Signature splitting of the πh_(11/2) band and high-spin structures in ^(155)Tb  

作　　者：李涛 陈宝仁 刘树新 

机构地区：[1]School of Physics,Peking University [2]Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Collisions

出　　处：《Chinese Physics C》2010年第7期958-963,共6页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China (10675006)

摘　　要：Seven experimentally observed bands of 155Tb are analyzed in detail,using the particle-number-conserving method for treating the cranked shell model with monopole and quadrupole pairing interactions.We satisfactorily reproduce the experimental alignments and especially focus on the microscopic mechanism of the second back-bending and the influence of pair interaction on ultrahigh spins.Our calculated results show that the πi13/2 orbitals are too high to give a contribution to the moment of inertia below ω≈ 0.7 MeV.Instead,the crossing between the π[541]1/2 and other proton orbitals is responsible for the second back-bending.We assign a possible configuration to the decoupled band found in 155Tb and predict eleven bands which are experimentally unobserved.Seven experimentally observed bands of 155Tb are analyzed in detail,using the particle-number-conserving method for treating the cranked shell model with monopole and quadrupole pairing interactions.We satisfactorily reproduce the experimental alignments and especially focus on the microscopic mechanism of the second back-bending and the influence of pair interaction on ultrahigh spins.Our calculated results show that the πi13/2 orbitals are too high to give a contribution to the moment of inertia below ω≈ 0.7 MeV.Instead,the crossing between the π[541]1/2 and other proton orbitals is responsible for the second back-bending.We assign a possible configuration to the decoupled band found in 155Tb and predict eleven bands which are experimentally unobserved.

关 键 词：RARE-EARTH high-j intruder orbital alignment particle-number-conserving method back-bending 

分 类 号：O571.2[理学—粒子物理与原子核物理]