XU, X.X.; LIN, C.J.; SUN, L.J.; WANG, J.S.; LAM, Y.H.; LEE, J.; FANG, D.Q.; LI, Z.H.; SMIRNOVA, N.A.; YUAN, C.X.; YANG, L.; WANG, Y.T.; LI, J.; MA, N.R.; WANG, K.; ZANG, H.L.; WANG, H.W.; LI, C.; LIU, M.L.; WANG, J.G.; SHI, C.Z.; NIE, M.W.; LI, X.F.; LI, H.; MA, J.B.; MA, P.; JIN, S.L.; HUANG, M.R.; BAI, Z.; YANG, F.; JIA, H.M.; LIU, Z.H.; WANG, D.X.; YANG, Y.Y.; ZHOU, Y.J.; MA, W.H.; CHEN, J.; HU, Z.G.; WANG, M.; ZHANG, Y.H.; MA, X.W.; ZHOU, X.H.; MA, Y.G.; XU, H.S.; XIAO, G.Q.; ZHANG, H.Q.

doi:10.1016/j.physletb.2017.01.028

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Phys.Lett.B. 2017, vol. 766, p. 312-316

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The decay of the lightest nucleus with Tz=−3 , 22 Si, 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 22 Al. 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 22 Si was obtained indirectly in the experiment for the first time. Two-proton separation energy for 22 Si is deduced to be −108 (125) keV, which indicates that it is a very marginal candidate for two-proton ground-state emission.< Réduire

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Observation of $β$-delayed two-proton emission in the decay of $^{22}$Si

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