Skyrme-Hartree-Fock方法对Ca同位素基态性质的研究(Ⅱ)中子晕、中子皮与经典禁区内粒子

Skyrme-Hartree-Fock Description of the Nuclear Structure in Ca Isotopes (Ⅱ)Neutron Halo, Skin and Particles in the Classically Forbidden Area

用Skyrme Hartree Fock模型研究了Ca同位素的纯中子物质的厚度和经典禁区内粒子数随同位旋的变化 .定义了零粒子半径和单粒子半径 ,并用这两种半径定义方法研究纯中子物质厚度后发现 :纯中子物质的厚度明显地受到壳结构的影响 ,零粒子半径和单粒子半径是探讨中子晕比较合适的物理量 .经典禁区内质子数和中子数的差别可以作为定义中子晕或中子皮的指标 .

The pure neutron matter together with the neutron skin or halo in Ca isotopes is studied using the Skyrme Hartree Fock model. It is shown that the pure neutron matter thickness depends not only on the Fermi levels of the neutrons, but also on the orbital angular momentum of the valence neutrons. A new definition for the thickness of pure neutron matter is proposed. Particles in classically forbidden area are also studied. The number of neutrons in the classically forbidden area increases with mass number A, because of the increase in the number of neutrons occupied in the weaklybound open shell. The number of protons in the classically forbidden area, in contrast, decreases with mass number A, because the orbits of protons become more deeply bound. It is shown that the number of particles in the classically forbidden area can give information on the appearance of the halo or skin.