Large Isospin Asymmetry in Si-22/O-22 Mirror Gamow-Teller Transitions Reveals the Halo Structure of Al-22
Large Isospin Asymmetry in Si-22/O-22 Mirror Gamow-Teller Transitions Reveals the Halo Structure of Al-22
复制标题
Si-22/O-22 镜面伽莫夫特勒跃迁中的大同位旋不对称性揭示了 Al-22 的晕结构
DOI：
10.1103/physrevlett.125.192503
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发表时间：
2020
影响因子：
8.6
通讯作者：
Zho
中科院分区：
文献类型：
--
作者：
Lee J.;Xu X. X.;Kaneko K.;Sun Y.;Lin C. J.;Sun L. J.;Liang P. F.;Li Z. H.;Li J.;Wu H. Y.;Fang D. Q.;Wang J. S.;Yang Y. Y.;Yuan C. X.;Lam Y. H.;Wang Y. T.;Wang K.;Wang J. G.;Ma J. B.;Liu J. J.;Li P. J.;Zhao Q. Q.;Yang L.;Ma N. R.;Wang D. X.;Zhong F. P.;Zho
用高纯锗探测器包围的硅阵列研究了最轻的具有同位旋投影的核的延迟单质子发射。的衰变分支的属性和降低的跃迁概率的过渡到的低躺态的确定。与的镜像衰变相比，在低激发态的镜像不对称性的最大值是在到第一激发态的跃迁中。用壳模型计算的同位旋非守恒力，包括与轨道有关的，，3相互作用，明确地引入了同位旋对称破缺力，描述了轨道波函数的松散束缚性质，可以很好地再现观测数据，并一致地解释了第一激发态出现大值而第二激发态没有出现大值的观测结果。我们的结果，同时支持质子晕结构，可能提供另一种手段来识别晕核。
-delayed one-proton emissions of, the lightest nucleus with an isospin projection, are studied with a silicon array surrounded by high-purity germanium detectors. Properties of-decay branches and the reduced transition probabilities for the transitions to the low-lying states ofare determined. Compared to the mirrordecay of, the largest value of mirror asymmetry in low-lying states by far, with, is found in the transition to the firstexcited state. Shell-model calculation with isospin-nonconserving forces, including the,, 3 interaction related to theorbit that introduces explicitly the isospin-symmetry breaking force and describes the loosely bound nature of the wave functions of theorbit, can reproduce the observed data well and consistently explain the observation that a largevalue occurs for the first but not for the secondexcited state of. Our results, while supporting the proton-halo structure in, might provide another means to identify halo nuclei.