読国際誌

B. Moon, C.-B. Moon, A. Odahara, R. Lozeva, S. Nishimura, C. Yuan, F. Browne, P.Doornenbal, G. Lorusso, Z. Patel, S. Rice, L. Sinclair, P.-A. Soderstrom, T. Sumikama, H. Watanabe, J. Wu, Z.Y. Xu, A. Yagi, D.S. Ahn, H. Baba, F.L. Bello Garrote, R. Daido, J. M. Daugas, F. Didierjean, Y. Fang, N. Fukuda, B. Hong, E. Ideguchi, N. Inabe, T. Ishigaki, T. Isobe, H. S. Jung, D. Kameda, I. Kojouharov, T. Komatsubara, T. Kubo, Y.K. Kwon, C.S. Lee, P. Lee, S. Morimoto, D. Murai, M. Niikura, @H. Nishibata, I. Nishizuka, H. Sakurai, Y. Shimizu, H. Suzuki, H. Takeda, K. Tshoo, R.Yokoyama

Physical Review C 2023年1月

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記述言語：英語掲載種別：研究論文（学術雑誌）
Various nuclear structures in 140Xe studied by β decay of ground and isomeric states in 140I 査読国際誌

2022年4月

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記述言語：英語掲載種別：研究論文（学術雑誌）
First observation of the π0h11/2 X ν0h9/2 partner orbital configuration in the odd-odd 138I nucleus 査読国際誌

2022年3月

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記述言語：英語掲載種別：研究論文（学術雑誌）
Persistence of the Z=28 shell gap in A=75 isobars: Identification of a possible (1/2-)μs isomer in 75Co and β decay to 75Ni 査読国際誌

2021年6月

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記述言語：英語掲載種別：研究論文（学術雑誌）
Nuclear structure of Te isotopes beyond neutron magic number N = 82 査読国際誌

B.Moon, A.Jungclaus, H.Naidja, A.Gargano, R.Lozeva, C.-B.Moon, A.Odahara, G.S.Simpson, S.Nishimura, F.Browne, P.Doornenbal, G.Gey, J.Keatings, G.Lorusso, Z.Patel, S.Rice, M.Si, L.Sinclair, P.-A.Soderstrom, T.Sumikama, J.Taprogge, H.Watanabe, J.Wu, Z.Y.Xu, A.Yagi, D.S.Ahn, H.Baba, F.L.Bello Garrote, S.Bonig, R.Daido, J.M.Daugas, F.Didierjean, F.Drouet, Y.Fang, N.Fukuda, R.Gernhauser, B.Hong, E.Ideguchi, S.Ilieva, N.Inabe, T.Ishigaki, T.Isobe, H.S.Jung, D.Kameda, I.Kojouharov, T.Komatsubara, T.Kroll, T.Kubo, N.Kurz, Y.K.Kwon, C.S.Lee, P.Lee, Z.Li, A.Montaner-Piza, S.Morimoto, K.Moschner, D.Mucher, D.Murai, M.Niikura, @H.Nishibata, I.Nishizuka, R.Orlandi, H.Sakurai, H.Schaffner, Y.Shimizu, K.Steiger, H.Suzuki, H.Takeda, K.Tshoo, Zs.Vajta, A.Wendt, R.Yokoyama, K.Yoshinaga

Physical Review C 103 034320-1 - 034320-15 2021年3月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： https://doi.org/10.1103/PhysRevC.103.034320
High-spin states in 35S 査読国際誌

@S.Go, E.Ideguchi, R.Yokoyama, N.Aoi, F.Azaiez, K.Furutaka, Y.Hatsukawa, A.Kimura, K.Kisamori, M.Kobayashi, F.Kitatani, M.Koizumi, H.Harada, I.Matea, S.Michimasa, H.Miya, S.Nakamura, M.Niikura, @H.Nishibata, N.Shimizu, S.Shimoura, T.Shizuma, M.Sugawara, D.Suzuki, M.Takaki, Y.Toh, Y.Utsuno, D.Verney, A.Yagi

Physical Review C 103 034327-1 - 034327-8 2021年3月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： https://doi.org/10.1103/PhysRevC.103.034327
Observation of new neutron-rich isotopes in the vicinity of 110Zr 招待査読国際誌

T.Sumikama, N.Fukuda, N.Inabe, D.Kameda, T.Kubo, Y.Shimizu, H.Suzuki, H.Takeda, K.Yoshida, H.Baba, F.Browne, A.M.Bruce, R.Carroll, N.Chiga, R.Daido, F.Didierjean, P.Doornenbal, Y.Fang, G.Gey, E.Ideguchi, T.Isobe, S.Lalkovski, Z.Li, G.Lorusso, R.Lozeva, @H.Nishibata, S.Nishimura, I.Nishizuka, A.Odahara, Z.Patel, Zs.Podolyak, P.H.Regan, S.Rice, O.J.Roberts, H.Sakurai, G.S.Simpson, L.Sinclair, P.-A.Soderstrom, M.Tanaka, J.Taprogge, H.Watanabe, V.Werner, O.Wieland, J.Wu, Z.Y.Xu, A.Yagi

Physical Review C 102 014614-1 - 014614-5 2021年1月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： https://doi.org/10.1103/PhysRevC.103.014614
Evolution of proton single-particle states in neutron-rich Sb isotopes beyond N=82 査読国際誌

A.Jungclaus, J.M.Keatings, G.S.Simpson, H.Naidja, A.Gargano, S.Nishimura, P.Doornenbal, G.Gey, G.Lorusso, P.-A.Soderstrom, T.Sumikama, J.Taprogge, Z.Y.Xu, H.Baba, F.Browne, N.Fukuda, N.Inabe, T.Isobe, H.S.Jung, D.Kameda, G.D.Kim, Y.-K.Kim, I.Kojouharov, T.Kubo, N.Kurz, Y.K.Kwon, Z.Li, H.Sakurai, H.Schaffner, Y.Shimizu, H.Suzuki, H.Takeda, Z.Vajta, H.Watanabe, J.Wu, A.Yagi, K.Yoshinaga, S.Bonig, J.-M.Daugas, R.Gernhauser, S.Ilieva, T.Kroll, A.Montaner-Piza, K.Moschner, D.Mucher, @H.Nishibata, A.Odahara, R.Orlandi, M.Scheck, K.Steiger, A.Wendt

Physical Review C 102 034324-1 - 034324-11 2020年9月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： https://doi.org/10.1103/PhysRevC.102.034324
β-decay of 75Ni and the systematics of the low-lying level structure of neutron-rich odd-A Cu isotopes 査読国際誌

( 102 ) 034314-1 - 034314-13 2020年9月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： https://doi.org/10.1103/PhysRevC.102.034314
β-decay half-lives of 55 neutron-rich isotopes beyond the N = 82 shell gap 査読国際誌

101 042801-1 - 042801-7 2020年4月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： https://doi.org/10.1103/PhysRevC.101.042801
Shape evolution of neutron-rich 106, 108, 110Mo isotopes in the triaxial degree of freedom 査読国際誌

J.Ha, T.Sumikama, F.Browne, N.Hinohara, A.M.Bruce, S.Choi, I.Nishizuka, S.Nishimura, P.Doornenbal, G.Lorusso, P.-A.Soderstrom, H.Watanabe, R.Daido, Z.Patel, S.Rice, L.Sinclair, J.Wu, Z.Y.Xu, A.Yagi, H.Baba, N.Chiga, R.Carroll, F.Didierjean, Y.Fang, N.Fukuda, G.Gey, E.Ideguchi, N.Inabe, T.Isobe, D.Kameda, I.Kojouharov, N.Kurz, T.Kubo, S.Lalkovski, Z.Li, R.Lozeva, @H.Nishibata, A.Odahara, Zs.Podolyak, P.H.Regan, O.J.Roberts, H.Sakurai, H.Schaffner, G.S.Simpson, H.Suzuki, H.Takeda, M.Tanaka, J.Taprogge, V.Werner, O.Wieland

Physical Review C 101 044311-1 - 044311-24 2020年4月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： https://doi.org/10.1103/PhysRevC.101.044311
g Factor of the 99Zr(7/2+) Isomer: Monopole Evolution in the Shape-Coexisting Region 査読国際誌

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

Physical Review Letters 124 112501-1 - 112501-6 2020年3月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： https://doi.org/10.1103/PhysRevLett.124.112501
Beta-NMR of short-lived nucleus ¹⁷N in liquids 査読

Mototsugu Mihara, Takanobu Sugihara, Mitsunori Fukuda, Akira Homma, Takuji Izumikawa, Atsushi Kitagawa, Kensaku Matsuta, Tadanori Minaisono, Sadao Momota, Takashi Nagatomo, Hiroki Nishibata, Daiki Nishimura, Kosuke Ohnishi, Takashi Ohtsubo, Akira Ozawa, Shinji Sato, Masaomi Tanaka, Ryo Wakabayashi, Shoichi Yagi, Rikuto Yanagihara

Hyperfine Interactions 240 ( 1 ) 2019年12月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1007/s10751-019-1650-3
Properties of γ-decaying isomers in the Sn 100 region populated in fragmentation of a Xe 124 beam 査読

G. Häfner, K. Moschner, A. Blazhev, P. Boutachkov, P. J. Davies, R. Wadsworth, F. Ameil, H. Baba, T. Bäck, M. Dewald, P. Doornenbal, T. Faestermann, A. Gengelbach, J. Gerl, R. Gernhaüser, S. Go, M. Górska, H. Grawe, E. Gregor, H. Hotaka, T. Isobe, D. G. Jenkins, J. Jolie, H. S. Jung, I. Kojouharov, N. Kurz, M. Lewitowicz, G. Lorusso, R. Lozeva, E. Merchan, F. Naqvi, H. Nishibata, D. Nishimura, S. Nishimura, N. Pietralla, H. Schaffner, P. A. Söderström, K. Steiger, T. Sumikama, J. Taprogge, P. Thöle, H. Watanbe, N. Warr, V. Werner, Z. Y. Xu, A. Yagi, K. Yoshinaga, Y. Zhu

100 ( 2 ) 2019年8月

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記述言語：英語掲載種別：研究論文（学術雑誌）

A systematic study was performed of microsecond γ-decaying isomers around Sn100 produced in a fragmentation reaction of a Xe124 beam at 345 MeV/u at the Radioactive Ion Beam Factory of the RIKEN Nishina Center in Saitama, Japan. Half-lives of isomeric states in that region were remeasured allowing us to improve the currently available experimental information. Reduced transition probabilities were deduced and compared to shell-model calculations in various model spaces. The recently reported low-energy transitions in Rh92 and Ag96 were remeasured with improved precision. Additionally, experimental information on isomeric ratios, including five new ones, were extracted and compared to a previous experimental study and the sharp cutoff model of fragmentation reaction.

