^(190)Tl的πh_(9/2)νi_(13/2)扁椭球转动带的旋称反转研究(英文)  

Signature Inversion in the πh_(9/2) νi_(13/2) Oblate Band of ^(190)Tl 

作　　者：周小红[1] 谢成营[1] 张玉虎[1] 郭应祥[1] 雷相国[1] 郑勇[1] 柳敏良[1] 宋立涛[1] 王华磊[1] 于海萍[1] 骆鹏[1] 郭文涛[1] 竺礼华[2] 吴晓光[2] 

机构地区：[1]中国科学院近代物理研究所,兰州730000 [2]中国原子能科学研究院,北京102413

出　　处：《高能物理与核物理》2004年第10期1045-1049,共5页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金 (10 3 75 0 77;10 2 2 10 0 3 );国家重点基础研究发展规划项目 (TG2 0 0 0 0 7740 2 )资助~~

摘　　要：利用能量为 1 6 7— 1 75MeV的35Cl束流 ,通过16 0 Gd(35Cl,5n)熔合蒸发反应研究了190 Tl的高自旋态能级结构 .实验建立了190 Tl基于πh9/2 　 　νi13/2 组态的转动带 .在束测量结果和194 Biα衰变的α γ测量结果确定地指定了190 Tl的πh9/2 　 　νi13/2 转动带的自旋值 .基于自旋指定 ,发现了190 Tl的πh9/2 　 　νi13/2 扁椭球转动带在低自旋时旋称反转 .这是首次在基于πh9/2 　 　νi13/2 组态的扁椭球转动带中观测到旋称反转 .考虑了质子 -中子剩余相互作用的粒子 -转子模型能够解释πh9/2 　 　νi13/2 扁椭球转动带的低自旋旋称反转 .High spin states in 190 Tl have been studied experimentally using the 160 Gd( 35 Cl, 5n) fusion evaporation reaction at beam energies of 167—175 MeV. A rotational band built on the π h 9/2  ν i 13/2 configuration with oblate deformation has been established. Spin values have been firmly assigned to the π h 9/2  ν i 13/2 oblate band by combining the present in beam experimental results with the complementary α γ correlation measurements of 194 Bi α decay. With the configuration and spin parity assignments, the low spin signature inversion has been revealed for the π h 9/2  ν i 13/2 oblate band. It is the first experimental observation of low spin signature inversion for a band associated with the oblate π h 9/2  ν i 13/2 configuration. The low spin signature inversion could be interpreted in the framework of the quasiparticles plus rotor model including a J dependent proton neutron residual interaction.

关 键 词：转动带 旋称反转 椭球 自旋指定 能级结构 高自旋态 Α衰变 首次 实验 反应 

分 类 号：O562.2[理学—原子与分子物理]