Properties of the 3/2^-[521] band in the odd-N rare-earth nuclei  

作　　者：CHEN Liang1,2, ZHOU XiaoHong1,2, ZHANG YuHu1, ZHANG ShuangQuan3 & ZHU LiHua4 1Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China 2Graduate University of Chinese Academy of Sciences, Beijing 100049, China 3State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China 4China Institute of Atomic Energy, Beijing 102413, China 

出　　处：《Science China(Physics,Mechanics & Astronomy)》2011年第S1期37-43,共7页中国科学：物理学、力学、天文学（英文版）

基　　金：supported bythe National Basic Research Program of China (Grant No. 2007CB815001);the National Natural Science Foundation of China (Grant Nos. 10825522,10735010 and 10575120);the Chinese Academy of Sciences

摘　　要：High-spin states in 161Er have been studied experimentally via the 150Nd(16O, 5n) reaction at a beam energy of 86 MeV. Three rotational bands built on the 5/2+[642], 3/2-[521], and 11/2-[505] configurations have been extended up to high-spin states, and particularly, the α = -1/2 branch of the ground state 3/2-[521] band has been revised significantly. It is found that signature inversion occurs in the 3/2-[521] band after the band crossing in 161Er. The systematics of the signature inversion associated with the 3/2-[521] configuration in the rare-earth region is discussed. The band properties are analyzed within the framework of a triaxial particle-rotor model, and a triaxial deformation is proposed to the 3/2-[521] band.High-spin states in 161Er have been studied experimentally via the 150Nd(16O, 5n) reaction at a beam energy of 86 MeV. Three rotational bands built on the 5/2+[642], 3/2-[521], and 11/2-[505] configurations have been extended up to high-spin states, and particularly, the α = -1/2 branch of the ground state 3/2-[521] band has been revised significantly. It is found that signature inversion occurs in the 3/2-[521] band after the band crossing in 161Er. The systematics of the signature inversion associated with the 3/2-[521] configuration in the rare-earth region is discussed. The band properties are analyzed within the framework of a triaxial particle-rotor model, and a triaxial deformation is proposed to the 3/2-[521] band.

关 键 词：HIGH-SPIN STATES SIGNATURE INVERSION TRIAXIAL particle-rotor model 

分 类 号：O571[理学—粒子物理与原子核物理]