Ce偶-偶同位素低激发态性质的IBM2描述  

An IBM2 Description on the Low-Lying States of Even-Even Ce Isotopes

作　　者：张大立[1] 曹华伟[2] 

机构地区：[1]湖州师范学院物理系,浙江湖州313000 [2]武汉大学电子信息学院,湖北武汉430072

出　　处：《武汉大学学报（理学版）》2002年第5期585-588,共4页Journal of Wuhan University:Natural Science Edition

基　　金：国家自然科学基金 (19875 0 0 1) ;浙江省中青年学术带头人基金资助项目

摘　　要：通过考虑同类核子相干对间的四极相互作用 ,在IBM2中对Ce偶 偶同位素1 2 8Ce 1 38Ce的低激发态能谱和E2跃迁几率及分支比进行了理论分析 ,计算结果有效地改善了IBM中这些核的准γ带能谱的Staggering现象描述 。A description on the even\|even Ce isotopes for A =128 to 138 in the framework of neutron\|proton interacting bosons model is carried out. By introducing the quadrupole interactions like boson into the Hamiltonian, the staggering phenomenon in the quasi\| γ bands is reproduced pretty well. Meanwhile, the calculated results of the energy spectra, E2 transition ratios and branching ratios of these Ce isotopes agree with the experimental data quite well. It is found that Ce isotopes are in the transition from the O(6) symmetry to SU(3) symmetry. It manifests that the ground for reducing the staggering is that the consideration on the quadrupole interactions like bosons adds a rational triaxial rotor potential to the Hamiltional with rather strong O(6) symmetry.

关 键 词：Ce偶-偶同位素 低激发态 IBM2描述 原子核结构 Ce同位素 Staggering现象 E2跃迁几率 相互作用玻色子模型 四极相互作用 

分 类 号：O571.21[理学—粒子物理与原子核物理]