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超重核296Og的结构和α衰变

Structure and α Decay of Superheavy Nucleus 296Og

  • 摘要: 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296Og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296Og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296Og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296Og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。

     

    Abstract: The nuclear ground state properties of the superheavy nucleus 296Og, such as the potential energy surface, single-particle 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 296Og is nearly spherical with the volume and mixed pairings. However, the shape coexistence of 296Og 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 and α-decay half-life of 296Og and the impact from the surface pairing is the strongest. Moreover, the order of magnitude of α-decay half-life is varied occasionally owing to the change of the α-decay energy caused by the pairings.

     

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