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β-delayed two-proton decay of S27 at the proton-drip line

G. Z. Shi (石国柱)1,2,3,*, J. J. Liu (刘嘉健)1,*, Z. Y. Lin (林喆阳)1,2, H. F. Zhu (朱浩钒)1,4, X. X. Xu (徐新星)1,5,6,3,7,†, L. J. Sun (孙立杰)6,8,‡, P. F. Liang (梁鹏飞)5, C. J. Lin (林承键)6,9, J. Lee (李晓菁)5 et al.

C. X. Yuan (袁岑溪)10, S. M. Wang (王思敏)11, Z. H. Li (李智焕)11, H. S. Xu (徐瑚珊)1,3,7, Z. G. Hu (胡正国)1,3,7, Y. Y. Yang (杨彦云)1, R. F. Chen (陈若富)1, J. S. Wang (王建松)12,1, D. X. Wang (王东玺)6, H. Y. Wu (吴鸿毅)11, K. Wang (王康)1,13, F. F. Duan (段芳芳)1,2, Y. H. Lam (蓝乙华)1,3, P. Ma (马朋)1, Z. H. Gao (高志浩)1,2, Q. Hu (胡强)1, Z. Bai (白真)1, J. B. Ma (马军兵)1, J. G. Wang (王建国)1, F. P. Zhong (钟福鹏)9,6, C. G. Wu (武晨光)11, D. W. Luo (罗迪雯)11, Y. Jiang (蒋颖)11, Y. Liu (刘洋)11, D. S. Hou (侯东升)1,3, R. Li (李忍)1,3, N. R. Ma (马南茹)6, W. H. Ma (马维虎)1,14, G. M. Yu (余功明)1,15, D. Patel1,16, S. Y. Jin (金树亚)1,3, Y. F. Wang (王煜峰)1,17, Y. C. Yu (余悦超)1,17, Q. W. Zhou (周清武)1,18, P. Wang (王鹏)1,18, L. Y. Hu (胡力元)15, X. Wang (王翔)11, H. L. Zang (臧宏亮)11, P. J. Li (李朋杰)5, Q. R. Gao (高祺锐)1, H. Jian (简豪)1, S. X. Zha (查思贤)1,3, F. C. Dai (戴凡超)1,3, R. Fan (范锐)1,3, Q. Q. Zhao (赵青青)5, L. Yang (杨磊)6, P. W. Wen (温培威)6, F. Yang (杨峰)6, H. M. Jia (贾会明)6, G. L. Zhang (张高龙)19, M. Pan (潘敏)19,6, X. Y. Wang (汪小雨)19, H. H. Sun (孙浩瀚)6, X. H. Zhou (周小红)1,3,7, Y. H. Zhang (张玉虎)1,3,7, M. Wang (王猛)1,3,7, M. L. Liu (柳敏良)1, H. J. Ong (王惠仁)1,3,20,21, and W. Q. Yang (杨维青)1

  • 1CAS Key Laboratory of High Precision Nuclear Spectroscopy, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
  • 2School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
  • 3School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
  • 4School of Physics and Engineering, Zhengzhou University, Zhengzhou 450001, China
  • 5Department of Physics, The University of Hong Kong, Hong Kong, China
  • 6Department of Nuclear Physics, China Institute of Atomic Energy, Beijing 102413, China
  • 7Advanced Energy Science and Technology Guangdong Laboratory, Huizhou 516003, China
  • 8School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
  • 9College of Physics and Technology, Guangxi Normal University, Guilin 541004, China
  • 10Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-Sen University, Zhuhai 519082, China
  • 11State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
  • 12College of Science, Huzhou University, Huzhou 313000, China
  • 13Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
  • 14Institute of Modern Physics, Fudan University, Shanghai 200433, China
  • 15Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin 150001, China
  • 16Department of Physics, Sardar Vallabhbhai National Institute of Technology Surat 395007, India
  • 17School of Physics and Astronomy, Yunnan University, Kunming 650091, China
  • 18School of Physical Science and Technology, Southwest University, Chongqing 400044, China
  • 19School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China
  • 20RCNP, Osaka University, Osaka 567-0047, Japan
  • 21Joint Department for Nuclear Physics, Lanzhou University and Institute of Modern Physics, CAS, Lanzhou 730000, China

  • *These authors contributed equally to this work and should be considered co-first authors.
  • †xinxing@impcas.ac.cn
  • ‡sunli@frib.msu.edu
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Phys. Rev. C 103, L061301 – Published 15 June, 2021

DOI: https://doi.org/10.1103/PhysRevC.103.L061301

Abstract

The β-delayed two-proton (β2p) decay of S27 was studied using a state-of-the-art silicon array and Clover-type HPGe detectors. An energy peak at 6372(15) keV with a branching ratio of 2.4(5)% in the decay-energy spectrum was identified as a two-proton transition via the isobaric-analog state in P27 to the ground state of Al25 in the β decay of S27. Two-proton angular correlations were measured by the silicon array to study the mechanism of two-proton emission. Based on experimental results and Monte Carlo simulations, it was found that the main mechanism for the emission of β2p by S27 is of sequential nature.

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Phys. Rev. C 103, L061301– Published 15 June, 2021
  • Received 3 March 2021
  • Accepted 21 May 2021
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