DOI： 10.1103/PhysRevC.100.024302
Proton Shell Evolution below 132Sn : First Measurement of Low-Lying β-Emitting Isomers in 123, 125Ag 査読国際誌

122 212502-1 - 212502-6 2019年5月

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記述言語：日本語掲載種別：研究論文（学術雑誌）

DOI： https://doi.org/10.1103/PhysRevLett.122.212502
Proton Shell Evolution below Sn 132 First Measurement of Low-Lying β -Emitting Isomers in Ag 123,125 査読

Z. Q. Chen, Z. H. Li, H. Hua, H. Watanabe, C. X. Yuan, S. Q. Zhang, G. Lorusso, S. Nishimura, H. Baba, F. Browne, G. Benzoni, K. Y. Chae, F. C.L. Crespi, P. Doornenbal, N. Fukuda, G. Gey, R. Gernhäuser, N. Inabe, T. Isobe, D. X. Jiang, A. Jungclaus, H. S. Jung, Y. Jin, D. Kameda, G. D. Kim, Y. K. Kim, I. Kojouharov, F. G. Kondev, T. Kubo, N. Kurz, Y. K. Kwon, X. Q. Li, J. L. Lou, G. J. Lane, C. G. Li, D. W. Luo, A. Montaner-Pizá, K. Moschner, C. Y. Niu, F. Naqvi, M. Niikura, H. Nishibata, A. Odahara, R. Orlandi, Z. Patel, Zs Podolyák, T. Sumikama, P. A. Söderström, H. Sakurai, H. Schaffner, G. S. Simpson, K. Steiger, H. Suzuki, J. Taprogge, H. Takeda, Zs Vajta, H. K. Wang, J. Wu, A. Wendt, C. G. Wang, H. Y. Wu, X. Wang, C. G. Wu, C. Xu, Z. Y. Xu, A. Yagi, Y. L. Ye, K. Yoshinaga

122 ( 21 ) 2019年5月

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記述言語：英語掲載種別：研究論文（学術雑誌）

The β-delayed γ-ray spectroscopy of neutron-rich Ag123,125 isotopes is investigated at the Radioactive Isotope Beam Factory of RIKEN, and the long-predicted 1/2- β-emitting isomers in Ag123,125 are identified for the first time. With the new experimental results, the systematic trend of energy spacing between the lowest 9/2+ and 1/2- levels is extended in Ag isotopes up to N=78, providing a clear signal for the reduction of the Z=40 subshell gap in Ag towards N=82. Shell-model calculations with the state-of-the-art VMU plus M3Y spin-orbit interaction give a satisfactory description of the low-lying states in Ag123,125. The tensor force is found to play a crucial role in the evolution of the size of the Z=40 subshell gap. The observed inversion of the single-particle levels around Ag123 can be well interpreted in terms of the monopole shift of the π1g9/2 orbitals mainly caused by the increasing occupation of ν1h11/2 orbitals.

DOI： 10.1103/PhysRevLett.122.212502
New isomers in ¹²⁵ Pd ₇₉ and ¹²⁷ Pd ₈₁ Competing proton and neutron excitations in neutron-rich palladium nuclides towards the N = 82 shell closure 査読

H. Watanabe, H. K. Wang, G. Lorusso, S. Nishimura, Z. Y. Xu, T. Sumikama, P. A. Söderström, P. Doornenbal, F. Browne, G. Gey, H. S. Jung, J. Taprogge, Zs Vajta, J. Wu, A. Yagi, H. Baba, G. Benzoni, K. Y. Chae, F. C.L. Crespi, N. Fukuda, R. Gernhäuser, N. Inabe, T. Isobe, A. Jungclaus, D. Kameda, G. D. Kim, Y. K. Kim, I. Kojouharov, F. G. Kondev, T. Kubo, N. Kurz, Y. K. Kwon, G. J. Lane, Z. Li, C. B. Moon, A. Montaner-Pizá, K. Moschner, F. Naqvi, M. Niikura, H. Nishibata, D. Nishimura, A. Odahara, R. Orlandi, Z. Patel, Zs Podolyák, H. Sakurai, H. Schaffner, G. S. Simpson, K. Steiger, Y. Sun, H. Suzuki, H. Takeda, A. Wendt, K. Yoshinaga

792 263 - 268 2019年5月

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記述言語：英語掲載種別：研究論文（学術雑誌）

The neutron-rich isotopes of palladium have attracted considerable interest in terms of the evolution of the N=82 neutron shell closure and its influence on the r-process nucleosynthesis. In this Letter, we present the first spectroscopic information on the excited states in ¹²⁵ Pd ₇₉ and ¹²⁷ Pd ₈₁ studied using the EURICA γ-ray spectrometer, following production via in-flight fission of a high-intensity ²³⁸ U beam at the RIBF facility. New isomeric states with half-lives of 144(4) ns and 39(6) μs have been assigned spins and parities of (23/2 ⁺ ) and (19/2 ⁺ ) in ¹²⁵ Pd and ¹²⁷ Pd, respectively. The observed level properties are compared to a shell-model calculation, suggesting the competition between proton excitations and neutron excitations in the proton-hole and neutron-hole systems in the vicinity of the doubly magic nucleus ¹³² Sn.

DOI： 10.1016/j.physletb.2019.03.053
Properties of γ-decaying isomers in the ¹⁰⁰ Sn region revisited 査読

G. Haefner, K. Moschner, A. Blazhev, P. Boutachkov, P. J. Davies, R. Wadsworth, F. Ameil, H. Baba, T. Bäck, M. Dewald, P. Doornenbal, T. Faestermann, A. Gengelbach, J. Gerl, R. Gernhäuser, S. Go, M. Górska, H. Grawe, E. Gregor, H. Hotaka, T. Isobe, D. G. Jenkins, J. Jolie, H. S. Jung, I. Kojouharov, N. Kurz, M. Lewitowicz, G. Lorusso, E. Merchan, F. Naqvi, H. Nishibata, D. Nishimura, S. Nishimura, N. Pietralla, H. Schaffner, P. A. Söderström, K. Steiger, T. Sumikama, J. Taprogge, P. Thöle, H. Watanabe, N. Warr, V. Werner, Z. Y. Xu, A. Yagi, K. Yoshinaga, Y. Zhu

50 ( 3 ) 431 - 437 2019年3月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.5506/APhysPolB.50.431
Toward the limit of nuclear binding on the N=Z line Spectroscopy of Cd 96 査読

Physical Review C 99 ( 2 ) 2019年2月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1103/PhysRevC.99.021302
Absolute optical absorption cross-section measurement of Rb atoms injected into superfluid helium using energetic ion beams 査読

Kei Imamura, Yukari Matsuo, Wataru Kobayashi, Tsuyoshi Egami, Makoto Sanjo, Aiko Takamine, Tomomi Fujita, Daiki Tominaga, Yutaro Nakamura, Takeshi Furukawa, Takashi Wakui, Yuichi Ichikawa, Hiroki Nishibata, Tomoya Sato, Aleksey Gladkov, Long Chun Tao, Takafumi Kawaguchi, Yosuke Baba, Mari Iijima, Haruka Gonda, Yasuharu Takeuchi, Rio Nakazato, Hitoshi Odashima, Hideki Ueno

Applied Physics Express 12 ( 1 ) 2019年1月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.7567/1882-0786/aaf0a9
Nuclear moments of the low-lying isomeric 1⁺ state of ³⁴Al Investigation on the neutron 1p1h excitation across N = 20 in the island of inversion 査読

Z. Y. Xu, H. Heylen, K. Asahi, F. Boulay, J. M. Daugas, R. P. de Groote, W. Gins, O. Kamalou, Koszorús, M. Lykiardopoulou, T. J. Mertzimekis, G. Neyens, H. Nishibata, T. Otsuka, R. Orset, A. Poves, T. Sato, C. Stodel, J. C. Thomas, N. Tsunoda, Y. Utsuno, M. Vandebrouck, X. F. Yang

782 619 - 626 2018年7月

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記述言語：英語掲載種別：研究論文（学術雑誌）

The nuclear g factor and quadrupole moment (Q_s) have been measured for the low-lying isomeric 1⁺ state of ³⁴Al, using the β-detected nuclear magnetic resonance (β-NMR) and quadrupole resonance (β-NQR) methods. Spin-polarized ³⁴Al isotopes were produced in a one-neutron pickup reaction induced by a ³⁶S beam on a ⁹Be target at a kinetic energy of 77.5 MeV/nucleon, and were collected with the LISE fragment separator at GANIL. The measured g factor (|g| in a range of 1.757±0.014) and quadrupole moment (|Q_s|=38(5) mb) are in good agreement with shell-model calculations using effective interactions. The similarity between the g factor of ^34mAl and that of ³²Al confirms a dominant neutron 2p1h configuration π(d_5/2)⁻¹⊗ν(d_3/2)⁻¹(f_7/2)² of ^34mAl. In addition, the enhanced quadrupole moment of ^34mAl relative to that of ³²Al suggests that the neutron 1p1h excitation across the N=20 shell gap introduces extra nucleon–nucleon correlation and deformation.

