Masses of neutron-rich 52-54SC and 54,56Ti nuclides: The N=32 subshell closure in scandium

被引：35

作者：

Xu, X. ^{[1
,2
,3
]}

Wang, M. ^{[1
,2
]}

Blaum, K. ^{[4
]}

Holt, J. D. ^{[5
]}

Litvinov, Yu A. ^{[1
,2
,6
]}

Schwenk, A. ^{[4
,7
,8
]}

Simonis, J. ^{[7
,8
,9
,10
]}

Stroberg, S. R. ^{[5
,11
]}

Zhang, Y. H. ^{[1
,2
,8
]}

Xu, H. S. ^{[1
,2
]}

Shuai, P. ^{[1
,2
]}

Tu, X. L. ^{[1
,2
]}

Zhou, X. H. ^{[1
,2
]}

Xu, F. R. ^{[12
]}

Audi, G. ^{[13
]}

Chen, R. J. ^{[1
,2
]}

Chen, X. C. ^{[1
,2
]}

Fu, C. Y. ^{[1
,2
]}

Ge, Z. ^{[1
,2
]}

Huang, W. J. ^{[4
]}

Litvinov, S. ^{[6
]}

Liu, D. W. ^{[1
,2
]}

Lam, Y. H. ^{[1
,2
]}

Ma, X. W. ^{[1
,2
]}

Mao, R. S. ^{[1
,2
]}

Ozawa, A. ^{[14
]}

Sun, B. H. ^{[15
]}

Sun, Y. ^{[16
]}

Uesaka, T. ^{[17
]}

Xiao, G. Q. ^{[1
,2
]}

Xing, Y. M. ^{[1
,2
]}

Yamaguchi, T. ^{[18
]}

Yamaguchi, Y. ^{[17
]}

Yan, X. L. ^{[1
,2
]}

Zeng, Q. ^{[1
,2
]}

Zhao, H. W. ^{[1
,2
]}

Zhao, T. C. ^{[1
,2
]}

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

Zhan, W. L. ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Key Lab High Precis Nucl Spect, Inst Modern Phys, Lanzhou 730000, Gansu, Peoples R China

[2] Chinese Acad Sci, Ctr Nucl Matter Sci, Inst Modern Phys, Lanzhou 730000, Gansu, Peoples R China

[3] Xi An Jiao Tong Univ, Sch Sci, Xian 710049, Shaanxi, Peoples R China

[4] Max Planck Inst Kernphys, D-69117 Heidelberg, Germany

[5] TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada

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

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

[8] GSI Helmholtzzentrum Schwerionenforsch GmbH, ExtreMe Matter Inst EMMI, D-64291 Darmstadt, Germany

[9] Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany

[10] Johannes Gutenberg Univ Mainz, PRISMA Cluster Excellence, D-55099 Mainz, Germany

[11] Reed Coll, Portland, OR 97202 USA

[12] Peking Univ, Sch Phys, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China

[13] Univ Paris Sud, CNRS, CSNSM, IN2P3, F-91405 Orsay, France

[14] Univ Tsukuba, Inst Phys, Ibaraki 3058571, Japan

[15] Beihang Univ, Sch Phys & Nucl Energy Engn, Beijing 100191, Peoples R China

[16] Shanghai Jiao Tong Univ, Dept Phys & Astron, Shanghai 200240, Peoples R China

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

[18] Saitama Univ, Dept Phys, Saitama 3388570, Japan

来源：

PHYSICAL REVIEW C | 2019年 / 99卷 / 06期

基金：

国家重点研发计划; 欧洲研究理事会; 加拿大自然科学与工程研究理事会;

关键词：

EXOTIC NUCLEI; ISOTOPES; SPECTROMETRY; DETECTOR;

D O I：

10.1103/PhysRevC.99.064303

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：

Isochronous mass spectrometry has been applied in the storage ring CSRe to measure the masses of the neutron-rich Sc52-54 and Ti-54,Ti-56 nuclei. The new mass excess values ME (Sc-52) = - 40525(65) keV, ME(Sc-53) = -38910(80) keV, and ME(Sc-54) = -34485(360) keV, deviate from the Atomic Mass Evaluation 2012 by 2.3 sigma, 2.8 sigma, and 1.7 sigma, respectively. These large deviations significantly change the systematics of the two-neutron separation energies of scandium isotopes. The empirical shell gap extracted from our new experimental results shows a significant subshell closure at N = 32 in scandium, with a similar magnitude as in calcium. Moreover, we present ab initio calculations using the valence-space in-medium similarity renormalization group based on two- and three-nucleon interactions from chiral effective field theory. The theoretical results confirm the existence of a substantial N = 32 shell gap in Sc and Ca with a decreasing trend towards lighter isotones, thus providing a consistent picture of the evolution of the N = 32 magic number from the pf into the sd shell.

引用

页数：6

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