Skyrme-Hartree-Fock方法对Ca同位素基态性质的研究 (Ⅰ)结合能、壳结构、半径与密度分布  

Skyrme-Hartree-Fock Description of the Nuclear Structure in Ca Isotopes (Ⅰ)Binding Energy and Shell Effects,Radii and Density Distributions

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 

机构地区：[1]北京大学技术物理系和重离子物理所 [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4期322-328,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模型系统地研究了40 Ca到70 Ca到Ca同位素偶偶核的基态性质及其同位旋依赖性 .讨论了结合能、均方根半径、密度分布随同位旋的变化 ,研究了壳效应对结合能、双中子分离能S2n及和表面弥散厚度的影响 .结果表明壳效应在S2n、表面弥散厚度中表现得非常明显 .质子均方根半径Rrms随相对中子数I=(N -Z) /A的变化满足Rrms=35(1 +αI + βI2 )rpZ1/ 3.离心位垒对核表面以外的密度分布有很大影响 .The ground state properties of Ca isotopes far from stability line were systematically studied using the Skyrme Hartree Fock model.The shell effects on the binding energy and two neutron separation energy are discussed.The isospin dependency of the unclear radii and nucleon density distributions and the shell effects on these properties are also studied.It is shown that the neutron magic number affests the width of nuclear surface and the nucleon density distributions beyond the nuclear surface.The change of proton rms radii R rms with neutron number excess I=(N-Z)/A follows R rms =35 (1+αI+βI 2)r pZ 1/3 .The effect of the centrifugal potential on the nuclear density in the outer trach of nuclear surface is clearly shown.

关 键 词：Skyrme-Hartree-Fock模型 不稳定核 结合能 核半径 密度分布 钙同位素 基态性质 壳结构效应 放射性核束 远离稳定线原子核 

分 类 号：O571[理学—粒子物理与原子核物理]