Octupole deformation for Ba isotopes in a reflection-asymmetric relativistic mean-field approach
Octupole deformation for Ba isotopes in a reflection-asymmetric relativistic mean-field approach
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DOI：
10.1088/1674-1137/34/8/011
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发表时间：
2010-08
影响因子：
3.6
通讯作者：
Zhang Wei;Li Zhi-pan;Zhang Shuang-quan
中科院分区：
文献类型：
--
作者：
Zhang Wei;Li Zhi-pan;Zhang Shuang-quan
本文用约束反射非对称相对论平均场方法研究了偶-偶142− 156 Ba的势能面。结果表明，对于基态，142 Ba是近球形的，156 Ba是四极形变的，144 - 154 Ba是八极形变的。特别地，N = 92、94的核148、150 Ba具有最大的八极形变。在考虑八极自由度的情况下，得到了β2 ~ 0.26和β3 ~ 0.17的148 Ba单粒子能级在费米面附近的能隙N = 88，N = 94，Z = 56，并进一步讨论了八极形变驱动对的性能通过对148 Ba费米面附近的单粒子能级的分析，证明了（ν 2f 7/2，ν 1 i13/2）和（π 2d 5/2，π1h.11/2）两个能级的存在.
The potential energy surfaces of even-even 142−156Ba are investigated in the constrained reflection-asymmetric relativistic mean-field approach with parameter set PK1. It is shown that for the ground states, 142Ba is near spherical, 156Ba well quadrupole-deformed, and in between 144−154Ba octupole deformed. In particular, the nuclei 148,150Ba with N = 92, 94 have the largest octupole deformations. By including the octupole degree of freedom, energy gaps N = 88, N = 94 and Z = 56 near Fermi surfaces for the single-particle levels in 148Ba with β2 ~ 0.26 and β3 ~ 0.17 are found. Furthermore, the performance of the octupole deformation driving pairs (ν2f7/2, ν1i13/2) and (π2d5/2, π1h.11/2) is demonstrated by analyzing the single-particle levels near Fermi surfaces in 148Ba.