相对论平均场理论对Pt同位素形状演化的研究  

Analysis of shape evolution for Pt isotopes with relativistic mean field theory

作　　者：王刚[1] 方向正[1] 郭建友[1] 

机构地区：[1]安徽大学物理与材料科学学院,合肥230039

出　　处：《物理学报》2012年第10期100-109,共10页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11175001);教育部新世纪优秀人才支持计划基金(批准号:NCET-05-0558);安徽省人才开发基金(批准号:2007Z018);安徽省自然科学基金(批准号:11040606M07);安徽省教育厅重点科研项目(批准号:KJ2009A129);安徽大学211工程资助的课题~~

摘　　要：利用形变约束的相对论平均场理论研究了Pt同位素偶-偶核的形状演化,比较了基态结合能和四极形变的理论计算值和实验值,分析了这些核的位能曲线、单粒子能级及其随四极形变β_2的变化规律,发现从N=88到N=126,Pt同位素的基态变形从球形对称核经X(5)对称性核、演化为具有稳定形变的核,再演化为球形核的变化过程.其中,^(166-172)Pt是近球形核,^(174)Pt和^(192-196)Pt位于球形和稳定形变之间,可能具有X(5)对称性,^(176-190)Pt具有稳定的变形,^(198-202)Pt是近球形核,^(204)Pt是球形核,这些结果与实验一致.The relativistic mean field theory is used to investigate the shape evolution of Pt isotopes. The calculated binding energy and deformation parameter/32 are consistent with those obtained in experiment. The potential energy surfaces and the single particle levels show the shape evolution for Pt isotopes. From N = 88 to N = 126, the shapes for Pt nuclei evolve from spherical shapes to X（5）, and then to shapes of stable quadruple deformation, finally back to the spherical shapes. In detail, 166-172^Pt are spherical. 174^pt and 192-196^pt possess the X（5） symmetry. 176-190^pt are deformed nuclei. 204^Pt holds spherical shape. These results in agreement with the experimental observations.

关 键 词：相对论平均场 位能曲线 单粒子能级 

分 类 号：O571[理学—粒子物理与原子核物理]