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Title: Observation of β-delayed two-proton emission in the decay of 22Si

The decay of the lightest nucleus with Tz=-3, 22Si, was studied by a silicon array. A charged-particle group at 5600 (70) keV in the decay-energy spectrum was identified experimentally as β-delayed two-proton emission from the isobaric analog state (IAS) of 22Al. Experimental results of the IAS fed by a superallowed Fermi transition were compared with our large-scale shell-model calculations. The ground-state mass of 22Si was obtained indirectly in the experiment for the first time. Two-proton separation energy for 22Si is deduced to be -108 (125) keV, which indicates that it is a very marginal candidate for two-proton ground-state emission.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [3] ;  [6] ;  [7] ;  [3] ;  [6] ;  [7] ;  [6] ;  [6] ;  [4] ;  [4] more »;  [6] ;  [6] ;  [6] ;  [6] ;  [4] ;  [4] ;  [4] ;  [4] ;  [4] ;  [3] ;  [3] ;  [3] ;  [3] ;  [4] ;  [4] ;  [4] ;  [4] ;  [4] ;  [4] ;  [4] ;  [4] ;  [4] ;  [6] ;  [4] ;  [4] ;  [3] « less
  1. China Institute of Atomic Energy, Beijing (China); Univ. of Hong Kong (China). Dept. of Physics
  2. China Institute of Atomic Energy, Beijing (China); Guangxi Normal University, Guilin (China). College of Physics and Technology
  3. China Institute of Atomic Energy, Beijing (China)
  4. Chinese Academy of Sciences, Lanzhou (China). Institute of Modern Physics
  5. Univ. of Hong Kong (China). Dept. of Physics
  6. Shanghai Institute of Applied Physics, Chinese Academy of Sciences (China)
  7. Peking University, Beijing (China). School of Physic and State Key Laboratory of Nuclear Physics and Technology
  8. CENBG, CNRS/IN2P3 and Universite de Bordeaux, Chemin du Solarium (France)
  9. Sun Yat-Sen University, Zhuhai (China). Sino-French Institute of Nuclear Engineering and Technology
Publication Date:
Grant/Contract Number:
AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 766; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
OSTI Identifier:
1423615