DOI： 10.1016/j.physletb.2018.06.009
Beta-gamma spectroscopy of the neutron-rich ¹⁵⁰Ba 査読

Progress of Theoretical and Experimental Physics 2018 ( 4 ) 2018年4月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1093/ptep/pty037
Identification of new neutron-rich isotopes in the rare-earth region produced by 345MeV/nucleon ²³⁸U 査読

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

journal of the physical society of japan 87 ( 1 ) 2018年1月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.7566/JPSJ.87.014202
Observation of new neutron-rich isotopes among fission fragments from in-flight fission of 345MeV/nucleon ²³⁸U Search for new isotopes conducted concurrently with Decay Measurement Campaigns 査読

journal of the physical society of japan 87 ( 1 ) 2018年1月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.7566/JPSJ.87.014203
Discovery of new isotopes Mo 81,82 and Ru 85,86 and a determination of the particle instability of 103 Sb 査読

H. Suzuki, T. Kubo, N. Fukuda, N. Inabe, D. Kameda, H. Takeda, K. Yoshida, K. Kusaka, Y. Yanagisawa, M. Ohtake, H. Sato, Y. Shimizu, H. Baba, M. Kurokawa, K. Tanaka, O. B. Tarasov, D. Bazin, D. J. Morrissey, B. M. Sherrill, K. Ieki, D. Murai, N. Iwasa, A. Chiba, Y. Ohkoda, E. Ideguchi, S. Go, R. Yokoyama, T. Fujii, D. Nishimura, H. Nishibata, S. Momota, M. Lewitowicz, G. Defrance, I. Celikovic, K. Steiger

Physical Review C 96 ( 3 ) 2017年9月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1103/PhysRevC.96.034604
Observation of a γ-decaying millisecond isomeric state in ¹²⁸Cd₈₀ 査読

A. Jungclaus, H. Grawe, S. Nishimura, P. Doornenbal, G. Lorusso, G. S. Simpson, P. A. Söderström, T. Sumikama, J. Taprogge, Z. Y. Xu, H. Baba, F. Browne, N. Fukuda, R. Gernhäuser, G. Gey, N. Inabe, T. Isobe, H. S. Jung, D. Kameda, G. D. Kim, Y. K. Kim, I. Kojouharov, T. Kubo, N. Kurz, Y. K. Kwon, Z. Li, H. Sakurai, H. Schaffner, Y. Shimizu, K. Steiger, H. Suzuki, H. Takeda, Zs Vajta, H. Watanabe, J. Wu, A. Yagi, K. Yoshinaga, G. Benzoni, S. Bönig, K. Y. Chae, L. Coraggio, J. M. Daugas, F. Drouet, A. Gadea, A. Gargano, S. Ilieva, N. Itaco, F. G. Kondev, T. Kröll, G. J. Lane, A. Montaner-Pizá, K. Moschner, D. Mücher, F. Naqvi, M. Niikura, H. Nishibata, A. Odahara, R. Orlandi, Z. Patel, Zs Podolyák, A. Wendt

772 483 - 488 2017年9月

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記述言語：英語掲載種別：研究論文（学術雑誌）

A new high-spin isomer in the neutron-rich nucleus ¹²⁸Cd was populated in the projectile fission of a ²³⁸U beam at the Radioactive Isotope Beam Factory at RIKEN. A half-life of T_1/2=6.3(8) ms was measured for the new state which was tentatively assigned a spin/parity of (15⁻). The experimental results are compared to shell model calculations performed using state-of-the-art realistic effective interactions and to the neighbouring nucleus ¹²⁹Cd. In the present experiment no evidence was found for the decay of a 18⁺ E6 spin-trap isomer, based on the complete alignment of the two-neutron and two-proton holes in the 0h_11/2 and the 0g_9/2 orbit, respectively, which is predicted to exist by the shell model.

DOI： 10.1016/j.physletb.2017.07.006
Isomer-delayed γ -ray spectroscopy of A=159-164 midshell nuclei and the variation of K -forbidden E1 transition hindrance factors 査読

Z. Patel, P. M. Walker, Zs Podolyák, P. H. Regan, T. A. Berry, P. A. Söderström, H. Watanabe, E. Ideguchi, G. S. Simpson, S. Nishimura, Q. Wu, F. R. Xu, F. Browne, P. Doornenbal, G. Lorusso, S. Rice, L. Sinclair, T. Sumikama, J. Wu, Z. Y. Xu, N. Aoi, H. Baba, F. L. Bello Garrote, G. Benzoni, R. Daido, Zs Dombrádi, Y. Fang, N. Fukuda, G. Gey, S. Go, A. Gottardo, N. Inabe, T. Isobe, D. Kameda, K. Kobayashi, M. Kobayashi, T. Komatsubara, I. Kojouharov, T. Kubo, N. Kurz, I. Kuti, Z. Li, M. Matsushita, S. Michimasa, C. B. Moon, H. Nishibata, I. Nishizuka, A. Odahara, Şahin E., H. Sakurai, H. Schaffner, H. Suzuki, H. Takeda, M. Tanaka, J. Taprogge, Zs Vajta, A. Yagi, R. Yokoyama

96 ( 3 ) 2017年9月

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記述言語：英語掲載種別：研究論文（学術雑誌）

Excited states have been studied in Sm159, Sm161, Sm162 (Z=62), Eu163 (Z=63), and Gd164 (Z=64), populated by isomeric decay following U238 projectile fission at RIBF, RIKEN. The isomer half-lives range from 50 ns to 2.6μs. In comparison with other published data, revised interpretations are proposed for Sm159 and Eu163. The first data for excited states in Sm161 are presented, where a 2.6-μs isomer is assigned a three-quasiparticle, Kπ=17/2- structure. The interpretation is supported by multi-quasiparticle Nilsson-BCS calculations, including the blocking of pairing correlations. A consistent set of reduced E1 hindrance factors is obtained. Limited evidence is also reported for isomeric decay in Sm163, Eu164, and Eu165.

DOI： 10.1103/PhysRevC.96.034305
β -decay scheme of Te 140 to i 140 Suppression of Gamow-Teller transitions between the neutron h9/2 and proton h11/2 partner orbitals 査読

B. Moon, C. B. Moon, A. Odahara, R. Lozeva, P. A. Söderström, F. Browne, C. Yuan, A. Yagi, B. Hong, H. S. Jung, P. Lee, C. S. Lee, S. Nishimura, P. Doornenbal, G. Lorusso, T. Sumikama, H. Watanabe, I. Kojouharov, T. Isobe, H. Baba, H. Sakurai, R. Daido, Y. Fang, H. Nishibata, Z. Patel, S. Rice, L. Sinclair, J. Wu, Z. Y. Xu, R. Yokoyama, T. Kubo, N. Inabe, H. Suzuki, N. Fukuda, D. Kameda, H. Takeda, D. S. Ahn, Y. Shimizu, D. Murai, F. L. Bello Garrote, J. M. Daugas, F. Didierjean, E. Ideguchi, T. Ishigaki, S. Morimoto, M. Niikura, I. Nishizuka, T. Komatsubara, Y. K. Kwon, K. Tshoo

96 ( 1 ) 2017年7月

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記述言語：英語掲載種別：研究論文（学術雑誌）

We report for the first time the β-decay scheme of Te140 (Z=52) to I140 (Z=53), with a specific focus on the Gamow-Teller strength along N=87 isotones. These results were obtained in an experiment performed at the Radioactive Ion Beam Factory (RIBF), RIKEN, where the parent nuclide, Te140, was produced through the in-flight fission of a U238 beam at 345 MeV per nucleon impinging on a Be9 target. Based on data from the high-efficiency γ-ray spectrometer, EUROBALL-RIKEN Cluster Array (EURICA), we constructed a decay scheme of I140. The half-life of Te140 has been determined to be 350(5) ms. A level at 926 keV has been assigned as a (1+) state based on the logft value of 4.89(6). This (1+) state, commonly observed in odd-odd nuclei, can be interpreted in terms of the πh11/2νh9/2 configuration formed by the Gamow-Teller transition between a neutron in the h9/2 orbital and a proton in the h11/2 orbital. We observe a sharp contrast to this type of β-decay branching to the lower-lying 1+ states between I140 and I136, where we see a large reduction as the number of neutrons increases. This is in contrast to the prediction by large-scale shell model calculations. To investigate this type of the suppression, results of the Nilsson model calculations will be discussed. Along the isotones with N=87, we discuss a characteristic feature of the Gamow-Teller distributions at 1+ states with respect to the isospin difference.

DOI： 10.1103/PhysRevC.96.014325
Shell Evolution towards Ni 78 Low-Lying States in Cu 77 査読

Physical Review Letters 118 ( 24 ) 2017年6月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1103/PhysRevLett.118.242502
Observation of new neutron-rich Mn, Fe, Co, Ni, and Cu isotopes in the vicinity of Ni 78 査読

Physical Review C 95 ( 5 ) 2017年5月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1103/PhysRevC.95.051601
The role of core excitations in the structure and decay of the 16⁺ spin-gap isomer in ⁹⁶Cd 査読

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 767 474 - 479 2017年4月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1016/j.physletb.2017.02.013
Nuclear structure and β -decay schemes for Te nuclides beyond N=82 査読

B. Moon, C. B. Moon, P. A. Söderström, A. Odahara, R. Lozeva, B. Hong, F. Browne, H. S. Jung, P. Lee, C. S. Lee, A. Yagi, C. Yuan, S. Nishimura, P. Doornenbal, G. Lorusso, T. Sumikama, H. Watanabe, I. Kojouharov, T. Isobe, H. Baba, H. Sakurai, R. Daido, Y. Fang, H. Nishibata, Z. Patel, S. Rice, L. Sinclair, J. Wu, Z. Y. Xu, R. Yokoyama, T. Kubo, N. Inabe, H. Suzuki, N. Fukuda, D. Kameda, H. Takeda, D. S. Ahn, Y. Shimizu, D. Murai, F. L. Bello Garrote, J. M. Daugas, F. Didierjean, E. Ideguchi, T. Ishigaki, S. Morimoto, M. Niikura, I. Nishizuka, T. Komatsubara, Y. K. Kwon, K. Tshoo

95 ( 4 ) 2017年4月

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記述言語：英語掲載種別：研究論文（学術雑誌）

We study for the first time the internal structure of Te140 through the β-delayed γ-ray spectroscopy of Sb140. The very neutron-rich Sb140 nuclei with Z=51 and N=89 were produced by the in-flight fission of U238 beams at the Radioactive Isotope Beam Factory, RIKEN. The half-life and spin-parity of Sb140 are reported as 173±12 ms and 3-, respectively. In addition to the excited states of Te140 produced by the β-decay branch, the β-delayed one-neutron and two-neutron emission branches were also established. By identifying the first 2+ and 4+ excited states of Te140, we found that Te isotopes persist in their vibrator character with E(4+)/E(2+)=2. We discuss the distinctive features manifest in this region revealed in pairs of isotopes with the same neutron holes and particles with respect to N=82.

