Gamma Vibrational Bands and Chiral Doublet Bands in A≈100 Neutron-rich Nuclei  

作　　者：J.H.Hamilton A.V.Ramayya J.K.Hwang J.O.Rasmussen S.Frauendorf V.Dimitrov 

机构地区：[1]Department of Physics,Vanderbilt University [2]Lawrence Berkeley National Laboratory [3]Physics Department,Notre Dame University

出　　处：《原子核物理评论》2009年第S1期64-69,共6页Nuclear Physics Review

基　　金：National Natural Science Foundation of China(10575057,10775078);Major State Basic Research Development Program of China(2007CB815005);Special Program of Higher Education Science Foundation of China(20070003149);U.S. Department of Energy(DE-FG05-88ER40407,and DE-AC03-76SF00098)

摘　　要：The level structures of neutron-rich 105Mo,106Mo,108Mo and 110Ru nuclei in A ≈ 100 region have been carefully investigated by coincidence measurements of the prompt γ-rays populated in the spontaneous fission of 252Cf with the Gammasphere detector array. In 105Mo,one-phonon K=9/2 and two-phonon K=13/2 γ-vibrational bands have been identified. In 108Mo,one-phonon γ-vibrational band is expanded and two-phonon γ-vibrational band has been identified. Two similar sets of bands in 106Mo and 110Ru are observed to high spins,which have been proposed as the soft chiral γ-vibrational bands. The characteristics for these γ-vibrational bands and chiral doublet bands have been discussed.The level structures of neutron-rich 105Mo,106Mo,108Mo and 110Ru nuclei in A ≈ 100 region have been carefully investigated by coincidence measurements of the prompt γ-rays populated in the spontaneous fission of 252Cf with the Gammasphere detector array. In 105Mo,one-phonon K=9/2 and two-phonon K=13/2 γ-vibrational bands have been identified. In 108Mo,one-phonon γ-vibrational band is expanded and two-phonon γ-vibrational band has been identified. Two similar sets of bands in 106Mo and 110Ru are observed to high spins,which have been proposed as the soft chiral γ-vibrational bands. The characteristics for these γ-vibrational bands and chiral doublet bands have been discussed.

关 键 词：high spin state NEUTRON-RICH NUCLEUS γ-vibrational BAND CHIRAL DOUBLET BAND 

分 类 号：O571.21[理学—粒子物理与原子核物理]