奇A Lu同位素负宇称Yrast带的研究

Study of the Negative-Parity Yrast States in Odd-A Lu-Isotopes

利用粒子一转子模型研究了奇Ａ Ｌｕ核负宇称Ｙｒａｓｔ态带交叉前后的能谱和跃迁几率，理论值和实验值符合得较好．研究表明，^(１６１，１６３，１６５，１６７)Ｌｕ负宇称Ｙｒａｓｔ态是三轴形变的；ａｂ公式正确地描述了带交前后核心的转动惯量随角动量Ｉ的变化．

Using Particle-Rotor Model, the energy spectra and electromagnetic transitions ofthe negative-parity yrast states, before and after the band-crossing in odd-A Lu isotopes, areinvestigated and compared with the experimental data. It is noted that before and after theband-crossing the moment of inertia of the core is a smooth function of the total angular mo- mentum I and can be described by the ah formula; The triaxial deformation before and afterthe band-crossing determined from the calculations is appreciably different for 161,163,165 Lu,while it is more or less similar for 167 Lu.