Unexpected spin-parity assignments of the excited states in 9Be
Unexpected spin-parity assignments of the excited states in 9Be
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9Be 中激发态的意外自旋宇称分配
DOI：
10.1103/physrevc.91.024328
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
H. Yano
中科院分区：
文献类型：
--
作者：
Y. Hirayama;T. Shimoda;H. Miyatake;H. Izumi;A. Hatakeyama;K.P. Jackson;C.D.P. Levy;M. Pearson;M. Yagi;H. Yano
通过自旋极化的延迟中子衰变研究了轻核的激发态。首次观测到中子从2.43-、2.78-、4.704-、5.59-和7.94 mev态跃迁，并通过对衰变不对称的巧合和测量确定了激发态的自旋和对偶。2.43-MeV态的自旋宇称为，与报道值一致。目前的结果表明，2.78-、4.704-、5.59-和7.94-MeV态的值分别为…和，这与早期报道的值不同。然而，除了2.78- mev和4.704-MeV的值外，壳层的壳模型计算总体上与本文的结果一致。
The excited states in the light nucleusare studied through-delayed neutron decays from spin-polarized. The neutron transitions viafrom the 2.43-, 2.78-, 4.704-, 5.59-, and 7.94-MeV states inare observed for the first time, and the spins and parities ('s) of the excited states inare assigned fromcoincidences and measurements of the-decay asymmetries. The spin parity,, of the 2.43-MeV state is assigned to be, which is consistent with the reported value. The present results suggest that thevalues of the 2.78-, 4.704-, 5.59-, and 7.94-MeV states are,,, and, respectively, which are different from early reported values. However, shell-model calculations of theshell are in overall good agreement with the present results, except for thevalues of the 2.78- and 4.704-MeV states.