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, π1h.11/2) is demonstrated by analyzing the single-particle levels near Fermi surfaces in 148Ba.
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