Observation of beta-delayed two-proton emission in the decay of Si-22
Observation of beta-delayed two-proton emission in the decay of Si-22
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Si-22 衰变中 β 延迟双质子发射的观察
DOI：
10.1016/j.physletb.2017.01.028
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发表时间：
2017
影响因子：
4.4
通讯作者：
H
中科院分区：
文献类型：
--
作者：
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.;H
最轻的原子核（T z=− 3，22 Si）的衰变是用硅阵列研究的。在衰变能谱中发现了一个位于5600（70）keV的带电粒子群，它是22 Al的同量异位素类似态（IAS）的β延迟双质子发射，并将超允许费米跃迁激发的IAS的实验结果与我们的大尺度壳模型计算结果进行了比较.实验中首次间接获得了22Si的基态质量。22 Si的双质子分离能被推导为− 108（125）keV，这表明它是一个非常边缘的双质子基态发射候选者。
The decay of the lightest nucleus with T z=− 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.