DOI： 10.1103/PhysRevC.95.044322
New K isomers in the neutron-rich N=100 isotones Sm 162, Eu 163, and Gd 164 NEW K ISOMERS in the NEUTRON-RICH N=100 ... R. YOKOYAMA et al. 査読

R. Yokoyama, S. Go, D. Kameda, T. Kubo, N. Inabe, N. Fukuda, H. Takeda, H. Suzuki, K. Yoshida, K. Kusaka, K. Tanaka, Y. Yanagisawa, M. Ohtake, H. Sato, Y. Shimizu, H. Baba, M. Kurokawa, D. Nishimura, T. Ohnishi, N. Iwasa, A. Chiba, T. Yamada, E. Ideguchi, T. Fujii, H. Nishibata, K. Ieki, D. Murai, S. Momota, Y. Sato, J. W. Hwang, S. Kim, O. B. Tarasov, D. J. Morrissey, B. M. Sherrill, G. Simpson, C. R. Praharaj

Physical Review C 95 ( 3 ) 2017年3月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1103/PhysRevC.95.034313
94 β -Decay Half-Lives of Neutron-Rich Cs 55 to Ho 67 Experimental Feedback and Evaluation of the r -Process Rare-Earth Peak Formation 査読

J. Wu, S. Nishimura, G. Lorusso, P. Möller, E. Ideguchi, P. H. Regan, G. S. Simpson, P. A. Söderström, P. M. Walker, H. Watanabe, Z. Y. Xu, H. Baba, F. Browne, R. Daido, P. Doornenbal, Y. F. Fang, G. Gey, T. Isobe, P. S. Lee, J. J. Liu, Z. Li, Z. Korkulu, Z. Patel, V. Phong, S. Rice, H. Sakurai, L. Sinclair, T. Sumikama, M. Tanaka, A. Yagi, Y. L. Ye, R. Yokoyama, G. X. Zhang, T. Alharbi, N. Aoi, F. L. Bello Garrote, G. Benzoni, A. M. Bruce, R. J. Carroll, K. Y. Chae, Z. Dombradi, A. Estrade, A. Gottardo, C. J. Griffin, H. Kanaoka, I. Kojouharov, F. G. Kondev, S. Kubono, N. Kurz, I. Kuti, S. Lalkovski, G. J. Lane, E. J. Lee, T. Lokotko, G. Lotay, C. B. Moon, H. Nishibata, I. Nishizuka, C. R. Nita, A. Odahara, Zs Podolyák, O. J. Roberts, H. Schaffner, C. Shand, J. Taprogge, S. Terashima, Z. Vajta, S. Yoshida

118 ( 7 ) 2017年2月

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記述言語：英語掲載種別：研究論文（学術雑誌）

The β-decay half-lives of 94 neutron-rich nuclei Cs144-151, Ba146-154, La148-156, Ce150-158, Pr153-160, Nd156-162, Pm159-163, Sm160-166, Eu161-168, Gd165-170, Tb166-172, Dy169-173, Ho172-175, and two isomeric states Er174m, Dy172m were measured at the Radioactive Isotope Beam Factory, providing a new experimental basis to test theoretical models. Strikingly large drops of β-decay half-lives are observed at neutron-number N=97 for Ce58, Pr59, Nd60, and Sm62, and N=105 for Eu63, Gd64, Tb65, and Dy66. Features in the data mirror the interplay between pairing effects and microscopic structure. r-process network calculations performed for a range of mass models and astrophysical conditions show that the 57 half-lives measured for the first time play an important role in shaping the abundance pattern of rare-earth elements in the solar system.

DOI： 10.1103/PhysRevLett.118.072701
Erratum to Proton-hole and core-excited states in the semi-magic nucleus ¹³¹In₈₂ (Eur. Phys. J. A, (2016), 52, (347), 10.1140/epja/i2016-16347-y) 査読

European Physical Journal A 52 ( 12 ) 2016年12月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1140/epja/i2016-16375-7
μ s isomers of Nd 158,160 査読

E. Ideguchi, G. S. Simpson, R. Yokoyama, Mn Tanaka, S. Nishimura, P. Doornenbal, G. Lorusso, P. A. Söderström, T. Sumikama, J. Wu, Z. Y. Xu, N. Aoi, H. Baba, F. L. Bello Garrote, G. Benzoni, F. Browne, R. Daido, Y. Fang, N. Fukuda, A. Gottardo, G. Gey, S. Go, N. Inabe, T. Isobe, D. Kameda, K. Kobayashi, M. Kobayashi, I. Kojouharov, T. Komatsubara, T. Kubo, N. Kurz, I. Kuti, Z. Li, M. Matsushita, S. Michimasa, C. B. Moon, H. Nishibata, I. Nishizuka, A. Odahara, Z. Patel, S. Rice, E. Sahin, H. Sakurai, H. Schaffner, L. Sinclair, H. Suzuki, H. Takeda, J. Taprogge, Zs Vajta, H. Watanabe, A. Yagi

94 ( 6 ) 2016年12月

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記述言語：英語掲載種別：研究論文（学術雑誌）

The neutron-rich nuclei Nd158,160 have been studied via delayed γ-ray spectroscopy of μs isomeric states at the RIBF facility, RIKEN. These nuclei were produced following the projectile fission of a 345 AMeVU238 beam and delayed γ rays were detected by the EURICA cluster Ge array. The isomeric states have measured half-lives of 339(20) ns and 1.63(21) μs for Nd158 and Nd160, respectively. From the observed γ decays and the systematics of levels in the neighboring Nd isotopes first level schemes were constructed for these nuclei. The isomeric states of Nd158,160 have been assigned spins of (6-) and (4-), with proposed ν5/2[523]' - ν7/2[633] and ν1/2[521]' - ν7/2[633] configurations, respectively.

DOI： 10.1103/PhysRevC.94.064322
Proton-hole and core-excited states in the semi-magic nucleus ¹³¹In₈₂ 査読

European Physical Journal A 52 ( 11 ) 2016年11月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1140/epja/i2016-16347-y
β-decay spectroscopy of Neutron-rich ^160,161,162Sm isotopes 査読

Z. Patel, Zs Podolyák, P. M. Walker, P. H. Regan, P. A. Söderström, H. Watanabe, E. Ideguchi, G. S. Simpson, S. Nishimura, F. Browne, P. Doornenbal, G. Lorusso, S. Rice, L. Sinclair, T. Sumikama, J. Wu, Z. Y. Xu, N. Aoi, H. Baba, F. L.Bello Garrote, G. Benzoni, R. Daido, Zs Dombrádi, Y. Fang, N. Fukuda, G. Gey, S. Go, A. Gottardo, N. Inabe, T. Isobe, D. Kameda, K. Kobayashi, M. Kobayashi, T. Komatsubara, I. Kojouharov, T. Kubo, N. Kurz, I. Kuti, Z. Li, H. L. Liu, M. Matsushita, S. Michimasa, C. B. Moon, H. Nishibata, I. Nishizuka, A. Odahara, Şahin E., H. Sakurai, H. Schaffner, H. Suzuki, H. Takeda, M. Tanaka, J. Taprogge, Zs Vajta, F. R. Xu, A. Yagi, R. Yokoyama

123 2016年9月

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記述言語：英語掲載種別：研究論文（学術雑誌）

Neutron-rich ^160,161,162Sm isotopes have been populated at the RIBF, RIKEN via β decay for the first time. β-coincident γ rays were observed in all three isotopes including γ rays from the isomeric decay of ¹⁶⁰Sm and ¹⁶²Sm. The isomers in ¹⁶⁰Sm and ¹⁶²Sm have previously been observed but have been populated via β decay for the first time. The isomeric state in ¹⁶²Sm is assigned a 4^- ν7/2 ⁺[633]⊗ν1/2^-[521] configuration based on the decay pattern. The level schemes of ¹⁶⁰Sm and ¹⁶²Sm are presented. The ground states in the parent nuclei ¹⁶⁰Pm and ¹⁶²Pm are both assigned a 6^- ν7/2⁺[633] ⊗ π5/2 ^- [532] configuration based on the population of states in the daughter nuclei. Blocked BCS calculations were performed to further investigate the spin-parities of the ground states in ¹⁶⁰Pm, ¹⁶¹Pm, and ¹⁶²Pm, and the isomeric state in ¹⁶²Sm.

DOI： 10.1051/epjconf/201612302002
β decay of semi-magic Cd 130 Revision and extension of the level scheme of in 130 査読

A. Jungclaus, H. Grawe, S. Nishimura, P. Doornenbal, G. Lorusso, G. S. Simpson, P. A. Söderström, T. Sumikama, J. Taprogge, Z. Y. Xu, H. Baba, F. Browne, N. Fukuda, R. Gernhäuser, G. Gey, N. Inabe, T. Isobe, H. S. Jung, D. Kameda, G. D. Kim, Y. K. Kim, I. Kojouharov, T. Kubo, N. Kurz, Y. K. Kwon, Z. Li, H. Sakurai, H. Schaffner, Y. Shimizu, K. Steiger, H. Suzuki, H. Takeda, Zs Vajta, H. Watanabe, J. Wu, A. Yagi, K. Yoshinaga, G. Benzoni, S. Bönig, K. Y. Chae, L. Coraggio, J. M. Daugas, F. Drouet, A. Gadea, A. Gargano, S. Ilieva, N. Itaco, F. G. Kondev, T. Kröll, G. J. Lane, A. Montaner-Pizá, K. Moschner, D. Mücher, F. Naqvi, M. Niikura, H. Nishibata, A. Odahara, R. Orlandi, Z. Patel, Zs Podolyák, A. Wendt

94 ( 2 ) 2016年8月

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記述言語：英語掲載種別：研究論文（学術雑誌）

The β decay of the semi-magic nucleus Cd130 has been studied at the RIBF facility at the RIKEN Nishina Center. The high statistics of the present experiment allowed for a revision of the established level scheme of In130 and the observation of additional β feeding to high-lying core-excited states in In130. The experimental results are compared to shell-model calculations employing a model space consisting of the full major N=50-82 neutron and Z=28-50 proton shells and the NA-14 interaction, and good agreement is found.

