偶偶Ra同位素的八极形变研究  

Octupole deformation in even-even Ra isotopes

作　　者：焦朋[1] 郭建友[1] 方向正[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》2010年第4期2369-2374,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10475001;10675001);教育部新世纪优秀人才支持计划(批准号:NCET-05-0558);安徽省人才开发基金(批准号:2007Z018);安徽省教育厅重点科研项目(批准号:KJ2009A129)资助的课题~~

摘　　要：用反射不对称的相对论平均场理论(RAS-RMF)对偶偶Ra同位素的八极形变进行了系统研究,并与实验数据和有限力程小液滴模型(FRDM)结果进行了比较.结果表明:RAS-RMF理论很好地描述了Ra同位素的基态性质,计算的结合能、双中子分离能和形变与实验数据和FRDM一致.RAS-RMF理论获得的中子、质子密度分布清晰地展现出偶偶Ra同位素由球形逐渐转变为八极形变,到四极形变的过程,与实验观察的八极形变不稳定现象一致.The octupole deformation of even-even Raisotopes has been investigated systematically by the reflection asymmetric relativistic mean field（RAS-RMF） theory.The results are compared with the experimental data together with the results from FRDM.It is shown that RAS-RMF theory gives a good description for Ra isotopes.The calculated binding energy,two neutron separation energy and deformation agree with the experimental data well.In particular,RAS-RMF theory provides the neutron and proton densities which show clearly the shape evolution of these nuclei from nearly spherical to well-developed octupole and finally back to quadrupole deformation shapes.This is in accordance with experimental observation.

关 键 词：反射不对称平均场(RAS-RMF) 八极形变 偶偶核 

分 类 号：O571.2[理学—粒子物理与原子核物理]