Mass measurements of neutron-rich A ≈ 90 nuclei constrain element abundances

被引：2

作者：

Xian, W. ^{[1
,2
]}

Chen, S. ^{[1
,2
,17
]}

Nikas, S. ^{[3
]}

Rosenbusch, M. ^{[2
]}

Wada, M. ^{[2
]}

Ishiyama, H. ^{[4
]}

Hou, D. ^{[5
]}

Iimura, S. ^{[4
]}

Nishimura, S. ^{[4
]}

Schury, P. ^{[2
]}

Takamine, A. ^{[4
]}

Yan, S. ^{[6
]}

Browne, F. ^{[4
]}

Doornenbal, P. ^{[4
]}

Flavigny, F. ^{[7
]}

Hirayama, Y. ^{[2
]}

Ito, Y. ^{[8
]}

Kimura, S. ^{[4
]}

Kojima, T. M. ^{[4
]}

Lee, J. ^{[1
]}

Liu, J. ^{[1
]}

Miyatake, H. ^{[2
]}

Michimasa, S. ^{[9
]}

Moon, J. Y. ^{[10
]}

Naimi, S. ^{[4
]}

Niwase, T. ^{[2
,4
,11
]}

Sonoda, T. ^{[4
]}

Suzuki, D. ^{[4
]}

Watanabe, Y. X. ^{[2
]}

Werner, V. ^{[12
,13
]}

Wimmer, K. ^{[4
,14
,15
]}

Wollnik, H. ^{[16
]}

机构：

[1] Univ Hong Kong, Dept Phys, Pokfulam, Hong Kong 999077, Peoples R China

[2] KEK Wako Nucl Sci Ctr, Wako, Saitama 3510198, Japan

[3] Univ Jyvaskyla, Dept Phys, FI-40014 Jyvaskyla, Finland

[4] RIKEN Nishina Ctr, Wako, Saitama 3510198, Japan

[5] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China

[6] Jinan Univ, Inst Mass Spectrometry & Atmospher Environm, Guangzhou 510632, Peoples R China

[7] Univ Caen Normandie, ENSICAEN, LPC Caen, UMR6534,CNRS IN2P3, F-14000 Caen, France

[8] Japan Atom Energy Agcy, Adv Sci Res Ctr, Ibaraki 3191195, Japan

[9] Univ Tokyo, Ctr Nucl Study CNS, Bunkyo, Tokyo 1130033, Japan

[10] Inst for Basic Sci Korea, 70 Yuseong Daero 1689 Gil, Daejeon 305811, South Korea

[11] Kyushu Univ, Higashi Ku, Fukuoka 8128581, Japan

[12] Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany

[13] GSI Helmholtzzentrum Schwerionenforsch, Helmholtz Forsch Akad Hessen FAIR HFHF, Campus Darmstadt, D-64289 Darmstadt, Germany

[14] Univ Tokyo, Dept Phys, 7-3-1 Hongo,Bunkyo, Tokyo 1130033, Japan

[15] GSI Helmholtzzentrum Schwerionenforsch, D-64291 Darmstadt, Germany

[16] New Mexico State Univ, Las Cruces, NM 88001 USA

[17] Univ York, Dept Phys, York, England

来源：

PHYSICAL REVIEW C | 2024年 / 109卷 / 03期

基金：

日本学术振兴会;

关键词：

MODEL; SPECTROGRAPH; DEFORMATION; FORMULA; MERGER; RIKEN; PEAK;

D O I：

10.1103/PhysRevC.109.035804

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

Atomic masses of the neutron-rich isotopes 83,84Ga, 82-86Ge, 82-89As, 82,84-91Se, 85,86,89-92Br, 89,91,92Kr, and 91Rb have been measured with high precision and accuracy using the multi-reflection time-of-flight mass spectrograph at the RIBF facility. The masses of 88,89As were measured for the first time and the mass uncertainties of 86Ge and 90,91Se were significantly reduced from several hundred keV to below the 10 keV scale. Investigation of shell evolution and potential subshell closures are proceeded by analysis of two-neutron separation energy systematics. As a result of the precise mass measurements, no prominent change on the slope of the two-neutron separation energy beyond N = 56 is observed in Se isotopes, indicating the subshell closure effect at N = 56 of Se does not exist. Also, various leading mass models are compared with the measurements. The impact of the more precisely known data on r-process nucleosynthesis calculations is investigated in light of these new mass measurements, showing a remarkable reduction of reaction-rate uncertainties.

引用

页数：10

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