New multi-phonon gamma vibrational bands in A～110 neutron-rich nuclei  

作　　者：HAMILTON J H RAMAYYA A V RASMUSSEN J O HWANG J K YEOH E Y 

机构地区：[1]Department of Physics, Vanderbilt University, Nashville TN 37235, USA [2]Lawrence Berkeley National Laboratory, Berkeley CA 94720, USA [3]Department of Physics, Tsinghua University, Beijing 100084, China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2011年第S1期44-48,共5页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the Major State Basic Research Development Program (Grant No. 2007CB815005);the National Natural Science Foundation of China (Grant No. 10775078);supported by U. S. Department of Energy (Grant Nos. DE-FG05-88ER40407 and DEAC03-76SF00098)

摘　　要：The high spin states of neutron-rich 103Nb, 107Tc and 109Tc nuclei in A^110 region have been investigated by measuring prompt γ-γ-γ coincident measurements populated with the spontaneous fission of 252Cf with the Gammasphere detector array. In 103Nb, one-phonon K = 9/2 and two-phonon K = 13/2 γ-vibrational bands have been identified. In 107Tc and 109Tc, one-phonon K = 11/2 and two-phonon K = 15/2 γ-vibrational bands, in which the zero-phonon bands are based on K=7/2 excited states, have also been identified. The two-phonon bands are first observed in odd-Z nuclei. The characteristics for these band structures have been discussed.The high spin states of neutron-rich 103Nb, 107Tc and 109Tc nuclei in A^110 region have been investigated by measuring prompt γ-γ-γ coincident measurements populated with the spontaneous fission of 252Cf with the Gammasphere detector array. In 103Nb, one-phonon K = 9/2 and two-phonon K = 13/2 γ-vibrational bands have been identified. In 107Tc and 109Tc, one-phonon K = 11/2 and two-phonon K = 15/2 γ-vibrational bands, in which the zero-phonon bands are based on K=7/2 excited states, have also been identified. The two-phonon bands are first observed in odd-Z nuclei. The characteristics for these band structures have been discussed.

关 键 词：high spin states NEUTRON-RICH NUCLEUS γ-vibrational BANDS 

分 类 号：O571.5[理学—粒子物理与原子核物理]