Direct observation of the exotic β-γ-α decay mode in the Tz =-1 nucleus 20Na

被引：7

作者：

Wang, Y. B. ^{[1
]}

Su, J. ^{[2
]}

Han, Z. Y. ^{[1
]}

Tang, B. ^{[1
]}

Cui, B. Q. ^{[1
]}

Ge, T. ^{[1
]}

Lyu, Y. L. ^{[1
]}

Brown, B. A. ^{[3
,4
]}

Yuan, C. X. ^{[5
]}

Chen, L. H. ^{[1
]}

Chen, Z. Q. ^{[6
]}

Dai, B. ^{[6
]}

Guo, B. ^{[1
]}

Li, X. Y. ^{[1
]}

Li, Y. J. ^{[1
]}

Li, Z. H. ^{[1
]}

Lian, G. ^{[1
]}

Ma, R. G. ^{[1
]}

Ma, T. L. ^{[1
]}

Ma, X. ^{[1
]}

Nan, D. ^{[1
]}

Shen, Y. P. ^{[1
]}

Su, Y. ^{[1
]}

Wang, C. G. ^{[6
]}

Wu, H. Y. ^{[6
]}

Xu, F. R. ^{[6
]}

Yan, S. Q. ^{[1
]}

Zeng, S. ^{[1
]}

Zhang, H. ^{[1
]}

Zhang, L. ^{[1
]}

Zheng, Y. ^{[1
]}

Zhou, C. ^{[7
]}

Dang, Y. L. ^{[1
]}

Fu, G. Y. ^{[1
]}

He, Y. F. ^{[1
]}

Liu, F. L. ^{[1
]}

Wu, D. ^{[1
]}

Zhang, T. J. ^{[1
]}

Liu, W. P. ^{[1
]}

机构：

[1] China Inst Atom Energy, POB 275 10, Beijing 102413, Peoples R China

[2] Beijing Normal Univ, Coll Nucl Sci & Technol, Beijing 100875, Peoples R China

[3] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA

[4] Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA

[5] Sun Yat Sen Univ, Sino French Inst Nucl Engn & Technol, Zhuhai 519082, Peoples R China

[6] Peking Univ, Sch Phys, Beijing 100871, Peoples R China

[7] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China

来源：

PHYSICAL REVIEW C | 2021年 / 103卷 / 01期

基金：

中国国家自然科学基金;

关键词：

ENERGY-LEVELS; STATE; NE-20; RADIOACTIVITY; BEAM; SPIN;

D O I：

10.1103/PhysRevC.103.L011301

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：

The exotic beta-gamma-alpha decay mode of Na-20 has been directly observed for the first time in the Day-one experiment at the Beijing Radioactive Ion-beam Facility. The Na-20 source was produced by using a 100-MeV proton beam bombarding a stack of microporous MgO thick target and delivered as an intense mass separated beam after online ionization. A high-efficiency simultaneous measurement of beta, gamma, and alpha transitions enables the beta-delayed gamma-gamma and alpha-gamma coincidence spectroscopy. Three beta-gamma-alpha exotic decay sequences in Na-20 are discovered, which expands the rare decay modes observed in beta decay. Moreover, a beta-alpha-decay sequence to the 6130-keV 3(-) state of O-16 is observed, which is likely through the 12 367-keV 1(+) state in Ne-20. The experimentally deduced B(F) and B(GT) are compared to the shell-model calculation, the allowed beta transition strengths can be well accounted for by using sd shell-model space interactions.

引用

页数：6

共 37 条

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