Octupole deformation for Ba isotopes in a reflection-asymmetric relativistic mean-field approach

ZHANG Wei; LI Zhi-Pan; ZHANG Shuang-Quan

doi:10.1088/1674-1137/34/8/011

Chinese Physics C> 2010, Vol. 34> Issue(8) : 1094-1099 DOI: 10.1088/1674-1137/34/8/011

Octupole deformation for Ba isotopes in a reflection-asymmetric relativistic mean-field approach

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Abstract：
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 (ν2f_7/2, ν1i_13/2) and (π2d_5/2, π1h_11/2) is demonstrated by analyzing the single-particle levels near Fermi surfaces in ¹⁴⁸Ba.

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ZHANG Wei, LI Zhi-Pan and ZHANG Shuang-Quan. Octupole deformation for Ba isotopes in a reflection-asymmetric relativistic mean-field approach[J]. Chinese Physics C, 2010, 34(8): 1094-1099. doi: 10.1088/1674-1137/34/8/011

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Received: 2010-03-01
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Octupole deformation for Ba isotopes in a reflection-asymmetric relativistic mean-field approach

Corresponding author: ZHANG Shuang-Quan,

Received Date: 2010-03-01

Accepted Date: 2010-03-19

Available Online: 2010-08-05

Abstract:

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 (ν2f_7/2, ν1i_13/2) and (π2d_5/2, π1h_11/2) is demonstrated by analyzing the single-particle levels near Fermi surfaces in ¹⁴⁸Ba.

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Octupole deformation for Ba isotopes in a reflection-asymmetric relativistic mean-field approach

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