丰中子奇A核^(145,147)Ce的集体带结构  

Collective Band Structures in Neutron-Rich Odd-A ^(145,147) Ce Nuclei

作　　者：M.萨哈伊 朱胜江[1] 甘翠云[1] 朱凌燕[1] 杨利明[1] 许瑞清[1] 全明吉 姜卓[1] 张征[1] J. H. Hamilton A. V. Ramayya B. R. S. Babu J. K. Hwang W. C. Ma J. Komicki J. D. Cole R. Aryaeinejad M. W. Drigert J. O. Rasmussen M. A. Stoyer S. Y. Chu K E. Gregorich M. F. Mohar S. G. Prussi 

机构地区：[1]清华大学物理系,北京100084 [2]Department of Physics Vanderbilt University [3]Department of Physics Mississippi State University [4]IdahoNationalEngineering Laboratory [5]Lawrence Berkeley Laboratory [6]Joint Institute for Nuclear Research

出　　处：《高能物理与核物理》2000年第11期1018-1023,共6页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金!(19775026);核工业科学基金!(Y7197AY509);美国能源部!(DE-FG05-88ER404

摘　　要：通过对２５２Ｃｆ自发裂变产生的瞬发γ谱的测量，对丰中子奇Ａ核１４５，１４７Ｃｅ的高自旋态进行了研究，首次识别了１４５Ｃｅ的集体带结构，扩展了１４７Ｃｅ的集体带结构，扩展了１４７Ｃｅ的能级，并新识别了３个边带，粒子－转子模型的计算指出，１４５，１４７Ｃｅ的晕带可能来自于νｉ１３／２轨道的耦合，１４５Ｃｅ基态起源于（νｈ９／２νｆ７／２）组态混合，而１４７Ｃｅ基态则起源于νｈ９／２轨道．在这两个核中未观测到明显的八极形变带，然而，在１４７Ｃｅ中观测到的一个边带，可能显露出八极关联的迹象．Through study of the prompt r-rays emitted in the spontaneous fission of 252Cf, high spin states of neutron-rich odd-A 145,147 Ce nuclei have been investigated. The levels in 147Ce have been extended. A collective band in 145Ce have been identified for the first time. The results from the particle rotor model calculations indicate that the yrast bands in 145Ce and 147Ce originate from vi13/2 orbital coupling and the ground states of 145Ce and 147Ce originate from (vh,9/2,vf7/2, ) and vh9/2 configiration, respectively. No obvious octupole deformation was observed in these two isotopes, but a side band obtained in 147Ce may show some octupole correlations.

关 键 词：核结构 集体带结构 丰中子奇A核 铈 

分 类 号：O571[理学—粒子物理与原子核物理]