DOI： 10.1103/PhysRevC.94.024303
Large-scale shell model study of the newly found isomer in la 136 査読

E. Teruya, N. Yoshinaga, K. Higashiyama, H. Nishibata, A. Odahara, T. Shimoda

Physical Review C 94 ( 1 ) 2016年7月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1103/PhysRevC.94.014317
Magnetic moment of the 13/2+ isomeric state in Cu 69 Spin alignment in the one-nucleon removal reaction 査読

A. Kusoglu, G. Georgiev, C. Sotty, D. L. Balabanski, A. Goasduff, Y. Ishii, Y. Abe, K. Asahi, M. Bostan, R. Chevrier, M. Chikamori, J. M. Daugas, T. Furukawa, H. Nishibata, Y. Ichikawa, Y. Ishibashi, R. Lozeva, H. Miyatake, D. Nagae, T. Nanao, M. Niikura, T. Niwa, S. Okada, A. Ozawa, Y. Saito, H. Shirai, H. Ueno, D. T. Yordanov, N. Yoshida

Physical Review C 93 ( 5 ) 2016年5月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1103/PhysRevC.93.054313
First observation of γ rays emitted from excited states south-east of Sn 132 The π g9/2-1 - νf7/2 multiplet of In83 132 査読

A. Jungclaus, A. Gargano, H. Grawe, J. Taprogge, S. Nishimura, P. Doornenbal, G. Lorusso, Y. Shimizu, G. S. Simpson, P. A. Söderström, T. Sumikama, Z. Y. Xu, H. Baba, F. Browne, N. Fukuda, R. Gernhäuser, G. Gey, N. Inabe, T. Isobe, H. S. Jung, D. Kameda, G. D. Kim, Y. K. Kim, I. Kojouharov, T. Kubo, N. Kurz, Y. K. Kwon, Z. Li, H. Sakurai, H. Schaffner, K. Steiger, H. Suzuki, H. Takeda, Zs Vajta, H. Watanabe, J. Wu, A. Yagi, K. Yoshinaga, S. Bönig, L. Coraggio, J. M. Daugas, F. Drouet, A. Gadea, S. Ilieva, N. Itaco, T. Kröll, A. Montaner-Pizá, K. Moschner, D. Mücher, H. Nishibata, A. Odahara, R. Orlandi, A. Wendt

93 ( 4 ) 2016年4月

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記述言語：英語掲載種別：研究論文（学術雑誌）

For the first time, the γ decay of excited states has been observed in a nucleus situated in the quadrant south-east of doubly magic Sn132, a region in which experimental information so far is limited to ground-state properties. Six γ rays with energies of 50, 86, 103, 227, 357, and 602 keV were observed following the β-delayed neutron emission from Cd85133, populated in the projectile fission of a U238 beam at the Radioactive Isotope Beam Factory at RIKEN within the EURICA project. The new experimental information is compared to the results of a modern realistic shell-model calculation, the first one in this region very far from stability, focusing in particular on the π0g9/2-1 - ν1f7/2 particle-hole multiplet in In83132. In addition, theoretical estimates based on a scaling of the two-body matrix elements for the πh11/2-1 - νg9/2 analog multiplet in Tl127208, one major proton and one major neutron shell above, are presented.

DOI： 10.1103/PhysRevC.93.041301
First results on the excited states in ⁷⁷Cu 査読

Acta Physica Polonica B 47 ( 3 ) 889 - 895 2016年3月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.5506/APhysPolB.47.889
Decay spectroscopy of ¹⁶⁰Sm The lightest four-quasiparticle K isomer 査読

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 753 182 - 186 2016年2月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1016/j.physletb.2015.12.026
β-decay half-lives of neutron-rich nuclei around ¹⁵⁸Nd, relevant to the formation of the A≈165 rare-earth element peak 査読

, J. Wu, S. Nishimura, G. Lorusso, Z. Y. Xu, E. Ideguchi, G. S. Simpson, H. Baba, F. Browne, R. Daido, P. Doornebal, Y. F. Fang, T. Isobe, Z. Li, Z. Patel, S. Rice, L. Sinclair, P. A. Söderström, T. Sumikama, H. Watanabe, A. Yagi, R. Yokoyama, N. Aoi, F. L.Bello Garrote, G. Benzoni, G. Gey, A. Gottardo, H. Nishibata, A. Odahara, H. Sakurai, M. Tanaka, J. Taprogge, T. Yamamoto

109 2016年2月

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記述言語：英語掲載種別：研究論文（学術雑誌）

A β-decay spectroscopy experiment around ¹⁵⁸Nd was performed at RI Beam Factory (RIBF), RIKEN Nishina Center, in order to understand the production mechanism of the A≈165 rare-earth element (REE) peak in the r-process mass abundance pattern. In this experiment, 53 half-lives are measured including 34 new results, which could be employed in a fully dynamic r-process network calculation.

DOI： 10.1051/epjconf/201610908003
New isomer found in Sb89 51140 Sphericity and shell evolution between N=82 and N=90 査読

Physical Review C 93 ( 1 ) 2016年1月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1103/PhysRevC.93.014316
Role of hexadecupole deformation in the shape evolution of neutron-rich Nd isotopes 査読

26th International Nuclear Physics Conference, INPC 2016 Proceedings of Science 2016-September 2016年1月

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記述言語：英語掲載種別：研究論文（学術雑誌）
Two-hole structure outside Ni 78 Existence of a μ s isomer of Co 76 and β decay into Ni 76 査読

P. A. Söderström, S. Nishimura, Z. Y. Xu, K. Sieja, V. Werner, P. Doornenbal, G. Lorusso, F. Browne, G. Gey, H. S. Jung, T. Sumikama, J. Taprogge, Zs Vajta, H. Watanabe, J. Wu, H. Baba, Zs Dombradi, S. Franchoo, T. Isobe, P. R. John, Y. K. Kim, I. Kojouharov, N. Kurz, Y. K. Kwon, Z. Li, I. Matea, K. Matsui, G. Martínez-Pinedo, D. Mengoni, P. Morfouace, D. R. Napoli, M. Niikura, H. Nishibata, A. Odahara, K. Ogawa, N. Pietralla, Şahin E., H. Sakurai, H. Schaffner, D. Sohler, I. G. Stefan, D. Suzuki, R. Taniuchi, A. Yagi, K. Yoshinaga

92 ( 5 ) 2015年11月

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記述言語：英語掲載種別：研究論文（学術雑誌）

In the EURICA campaign aimed at exploration of the Ni78 region, an isomeric state of Co76 has been observed via γ-ray spectroscopy. The nuclei were produced by in-flight fission of a U238 beam at the Radioactive Isotope-Beam Factory. Two coincident γ rays of 192.02(30) and 446.4(7) keV from the decay of a t1/2=2.96(2529)μs isomeric state of Co76 have been observed. The decay of the isomer was assigned to an E1 transition with a reduced transition probability of B(E1;3+→2-)=1.79(16)×10-8 W.u. A β-decaying state with spin-parity 1- and a half-life of 16(4) ms was also observed in the data, and the known state with a half-life of 22(57) ms was assigned to have a spin-parity of 8-. Furthermore, the isomer of Ni76 has been remeasured to 547.8(33) ns giving a B(E2;8+→6+) value of 0.786(5) W.u. A new excited state at 2994.6(5) keV, decaying via a γ ray of 2004.5(4) keV, has also been observed. This is in agreement with either of the predicted 02+ or 22+ states. These results are discussed in terms of the shell model and the interaction of the νp1/2 and πf7/2 orbitals.

DOI： 10.1103/PhysRevC.92.051305
Lifetime measurements of the first 2⁺ states in ^104,106Zr Evolution of ground-state deformations 査読

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 750 448 - 452 2015年11月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1016/j.physletb.2015.09.043
β -delayed γ -ray spectroscopy of non-yrast states in Te 138 near the neutron drip line 査読

P. Lee, C. B. Moon, C. S. Lee, A. Odahara, R. Lozeva, A. Yagi, S. Nishimura, P. Doornenbal, G. Lorusso, P. A. Söderström, T. Sumikama, H. Watanabe, T. Isobe, H. Baba, H. Sakurai, F. Browne, R. Daido, Y. Fang, H. Nishibata, Z. Patel, S. Rice, L. Sinclair, J. Wu, Z. Y. Xu, R. Yokoyama, T. Kubo, N. Inabe, H. Suzuki, N. Fukuda, D. Kameda, H. Takeda, D. S. Ahn, D. Murai, F. L. Bello Garrote, J. M. Daugas, F. Didierjean, E. Ideguchi, T. Ishigaki, H. S. Jung, T. Komatsubara, Y. K. Kwon, S. Morimoto, M. Niikura, I. Nishizuka, K. Tshoo

92 ( 4 ) 2015年10月

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記述言語：英語掲載種別：研究論文（学術雑誌）

We report on the first β-decay data of Sb138 to Te138 isotopes beyond the doubly magic Sn132. The parent nucleus was produced by the in-flight fission of a U238 beam on a Be9 target at 345 MeV per nucleon and measured at the BigRIPS separator of the Radioactive Isotope Beam Factory at RIKEN. By using advanced β-γ spectroscopy techniques, the half-life and the tentative spin-parity of Sb138 were measured to be 346(19) ms and (3-), respectively. In addition, we observed several low-lying non-yrast states in Te138 for the first time. Our data allowed us to rearrange the positions of the first 2+ and 4+ states in this nucleus and to construct the level scheme of Te138 in accordance with shell-model calculations. Additionally, we extend energy systematics of Te isotopes within neutron numbers 54 and 86.

DOI： 10.1103/PhysRevC.92.044320
Pathway for the production of neutron-rich isotopes around the N=126 shell closure 査読

Y. X. Watanabe, Y. H. Kim, S. C. Jeong, Y. Hirayama, N. Imai, H. Ishiyama, H. S. Jung, H. Miyatake, S. Choi, J. S. Song, E. Clement, G. De France, A. Navin, M. Rejmund, C. Schmitt, G. Pollarolo, L. Corradi, E. Fioretto, D. Montanari, M. Niikura, D. Suzuki, H. Nishibata, J. Takatsu

Physical Review Letters 115 ( 17 ) 2015年10月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1103/PhysRevLett.115.172503
New decay scheme of the Sb85 51136 6- Isomer 査読

Physical Review C - Nuclear Physics 92 ( 2 ) 2015年8月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1103/PhysRevC.92.024304
Study of ground and excited state decays in N ≈ Z Ag nuclei

K. Moschner, A. Blazhev, N. Warr, P. Boutachkov, P. Davies, R. Wadsworth, F. Ameil, H. Baba, T. Bäck, M. Dewald, P. Doornenbal, T. Faestermann, A. Gengelbach, J. Gerl, R. Gernhäuser, S. Go, M. Górska, H. Grawe, E. Gregor, H. Hotaka, T. Isobe, D. G. Jenkins, J. Jolie, H. S. Jung, I. Kojouharov, N. Kurz, M. Lewitowicz, G. Lorusso, E. Merchan, F. Naqvi, H. Nishibata, D. Nishimura, S. Nishimura, N. Pietralla, H. Schaffner, P. A. Söderström, K. Steiger, T. Sumikama, J. Taprogge, P. Thöle, H. Watanabe, V. Werner, Z. Y. Xu, A. Yagi, K. Yoshinaga, Y. Zhu

2015年5月

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記述言語：英語掲載種別：研究論文（その他学術会議資料等）

A decay spectroscopy experiment was performed within the EURICA campaign at RIKEN in 2012. It aimed at the isomer and particle spectroscopy of excited states and ground states in the mass region below the doubly magic ¹⁰⁰Sn. The N = Z nuclei ⁹⁸In, ⁹⁶Cd and ⁹⁴Ag were of particular interest for the present study. Preliminary results on the neutron deficient nuclei ⁹³Ag and ⁹⁴Ag are presented. In ⁹⁴Ag a more precise value for the half-life of the ground state's superallowed Fermi transition was deduced. In addition the energy spectra of the mentioned decay could be reproduced through precise Geant4 simulations of the used active stopper SIMBA. This will enable us to extract Q_β values from the measured data. The decay of ⁹³Ag is discussed based on the observed implantation-decay correlation events. Owned by the authors, published by EDP Sciences, 2015.

