Nuclear Fusion Award 2009 speech

[摘要] The potential energy surfaces of even-even 142–156Ba are investigated in the constrained reflectionasymmetric 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. Inparticular, the nuclei 148,150Ba with N=92, 94 have the largest octupole deformations. By including theoctupole degree of freedom, energy gaps N = 88, N = 94 and Z = 56 near Fermi surfaces for the singleparticle levels in 148Ba with β2 ∼ 0.26 and β3 ∼ 0.17 are found. Furthermore, the performance of the octupoledeformation driving pairs (ν2f7/2, ν1i13/2) and (π2d5/2, π1h11/2) is demonstrated by analyzing the singleparticle levels near Fermi surfaces in 148Ba.

[关键词] reflection-asymmetric;relativistic mean-field;octupole deformation;single-particle levels