超重核^(296)Og的结构和α衰变

Structure and α Decay of Superheavy Nucleus ^(296)Og

在变形的Skyrme-Hartree-Fock-Bogoliubov(SHFB)理论框架下,利用SLy4相互作用研究体积、表面和混合对力对超重核^(296)Og基态性质,如位能面、单粒子能谱、双中子分离能及α衰变能的影响。研究表明:1)体积和混合对力预言的^(296)Og的基态形状接近于球形,而表面对力预言其有着明显的形状共存;2)三种对力预言^(296)Og都具有超形变,对力对超形变态的结合能、位阱深度和激发能有着一定的影响,且表面对力的影响最大;3)对力对^(296)Og的壳结构、双中子分离能、α衰变能和α衰变半衰期有着一定的影响。同样地,表面对力的影响也最明显。而且,由对力引起的α衰变能的变化,有时会导致α衰变半衰期的数量级发生改变。

The nuclear ground state properties of the superheavy nucleus ^(296)Og,such as the potential energy surface,singleparticle energy spectrum,two-neutron separation energy and α-decay energy,are studied with the volume,surface and mixed pairings based on the SLy4 interaction in the framework of the deformed Skyrme-Hartree-Fock-Bogoliubov(SHFB)theory.It is found that 1)The ground state shape of ^(296)Og is nearly spherical with the volume and mixed pairings.However,the shape coexistence of ^(296)Og is predicted with the surface pairing.2)The super-deformed states are predicted by all of the three kinds of pairings.The binding energy,potential well depth and excitation energy of the super-deformed states are influenced by the pairings.At the same time,the surface pairing effect on the properties of the super-deformed states is the most evident.3)The pairings have certain influence on the shell structure,two-neutron separation energy,α-decay energy andα-decay half-life of ^(296)Og and the impact from the surface pairing is the strongest.Moreover,the order of magnitude ofα-decay half-life is varied occasionally owing to the change of theα-decay energy caused by the pairings.