High Spin States in Odd-Odd ^160Tm Nucleus  

作　　者：孙亮 陆景彬 杨东 王烈林 杨森 刘运祚 赵延新 周文平 马英君 竺礼华 吴晓光 李广生 

机构地区：[1]Physics College, Jilin University, Jilin Changchun 130023 [2]China Institute of Atomic Energy (CIAE), Beijing 102413

出　　处：《Chinese Physics Letters》2008年第6期1996-1999,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant No 10105003, the Specialized Research Fund for the Doctoral Programme of Higher Education of China under Grant No 20050183008, and the National Basic Research Programme of China under Grant No 2007CB815000.

摘　　要：High-spin states of ^160Tm are studied by the ^146 Nd（^19F, 5n） reaction at a beam energy of 102 MeV. The previously known πh11/2 ＋ vi13/2 yrast band and πh11/2 ＋ vh9/2 side band are confirmed. The level scheme is enriched and more low-lying levels are observed. A new side band is observed and assigned as the favoured signature partner of πd3/2 ＋ vi13/2. The spin of this band is assigned with the energy level systematics. It is pointed out that the B （M1）/B （E2） ratios increase rapidly at the high frequency approaching the second crossing in the π h11/2 ＋ vi13/2 braid, which is closely related to the alignment gain of the aligned i13/2 quasineutron.High-spin states of ^160Tm are studied by the ^146 Nd（^19F, 5n） reaction at a beam energy of 102 MeV. The previously known πh11/2 ＋ vi13/2 yrast band and πh11/2 ＋ vh9/2 side band are confirmed. The level scheme is enriched and more low-lying levels are observed. A new side band is observed and assigned as the favoured signature partner of πd3/2 ＋ vi13/2. The spin of this band is assigned with the energy level systematics. It is pointed out that the B （M1）/B （E2） ratios increase rapidly at the high frequency approaching the second crossing in the π h11/2 ＋ vi13/2 braid, which is closely related to the alignment gain of the aligned i13/2 quasineutron.

分 类 号：O571[理学—粒子物理与原子核物理]