Physics Letters B (Mar 2017)
Observation of β-delayed two-proton emission in the decay of 22Si
- X.X. Xu,
- C.J. Lin,
- L.J. Sun,
- J.S. Wang,
- Y.H. Lam,
- J. Lee,
- D.Q. Fang,
- Z.H. Li,
- N.A. Smirnova,
- C.X. Yuan,
- L. Yang,
- Y.T. Wang,
- J. Li,
- N.R. Ma,
- K. Wang,
- H.L. Zang,
- H.W. Wang,
- C. Li,
- M.L. Liu,
- J.G. Wang,
- C.Z. Shi,
- M.W. Nie,
- X.F. Li,
- H. Li,
- J.B. Ma,
- P. Ma,
- S.L. Jin,
- M.R. Huang,
- Z. Bai,
- F. Yang,
- H.M. Jia,
- Z.H. Liu,
- D.X. Wang,
- Y.Y. Yang,
- Y.J. Zhou,
- W.H. Ma,
- J. Chen,
- Z.G. Hu,
- M. Wang,
- Y.H. Zhang,
- X.W. Ma,
- X.H. Zhou,
- Y.G. Ma,
- H.S. Xu,
- G.Q. Xiao,
- H.Q. Zhang
Affiliations
- X.X. Xu
- China Institute of Atomic Energy, Beijing 102413, China
- C.J. Lin
- China Institute of Atomic Energy, Beijing 102413, China
- L.J. Sun
- China Institute of Atomic Energy, Beijing 102413, China
- J.S. Wang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- Y.H. Lam
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- J. Lee
- Department of Physics, The University of Hong Kong, Hong Kong, China
- D.Q. Fang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
- Z.H. Li
- School of Physic and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
- N.A. Smirnova
- CENBG, CNRS/IN2P3 and Université de Bordeaux, Chemin du Solarium, 33175 Gradignan cedex, France
- C.X. Yuan
- Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-Sen University, Zhuhai 519082, China
- L. Yang
- China Institute of Atomic Energy, Beijing 102413, China
- Y.T. Wang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
- J. Li
- School of Physic and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
- N.R. Ma
- China Institute of Atomic Energy, Beijing 102413, China
- K. Wang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
- H.L. Zang
- School of Physic and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
- H.W. Wang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
- C. Li
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
- M.L. Liu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- J.G. Wang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- C.Z. Shi
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
- M.W. Nie
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
- X.F. Li
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
- H. Li
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
- J.B. Ma
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- P. Ma
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- S.L. Jin
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- M.R. Huang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- Z. Bai
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- F. Yang
- China Institute of Atomic Energy, Beijing 102413, China
- H.M. Jia
- China Institute of Atomic Energy, Beijing 102413, China
- Z.H. Liu
- China Institute of Atomic Energy, Beijing 102413, China
- D.X. Wang
- China Institute of Atomic Energy, Beijing 102413, China
- Y.Y. Yang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- Y.J. Zhou
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- W.H. Ma
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- J. Chen
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- Z.G. Hu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- M. Wang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- Y.H. Zhang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- X.W. Ma
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- X.H. Zhou
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- Y.G. Ma
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
- H.S. Xu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- G.Q. Xiao
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- H.Q. Zhang
- China Institute of Atomic Energy, Beijing 102413, China
- DOI
- https://doi.org/10.1016/j.physletb.2017.01.028
- Journal volume & issue
-
Vol. 766,
no. C
pp. 312 – 316
Abstract
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.
