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稀土区奇奇核πh1/2×vi13/2带B(M1)/B(E2)比值增强特性
引用本文:陆景彬,刘运祚,孙亮,杨东,梁国栋,王守宇,马英君,赵广义,李险峰,崔兴柱,李明非,霍俊德,曾国模,竺礼华,吴晓光.稀土区奇奇核πh1/2×vi13/2带B(M1)/B(E2)比值增强特性[J].原子核物理评论,2005,22(2):172-179.
作者姓名:陆景彬  刘运祚  孙亮  杨东  梁国栋  王守宇  马英君  赵广义  李险峰  崔兴柱  李明非  霍俊德  曾国模  竺礼华  吴晓光
作者单位:[1]吉林大学物理学院,吉林长春130023[2]中国原子能科学研究院,北京102413
基金项目:国家自然科学基金,国家重点基础研究发展计划(973计划)
摘    要:在稀土区奇奇核πh1/2×vi13/2转动带中,系统地观测到随转动频率或角动量增加,B(M1)/B(E2)曲线表现出所谓parabola-1ike形状,即在增加到某一转动频率或自旋后,B(M1)/B(E2)比值快速增强。基于推转模型和粒子转子模型关于奇奇核二准粒子转动带磁偶极约化跃迁几率的描述,对稀土区双奇核的这一行为进行了讨论。指出该现象的发生与vi13/2准中子转动顺排特性密切相关。B(M1)/B(E2)比值在接近第二带交叉(即BC准中子对顺排)的较高频率处的增强效果,可以理解为主要来源于带交叉引起的波函数中混合四准粒子成分的结果。通过对B(M1)/B(E2)比值的增强效果发生在较低频率处的分析,对稀土区奇奇核πh1/2×vi13/2带角动量耦合图像有了进一步认识。It is systematically observed that the B(M1)/B(E2) plots with the increasing of rotational frequency, behaves as a so called parabola like shape in the π h11/2 νi13/2 bands of rare earth doubly odd nuclei (i.e., the B(M1)/B(E2) ratios increase rapidly after a certain rotational frequency). Such a phenomenon is discussed based on the formula of magnetic dipole reduced transition probability deduced from the Cranking Shell Model and Particle Rotor Model respectively. It is pointed out that, the occurrence of this behavior is closely related to the alignment nature of the νi 13/2 quasineutron. The increasing of B(M1)/B(E2) occurring at large frequency approaching the second BC crossing can be understood as mainly resulted from the mixing of wave function with the 4 quasiparticle band caused by the band crossing. Insight into the angular momentum coupling scheme between the quasiparticles and collective core in the πh11/2 νi 13/2 structures of rare earth doubly odd nuclei is gained by analyzing the increasing behavior of B(M1)/B(E2) ratios occurring at low rotational frequency.

关 键 词:高自旋态    奇奇核    电磁跃迁特性    
收稿时间:1900-01-01

Increasing Property of B(M1)/B(E2) Ratios in πh11/2(×)νi13/2 Bands of Rare-earth Doubly Odd Nuclei
LU Jing-Bin,LIU Yun-Zuo,SUN Liang,YANG Dong,LIANG Guo-dong,WANG Shou-yu,MA Ying-yun,ZHAO Guang-yi,LI Xian-Feng,CUI Xing-zhu,LI Ming-Fei,HUO Jun-de,ZENG Guo-Mo,ZHU Li-hua,WU Xiao-guang.Increasing Property of B(M1)/B(E2) Ratios in πh11/2(×)νi13/2 Bands of Rare-earth Doubly Odd Nuclei[J].Nuclear Physics Review,2005,22(2):172-179.
Authors:LU Jing-Bin  LIU Yun-Zuo  SUN Liang  YANG Dong  LIANG Guo-dong  WANG Shou-yu  MA Ying-yun  ZHAO Guang-yi  LI Xian-Feng  CUI Xing-zhu  LI Ming-Fei  HUO Jun-de  ZENG Guo-Mo  ZHU Li-hua  WU Xiao-guang
Institution:1 Department of Physics, Jilin University, Changchun 130023, China 2 China Institute of Atomic Energy, Beijing 102413, China
Abstract:It is systematically observed that the B(M1)/B(E2) plots with the increasing of rotational frequency, behaves as a so called parabola like shape in the π h11/2 νi13/2 bands of rare earth doubly odd nuclei (i.e., the B(M1)/B(E2) ratios increase rapidly after a certain rotational frequency). Such a phenomenon is discussed based on the formula of magnetic dipole reduced transition probability deduced from the Cranking Shell Model and Particle Rotor Model respectively. It is pointed out that, the occurrence of this behavior is closely related to the alignment nature of the νi 13/2 quasineutron. The increasing of B(M1)/B(E2) occurring at large frequency approaching the second BC crossing can be understood as mainly resulted from the mixing of wave function with the 4 quasiparticle band caused by the band crossing. Insight into the angular momentum coupling scheme between the quasiparticles and collective core in the π h11/2 νi 13/2 structures of rare earth doubly odd nuclei is gained by analyzing the increasing behavior of B(M1)/B(E2) ratios occurring at low rotational frequency.
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