DOI： 10.1051/epjconf/20159301024
β-Decay Half-Lives of 110 Neutron-Rich Nuclei across the N = 82 Shell Gap Implications for the Mechanism and Universality of the Astrophysical r Process 査読

G. Lorusso, S. Nishimura, Z. Y. Xu, A. Jungclaus, Y. Shimizu, G. S. Simpson, P. A. Söderström, H. Watanabe, F. Browne, P. Doornenbal, G. Gey, H. S. Jung, B. Meyer, T. Sumikama, J. Taprogge, Zs Vajta, J. Wu, H. Baba, G. Benzoni, K. Y. Chae, F. C.L. Crespi, N. Fukuda, R. Gernhäuser, N. Inabe, T. Isobe, T. Kajino, D. Kameda, G. D. Kim, Y. K. Kim, I. Kojouharov, F. G. Kondev, T. Kubo, N. Kurz, Y. K. Kwon, G. J. Lane, Z. Li, A. Montaner-Pizá, K. Moschner, F. Naqvi, M. Niikura, H. Nishibata, A. Odahara, R. Orlandi, Z. Patel, Zs Podolyák, H. Sakurai, H. Schaffner, P. Schury, S. Shibagaki, K. Steiger, H. Suzuki, H. Takeda, A. Wendt, A. Yagi, K. Yoshinaga

114 ( 19 ) 2015年5月

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記述言語：英語掲載種別：研究論文（学術雑誌）

The β-decay half-lives of 110 neutron-rich isotopes of the elements from ₃₇Rb to ₅₀Sn were measured at the Radioactive Isotope Beam Factory. The 40 new half-lives follow robust systematics and highlight the persistence of shell effects. The new data have direct implications for r-process calculations and reinforce the notion that the second (A ≈ 130) and the rare-earth-element (A ≈ 160) abundance peaks may result from the freeze-out of an (n, γ) ⇄ (γ,n) equilibrium. In such an equilibrium, the new half-lives are important factors determining the abundance of rare-earth elements, and allow for a more reliable discussion of the r process universality. It is anticipated that universality may not extend to the elements Sn, Sb, I, and Cs, making the detection of these elements in metal-poor stars of the utmost importance to determine the exact conditions of individual r-process events.

DOI： 10.1103/PhysRevLett.114.192501
β decay of Cd¹²⁹ and excited states in In¹²⁹ 査読

J. Taprogge, A. Jungclaus, H. Grawe, S. Nishimura, P. Doornenbal, G. Lorusso, G. S. Simpson, P. A. Söderström, T. Sumikama, Z. Y. Xu, H. Baba, F. Browne, N. Fukuda, R. Gernhäuser, G. Gey, N. Inabe, T. Isobe, H. S. Jung, D. Kameda, G. D. Kim, Y. K. Kim, I. Kojouharov, T. Kubo, N. Kurz, Y. K. Kwon, Z. Li, H. Sakurai, H. Schaffner, K. Steiger, H. Suzuki, H. Takeda, Zs Vajta, H. Watanabe, J. Wu, A. Yagi, K. Yoshinaga, G. Benzoni, S. Bönig, K. Y. Chae, L. Coraggio, A. Covello, J. M. Daugas, F. Drouet, A. Gadea, A. Gargano, S. Ilieva, F. G. Kondev, T. Kröll, G. J. Lane, A. Montaner-Pizá, K. Moschner, D. Mücher, F. Naqvi, M. Niikura, H. Nishibata, A. Odahara, R. Orlandi, Z. Patel, Zs Podolyák, A. Wendt

91 ( 5 ) 2015年5月

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記述言語：英語掲載種別：研究論文（学術雑誌）

The β decay of Cd¹²⁹, produced in the relativistic fission of a U²³⁸ beam, was experimentally studied at the RIBF facility at the RIKEN Nishina Center. From the γ radiation emitted after the β decays, a level scheme of In¹²⁹ was established comprising 31 excited states and 69 γ-ray transitions. The experimentally determined level energies are compared to state-of-the-art shell-model calculations. The half-lives of the two β-decaying states in Cd¹²⁹ were deduced and the β feeding to excited states in In¹²⁹ were analyzed. It is found that, as in most cases in the Z<50, N≤82 region, both decays are dominated by the ν0g_7/2→π0g_9/2 Gamow-Teller transition, although the contribution of first-forbidden transitions cannot be neglected.

DOI： 10.1103/PhysRevC.91.054324
Gamma-ray spectroscopy in the vicinity of ¹⁰⁸zr 査読

Acta Physica Polonica B 46 ( 3 ) 721 - 724 2015年3月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.5506/APhysPolB.46.721
Isomer decay spectroscopy of Sm 164 and Gd 166 Midshell collectivity around N=100 査読

Physical Review Letters 113 ( 26 ) 2014年12月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1103/PhysRevLett.113.262502
Identification of a millisecond isomeric state in Cd81129 via the detection of internal conversion and Compton electrons 査読

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 738 223 - 227 2014年11月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1016/j.physletb.2014.09.047
Yrast 6 + seniority isomers of 136,138 Sn 査読

Physical Review Letters 113 ( 3 ) 2014年9月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1103/PhysRevLett.113.132502
Decay half-lives of Co 76,77, Ni 79,80, and Cu 81 Experimental indication of a doubly magic Ni 78 査読

Physical Review Letters 113 ( 3 ) 2014年7月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1103/PhysRevLett.113.032505
Monopole-driven shell evolution below the doubly magic nucleus Sn 132 explored with the long-lived isomer in Pd 126 査読

Physical Review Letters 113 ( 4 ) 2014年7月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1103/PhysRevLett.113.042502
Erratum 1p3 /2 proton-hole state in Sn 132 and the shell structure along N=82 (Physical Review Letters (2014) 112 (132501)) 査読

Physical Review Letters 113 ( 4 ) 2014年7月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1103/PhysRevLett.113.049902
1p3/2 proton-hole state in Sn 132 and the shell structure along N=82 査読

Physical Review Letters 112 ( 13 ) 2014年4月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1103/PhysRevLett.112.132501
Study of the multi-nucleon transfer reactions of ¹³⁶Xe + ¹⁹⁸Pt for producing exotic heavy nuclei 査読

Y. H. Kim, Y. X. Watanabe, Y. Hirayama, N. Imai, H. Ishiyama, S. C. Jeong, H. Miyatake, S. Choi, J. Song, E. Clement, G. De France, A. Navin, M. Rejmund, C. Schmitt, G. Pollarolo, L. Corradi, E. Fioretto, D. Montanari, M. Niikura, D. Suzuki, H. Nishibata, J. Takatsu

2013 International Nuclear Physics Conference, INPC 2013 EPJ Web of Conferences 66 2014年4月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1051/epjconf/20146603044
Isomer and beta decay spectroscopy in the ¹³²Sn region with EURICA 査読

2013 International Nuclear Physics Conference, INPC 2013 EPJ Web of Conferences 66 2014年4月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1051/epjconf/20146602040
β-decay of neutron-rich nuclei with Z ∼ 60 The origin of rare-earth elements 査読

, J. Wu, S. Nishimura, G. Lorusso, Z. Y. Xu, E. Ideguchi, G. Simpson, H. Baba, F. Browne, R. Daido, P. Doornenbal, Y. F. Fang, T. Isobe, Z. Li, Z. Patel, S. Rice, L. Sinclair, P. A. Söderström, T. Sumikama, H. Watanabe, A. Yagi, R. Yokoyama, N. Aoi, F. L. Bello Garrote, G. Benzoni, G. Gey, A. Gottardo, H. Nishibata, A. Odahara, H. Sakurai, M. Tanaka, J. Taprogge

07-11-July-2015 2014年1月

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記述言語：英語掲載種別：研究論文（学術雑誌）

A large fraction of the rare-earth elements around A = 160 observed in the solar system are produced in the astrophysical rapid (r-) neutron-capture process. However, current stellar models cannot completely explain the relative abundance of these elements partially because of nuclear physics uncertainties. To address this problem, a β-decay spectroscopy experiment was performed at RI Beam Factory (RIKEN), aimed at studying a wide range of very neutron-rich nuclei with Z ∼ 60. This experiment provides a test of nuclear models as well as experimental inputs for r-process calculations.
Nuclear structure explored by β-delayed decay spectroscopy of spin-polarized radioactive nuclei at TRIUMF ISAC-1 Intruder configurations in ²⁹Mg and ³⁰Mg, the nuclei in the region of island of inversion 査読

225 ( 1-3 ) 183 - 191 2014年1月

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記述言語：英語掲載種別：研究論文（学術雑誌）

Spin-polarized radioactive nuclear beams at TRIUMF enable a new spectroscopic method which efficiently assigns spins and parities of the daughter levels by taking advantage of the asymmetric β-decay of the polarized parent nucleus. This method was successfully applied to structure studies of ²⁹Mg and ³⁰Mg in connection with the physics of the "island of inversion". In ²⁹Mg, two low-lying levels with intruder configuration were assigned. In ³⁰Mg, coexistence of spherical shape, prolate shape and γ-collectivity was strongly suggested.

DOI： 10.1007/s10751-013-0895-5
Nuclear structure explored by β-delayed decay spectroscopy of spin-polarized radioactive nuclei at TRIUMF ISAC-1 Intruder configurations in ²⁹Mg and ³⁰Mg, the nuclei in the region of island of inversion

183 - 192 2014年1月

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記述言語：英語

Spin-polarized radioactive nuclear beams at TRIUMF enable a new spectroscopic method which efficiently assigns spins and parities of the daughter levels by taking advantage of the asymmetric β-decay of the polarized parent nucleus. This method was successfully applied to structure studies of ²⁹Mg and ³⁰Mg in connection with the physics of the “island of inversion”. In ²⁹Mg, two low-lying levels with intruder configuration were assigned. In ³⁰Mg, coexistence of spherical shape, prolate shape and γ-collectivity was strongly suggested.

