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

  • 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, π1h11/2) 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
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 shu
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Received: 2010-03-01
Revised: 2010-03-19
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Octupole deformation for Ba isotopes in a reflection-asymmetric relativistic mean-field approach

    Corresponding author: ZHANG Shuang-Quan,

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 (ν2f7/2, ν1i13/2) and (π2d5/2, π1h11/2) is demonstrated by analyzing the single-particle levels near Fermi surfaces in 148Ba.

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