Signature splitting of the πh11/2 band and high-spin structures in 155Tb

• Published in: Chinese physics C Vol. 34; no. 7; pp. 958 - 963
• Main Author: 李涛 陈宝仁 刘树新
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.07.2010; School of Physics, Peking University, Beijing 100871, China%School of Physics, Peking University, Beijing 100871, China; Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Collisions, Lanzhou 730000, China
• Subjects: h11; 实验观察; 相互作用; 自旋结构; 计算结果; high-j intruder orbital; particle-number-conserving method; rare-earth; back-bending; alignment
• ISSN: 1674-1137; 0254-3052; 2058-6132
• DOI: 10.1088/1674-1137/34/7/006

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.