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

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...

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Bibliographic Details
Main Authors: 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
Format: Article
Language:English
Published: Elsevier 2017-03-01
Series:Physics Letters B
Online Access:http://www.sciencedirect.com/science/article/pii/S0370269317300357
Description
Summary: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.
ISSN:0370-2693
1873-2445

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