DOI： 10.1007/978-94-007-7963-1_20
Beta decay and isomer spectroscopy in the ¹³²Sn region New results from EURICA 査読

20th International School on Nuclear Physics, Neutron Physics and Applications, Varna 2013 Journal of Physics: Conference Series 533 ( 1 ) 2014年1月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1088/1742-6596/533/1/012045
β-decay spectroscopy at RIBF The EURICA project

G. Lorusso, S. Nishimura, H. Baba, F. Browne, R. Daido, P. Doornenbal, F. Yifan, G. Gey, T. Isobe, H. S. Jung, Z. Li, D. Lubos, K. Moschner, H. Nishibata, Z. Patel, S. Rice, L. Sinclair, P. A. Söderström, T. Sumikama, J. Taprogge, Zs Vajta, Z. Y. Xu, H. Watanabe, J. Wu, A. Yagi, K. Yoshinaga

370 - 379 2014年1月

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記述言語：英語掲載種別：研究論文（その他学術会議資料等）

EURICA is a project at the RIKEN Nishina Center aimed at studying a wide range of exotic nuclei through β-decay measurements and high-resolution γ-ray spectroscopy. During its first two years of operation, about 80 days of beam time have been dedicated to the project allowing the exploration of several very exotic regions of the nuclear chart, which include key nuclei such as 78Ni, 100Sn, 110Zr, 128Pd, and 138Sn. Data analysis of the EURICA experiments is currently ongoing.

DOI： 10.1063/1.4874097
β-decay of neutron-rich Z∼60 nuclei and the origin of rare earth elements

J. Wu, S. Nishimura, G. Lorusso, Z. Y. Xu, H. Baba, F. Browne, R. Daido, P. Doornenbal, Y. F. Fang, E. Ideguchi, T. Isobe, Z. Li, Z. Patel, S. Rice, G. Simpson, L. Sinclair, P. A. Söderström, T. Sumikama, H. Watanabe, A. Yagi, R. Yokoyama, N. Aoi, F. L.Bello Garrote, G. Benzoni, G. Gey, A. Gottardo, H. Nishibata, A. Odahara, H. Sakurai, M. Tanaka, J. Taprogge, T. Yamamoto

388 - 393 2014年1月

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記述言語：英語掲載種別：研究論文（その他学術会議資料等）

A large fraction of the rare-earth elements observed in the solar system is produced in the astrophysical rapid neutron capture process (r-process). However, current stellar models cannot completely explain the relative abundance of these elements partially because of nuclear physics uncertainties. To address this problem, a β-decay spectroscopy experiment was performed at RI Beam Factory (RIBF) at RIKEN, aimed at studying a wide range of very neutron-rich nuclei with Z∼60 that are progenitors of the rare-earth elements with mass number A∼460. The experiment provides a test of nuclear models as well as experimental inputs for r-process calculations. This contribution presents the experimental setup and some preliminary results of the experiment.

DOI： 10.1063/1.4874099
Installation and commissioning of EURICA - Euroball-RIKEN Cluster Array 査読

Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms 317 ( PART B ) 649 - 652 2013年12月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1016/j.nimb.2013.03.018
Study of collisions of ¹³⁶Xe + ¹⁹⁸Pt for the KEK isotope separator 査読

Y. X. Watanabe, Y. Hirayama, N. Imai, H. Ishiyama, S. C. Jeong, H. Miyatake, E. Clement, G. De France, A. Navin, M. Rejmund, C. Schmitt, G. Pollarolo, L. Corradi, E. Fioretto, D. Montanari, S. H. Choi, Y. H. Kim, J. S. Song, M. Niikura, D. Suzuki, H. Nishibata, J. Takatsu

Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms 317 ( PART B ) 752 - 755 2013年12月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1016/j.nimb.2013.04.036
Production cross section measurements of radioactive isotopes by BigRIPS separator at RIKEN RI Beam Factory 査読

H. Suzuki, T. Kubo, N. Fukuda, N. Inabe, D. Kameda, H. Takeda, K. Yoshida, K. Kusaka, Y. Yanagisawa, M. Ohtake, H. Sato, Y. Shimizu, H. Baba, M. Kurokawa, T. Ohnishi, K. Tanaka, O. B. Tarasov, D. Bazin, D. J. Morrissey, B. M. Sherrill, K. Ieki, D. Murai, N. Iwasa, A. Chiba, Y. Ohkoda, E. Ideguchi, S. Go, R. Yokoyama, T. Fujii, D. Nishimura, H. Nishibata, S. Momota, M. Lewitowicz, G. Defrance, I. Celikovic, K. Steiger

Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms 317 ( PART B ) 756 - 768 2013年12月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1016/j.nimb.2013.08.049
Isomers in Pd128 and Pd126 Evidence for a Robust Shell Closure at the Neutron Magic Number 82 in Exotic Palladium Isotopes 査読

Physical Review Letters 111 ( 15 ) 2013年10月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1103/PhysRevLett.111.152501
Spectroscopy of 135La 査読

R. Leguillon, H. Nishibata, Y. Ito, C. M. Petrache, A. Odahara, T. Shimoda, N. Hamatani, K. Tajiri, J. Takatsu, R. Yokoyama, E. Ideguchi, H. Watanabe, Y. Wakabayashi, K. Yoshinaga, T. Suzuki, S. Nishimura, D. Beaumel, G. Lehaut, D. Guinet, P. Desesquelles, D. Curien, A. Astier, T. Konstantinopoulos, T. Zerrouki

Physical Review C - Nuclear Physics 88 ( 4 ) 2013年10月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1103/PhysRevC.88.044309
Shape evolution in 116^,118Ru Triaxiality and transition between the O(6) and U(5) dynamical symmetries 査読

Physical Review C - Nuclear Physics 88 ( 2 ) 2013年8月

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1103/PhysRevC.88.024301
Structure of mg isotope studied by β-decay spectroscopy of spin-polarized na isotopes Shape coexistence in 30mg 査読

( 196 ) 310 - 315 2012年11月

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記述言語：英語掲載種別：研究論文（学術雑誌）

We have been studying the structure of Mg isotopes in the region of the N = 20 island of inversion, to clarify the structure change as a function of the neutron number. The experiments are being performed by our unique method of β-decay spectroscopy taking advantage of highly-spin-polarized radioactive nuclear beams at TRIUMF. The β-decay asymmetry in the Na-isotope decay enables unambiguous spin-parity assignments of the levels in the daughter Mg isotope, and it becomes possible to compare the experimental data and theoretical predictions on a level-by-level basis. The present paper reports on the results of the β decay of 30Na→30Mg. From the detailed decay scheme of 30Na, it is suggested that the 30Mg levels at 1.788 MeV [(0+2 )], 3.460 MeV [(2)+], 4.967 MeV [1+], and 5.414 MeV [2+] have deformed shapes with intruder configurations, whereas the level at 2.466 MeV [(2+2 )] has different nature both from the spherical ground state and the deformed four levels. It is proposed that the 2+2 level is the band-head of the predicted γ-band.

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講演・口頭発表等

Level scheme of ³³Al by β-decay spectroscopy of ³³Mg 国際会議

2024年4月

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開催年月日： 2024年4月

記述言語：英語

開催地：Osaka University 国名：日本国
Spin-polarized β-γ spectroscopy exploring shape coexistence in neutron-rich nuclei 招待国際会議

2024年4月

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開催年月日： 2024年3月

記述言語：英語会議種別：口頭発表（一般）

開催地：Osaka University 国名：日本国
ベータ遅延中性子測定のための中性子検出器の開発と性能評価

#岸本侃己、@西畑洸希、小田原厚子、#篠原悠介、#横田望海、#大上能弘 NurHafiza Mohamad Nor、下田正、@市川雄一、@若狭智嗣、北川淳志、佐藤眞二

日本物理学会九州支部例会 2022年12月

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開催年月日： 2023年6月

記述言語：日本語会議種別：口頭発表（一般）

開催地：熊本大学国名：日本国
Shape coexistence in ³⁰Mg and ³¹Mg explored by β-γspectroscopy with spin-polarized beams 招待国際会議

2023年5月

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開催年月日： 2023年5月

記述言語：英語会議種別：口頭発表（一般）

開催地：University of Guelph 国名：日本国
スピン整列不安定原子核を用いたベータ核磁気共鳴法の開発

@西畑洸希, Gladkov Aleksey, 上野秀樹, @市川雄一, 高峰愛子, 山崎展樹, 佐藤智哉, 田島美典, 今村彗, 川田敬太, 竹内由衣花, 螺良健一, 田中聡, 土居三瑠, 伊藤愛美, 秋元彩, 西村昌輝, 旭耕一郎, 三原基嗣, #足立智輝, #河本彩帆, 北川敦志, 佐藤眞二

日本物理学会 2022年3月

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開催年月日： 2022年3月

記述言語：日本語会議種別：口頭発表（一般）

開催地：オンライン国名：日本国
33Mgのβ遅発中性子崩壊による中性子過剰核33Alの中性子非束縛状態の研究

大上能弘、小田原厚子、西畑洸希、下田正、大谷優里花、前島大樹、金谷晋之介、飯村俊、吉岡篤志、浜野勇哉、関口直太、浅川寛太、C.D.P. Levy、M.R. Pearson、J. Lassen、R. Li

日本物理学会 2021年3月

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開催年月日： 2021年3月

記述言語：日本語会議種別：口頭発表（一般）

開催地：オンライン国名：日本国
スピン偏極31Mgビームを用いた31Al核の構造研究

前島大樹, 小田原厚子, 西畑洸希A, 下田正, 大上能弘, 飯村俊, 金谷晋之介, 大谷優里花, 浜野勇哉, 関口直太, 浅川寛太, C.D.P Levy, M.R.Pearson, J.Lassen, R.Li

日本物理学会 2021年3月

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開催年月日： 2021年3月

記述言語：日本語会議種別：口頭発表（一般）

開催地：オンライン国名：日本国
スピン偏極Mgのベータ崩壊を用いた中性子過剰なAl同位体の構造研究

西畑洸希, 浜野友哉, 小田原厚子, 下田正, 前島大樹, 大上能弘, 大谷優里花, 金谷晋之介, 飯村俊, 関口直太, 浅川寛太, 畠山温, 平山賀一, 若狭智嗣, C.D.P Levy, M.R. Pearson, J. Lassen, R. Li

