^(169)Re的转动带结构组态相关性研究(英文)  

Configuration-Dependent Bands in ~169Re

作　　者：周小红[1] M. Oshima 许甫荣[3] Y. Toh 张玉虎[1] 郑勇[1] M. Koizumi A. Osa T. Hayakawa Y. Hatsukawa T. Shizuma M. Sugawara 

机构地区：[1]中国科学院近代物理研究所,兰州730000 [2]Japan [3]北京大学技术物理系和MOE重点实验室,北京100871 [4]Chiba

出　　处：《高能物理与核物理》2003年第11期984-989,共6页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金(10005012);国家重点基础研究发展规划项目(TG20000774002)~~

摘　　要：研究了^(169)Re的高自旋态能级结构,建立了组态为π9/2^-[514]的强耦合带和组态为π1/2^-[541]的退耦合带,推转壳模型(Cranked shell model)计算结果表明组态相关的不同形变能够解释这些转动带的不同带交叉频率,在已知的奇ARe核中,^(169)Re的9/2^-[514]转动带在低自旋时具有最大的能量旋称劈裂,当一对i_(13/2)中子顺排后,旋称劈裂发生了反转,并且劈裂的幅度非常显著地减少了,另外,还观测到了一个三准粒子激发带,并指定了它的最可能组态为π9/2^-[514](?)νAE。High-spin states in 169 Re were studied and resulted in the identification of a strongly coupled band based on the 9/2-[514] Nilsson state and a decoupled band built on the h9/2 intruder proton orbital (nominally 1/2- [541]). The cranked shell nodel calculations present configuration-dependent deformations that can explain the different band crossing frecpiencies. The experimental 9/2- [514] band in Re shows the largest signature splitting at low spin among the known odd mass Re isotopes. After the alignment of a pair of the i 13/2 neutrons, the phase of the splitting is inverted with a significantly reduced amplitude. Additionally, a three-quasipariticle band was observed and assigned to be built likely on the π9/2-[514] (?) AE configuration.

关 键 词：^169Re 高自旋态 能级结构 转动带 结构 组态相关性 强耦合带 推转壳模型 铼原子核 

分 类 号：O572.2[理学—粒子物理与原子核物理]