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

作　　者：任秀宰[1,2,3] 孟杰[1,2,3] 周善贵[1,2,3] 杨泗春[1,2,3] 龙文辉[1,2,3] 

机构地区：[1]北京大学技术物理系和重离子物理研究所 [2]兰州重离子加速器国家实验室原子核理论中心兰州730000 [3]中国科学院理论物理研究所北京100080

出　　处：《高能物理与核物理》2001年第5期405-411,共7页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金!资助 ( 1 984 70 0 2和 1 993 50 3 0 )&&

摘　　要：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.

关 键 词：Skyrme-Hartree-Fock模型 钙同位素 中子晕 中子皮 纯中子物质 经典禁区内粒子 基态性质 

分 类 号：O571[理学—粒子物理与原子核物理]