日本物理学会 2020年3月

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開催年月日： 2020年3月

記述言語：日本語会議種別：口頭発表（一般）

開催地：名古屋大学国名：日本国
Structure of neutron-rich Al investigated by spin-polarized Mg 国際会議

the International symposium on Clustering as a Window on the Hierarchical Structure of Quantum Systems (CLUSHIQ2020) 2020年4月

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開催年月日： 2020年1月

記述言語：英語会議種別：口頭発表（一般）

国名：日本国
不安定核ビーム入射核融合反応を用いた N=80 の安定核付近の高スピン状態の研究

西畑洸希，伊藤洋介， R. Leguillon， C. Petrache，高津淳，田尻邦彦，濱谷紀彰，横山輪, 小田原厚子，下田正，井手口栄治，渡邉寛，若林泰生，吉永健太，鈴木智和，西村俊二， D. Beaumel, G. Lehaut, P. Desesquelles

日本物理学会 2011年9月

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開催年月日： 2020年1月

記述言語：日本語

国名：日本国
中性子数 80 の安定核領域における高スピン状態の研究

西畑洸希, 小田原厚子, 下田正, C. Petrache, R. Leguillon, 高津淳, 濵谷紀彰, 横山輪, 田尻邦彦, 伊藤洋介, 井手口栄治, 渡邉寛, 若林泰生, 吉永健太, 鈴木智和, 西村俊二, D. Beaumel, G. Lehaut, P. Desesquelles

日本物理学会 2012年9月

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開催年月日： 2020年1月

記述言語：日本語

国名：日本国
偏極不安定核 ³¹Na ビームを用いた中性子過剰な ³¹Mg の構造の研究

西畑洸希, 下田正, 小田原厚子, 森本翔太, 吉田晋之介, 八木彩祐未, 金岡裕志, 河村嵩之, 中橋晶, 藤原智貴, 吉住孝之, M. Pearson, C. D. P. Levy

日本物理学会 2015年3月

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開催年月日： 2020年1月

記述言語：日本語

国名：日本国
偏極不安定核 Na ビームを用いた中性子過剰 Mg 同位体の構造研究

西畑洸希, 下田正, 小田原厚子, 森本翔太, 吉田晋之介, 八木彩祐未, 金岡裕志, 河村嵩之, 中橋晶, 藤原智貴, 吉住孝之, M. Pearson, C. D. P. Levy

日本物理学会 2015年9月

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開催年月日： 2020年1月

記述言語：日本語

国名：日本国
スピン偏極 23Ne ビームを用いた単結晶電場勾配測定

西畑洸希, A. Gladkov, 川口高史, 上野秀樹, 市川雄一, 高峰愛子, 佐藤智哉, 川田敬太A，D, 山崎展樹, 小林航, 三條真, L.C.Tao, 中村祐太郎, 浅河拓光, 佐々木悠輔, 戸塚克,土井一歩,矢田智昭,旭耕一郎,石橋陽子, 今村慧, 藤田朋美, G. Georgiev, J. M. Daugas

日本物理学会 2018年3月

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開催年月日： 2020年1月

記述言語：日本語

国名：日本国
偏極Na ビームで探る中性子過剰原子核³⁰Mg, ³¹Mgの多様な原子核構造招待

西畑　洸希

日本物理学会 2019年3月

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開催年月日： 2020年1月

記述言語：日本語

国名：日本国
Study of High-Spin States in N~80 Isotones using Radioactive #D17#URN Beam Induced Fusion Reaction 国際会議

H. Nishibata, Y. Ito, R. Leguillon, C. Petrache, J. Takatsu, K. Tajiri, N. Hamatani, R. Yokoyama, A. Odahara, T. Shimoda, E. Ideguchi, H. Watanabe, Y. Wakabayashi, K. Yoshinaga, T. Suzuki, S. Nishimura, D. Beaumel, G. Lehaut, D. Guinet, P. Desesquelles, D. Curien

Nuclear Structure 2012 2012年8月

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開催年月日： 2020年1月

記述言語：英語

国名：日本国
Various Structure In Neutron-rich ³¹Mg Studied By Using Spin-polarized ³¹Na Beam 国際会議

H. Nishibata, T. Shimoda, A. Odahara, S. Morimoto, S. Yoshida, A. Yagi, H. Kanaoka, T. Kawamura, A. Nakahashi, T. Fujiwara, T. Yoshizumi, M. Pearson, C. D. P. Levy

INPC2016 2016年9月

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開催年月日： 2020年1月

記述言語：英語

国名：日本国
Study of structure change in neutron-rich Mg isotopes by spin-polarized radioactive beam 国際会議

H. Nishibata, T. Shimoda, A. Odahara, and S1391 Collaboration

4th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan 2014年10月

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開催年月日： 2020年1月

記述言語：英語

国名：日本国
Study of exotic structures in neutron-rich ³⁰Mg and ³¹Mg by spin-polarized radioactive beam 国際会議

H. Nishibata, T. Shimoda, A. Odahara, S. Morimoto, S. Yoshida, A. Yagi, H. Kanaoka, T. Kawamura, A. Nakahashi, T. Fujiwara, T. Yoshizumi, M. Pearson, C. D. P. Levy

Gamma15 2015年10月

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開催年月日： 2020年1月

記述言語：英語

国名：日本国
Shape coexistence in neutron-rich ³¹Mg investigated by beta-gamma spectroscopy of spin- polarized ³¹Na 国際会議

H. Nishibata, T. Shimoda, A. Odahara, S. Morimoto, S. Kanaya, A. Yagi, H. Kanaoka, M.R. Pearson, C.D.P. Levy, M. Kimura

ARIS2017 2017年5月

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開催年月日： 2020年1月

記述言語：英語

国名：日本国
Structure of neutron-rich ³¹Mg by β-decay spectroscopy of spin-polarized ³¹Na 国際会議

2018年10月

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開催年月日： 2020年1月

記述言語：英語

国名：日本国
Various structures of the neutron-rich nucleus ³¹Mg investigated by beta-gamma spectroscopy of spin-polarized ³¹Na 招待国際会議

H. Nishibata, T. Shimoda, A. Odahara, S. Morimoto, S. Yoshida, A. Yagi, H. Kanaoka, T. Kawamura, A. Nakahashi, T. Fujiwara, T. Yoshizumi

SPIN2016 2016年9月

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開催年月日： 2020年1月

記述言語：英語

国名：日本国
Shape coexistence in ³¹Mg revealed by b-g and b-g-n spectroscopy with spin-polarized ³¹Na 招待国際会議

H. Nishibata, T. Shimoda, A. Odahara, S. Morimoto, S. Kanaya, A. Yagi, H. Kanaoka, M.R. Pearson, C.D.P. Levy, M. Kimura

EXON2018 2018年9月

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開催年月日： 2020年1月

記述言語：英語

国名：日本国
スピン偏極Mgビームを用いた中性子過剰Alの構造研究

濵野友哉, 西畑洸希, 小田原厚子, 下田正, 前島大樹, 大上能弘, 大谷優里花, 飯村俊, 金谷晋之介, 畠山温, 浅川寛太, 関口直太, 平山賀一, 若狭智嗣, C.D.P. Levy, M.R. Pearson, J. Lassen, R. Li

日本物理学会　九州支部例会 2019年11月

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開催年月日： 2019年11月

記述言語：日本語会議種別：口頭発表（一般）

開催地：佐賀大学国名：日本国

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所属学協会

日本物理学会

共同研究・競争的資金等の研究課題

偏極核ベータ核分光法という独自の手法を用いた”逆転の島”境界原子核の構造研究

研究課題/領域番号：23K03431 2023年 - 2025年

日本学術振興会科学研究費助成事業基盤研究(C)

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担当区分：研究代表者資金種別：科研費
新奇手法による中性子過剰核の構造研究：”逆転の島”境界原子核の完全理解に向けて

研究課題/領域番号：20K14492 2020年 - 2022年

日本学術振興会科学研究費助成事業若手研究

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担当区分：研究代表者資金種別：科研費
中性子超過剰核の構造~最新技術を統合して探る新奇な核構造

研究課題/領域番号：18KK0084 2018年 - 2022年

日本学術振興会科学研究費助成事業国際共同研究強化(B)

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担当区分：研究分担者資金種別：科研費
中性子過剰核における新奇手法を用いた構造解明

研究課題/領域番号：18K13574 2018年 - 2019年

日本学術振興会科学研究費助成事業若手研究

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担当区分：研究代表者資金種別：科研費
原子核のスピン分布制御という新手法を用いた中性子超過剰核の構造の研究

研究課題/領域番号：16J05919 2016年 - 2018年

日本学術振興会科学研究費助成事業特別研究員奨励費

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担当区分：研究代表者資金種別：科研費
原子核のスピン分布制御という新手法を用いた中性子超過剰核の構造の研究

2016年 - 2018年

日本学術振興会特別研究員

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担当区分：研究代表者資金種別：共同研究
中性子過剰核の特異な構造を通じた核子間対相互作用の解明

研究課題/領域番号：13J01876 2013年 - 2015年

日本学術振興会科学研究費助成事業特別研究員奨励費

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担当区分：研究代表者資金種別：科研費
中性子過剰核の特異な構造を通じた核子間対相互作用の解明

2013年 - 2015年

日本学術振興会特別研究員

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担当区分：研究代表者資金種別：共同研究

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担当授業科目

物理学総合実験(３年学生実験)

2024年4月 - 2024年9月前期
物理学総合実験(３年学生実験)

2023年10月 - 2024年3月後期
物理学総合実験(３年学生実験)

2023年4月 - 2023年9月前期
物理学総合実験(３年学生実験)

2022年10月 - 2023年3月後期
物理学総合実験(３年学生実験)

2022年4月 - 2022年9月前期
物理学総合実験(３年学生実験)

2021年10月 - 2022年3月後期
物理学総合実験(３年学生実験)

2021年4月 - 2021年9月前期
物理学総合実験(3年学生実験)

2020年4月 - 2021年3月通年
物理学総合実験(3年学生実験)

2019年4月 - 2020年3月通年

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社会貢献活動

理化学研究所　仁科加速器研究センター　一般公開

理化学研究所 2019年4月

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対象：社会人・一般,　学術団体,　企業,　市民団体,　行政機関

海外渡航歴

2020年10月 - 2020年11月

滞在国名1：カナダ滞在機関名1：TRIUMF