A～190区偶偶超变形带转动惯量变化的微观机制

用处理对力的粒子数守恒方法分析了A～ 190区偶偶核系列晕SD带的转动惯量 (动力学转动惯量J(2 ) 与运动学转动惯量J(1) )ω随角频率变化的规律。实验结果在计算中得到较好的重现。粒子数守恒计算中极清楚地展现了J(2 ) 随ω变化的微观机制 (可分别给出各大壳、各推转Nilsson能级上的粒子填布几率和对J(2 ) 的贡献 )。J(2 ) 随ω的变化是壳效应 (变形场中单粒子运动 )、对关联、Pauli堵塞效应以及Coriolis(反配对 )作用等相互竞争的结果。J(2 ) 的上升 ,主要来自高N闯入壳 (中子N =7,质子N =6 )的贡献。

Microscopic mechanism of the ωvariation in moments of inertia for vrast SD bands in the A ～ 190 region

The variation in moments of inertia (J (2) and J (1 ) ) with rotational frequency for the yrast SD bands of even-even nuclei , in A～190 region, is investigated by using the particle-number conserving met h od for treating the pairing interaction (monopole and quadrupole). The observed ω variations of J (2) andJ (1) are reproduced quite well in the PNC calculation. The microscopic mechanism of the ω variation of J (2) is clearly exhibited in the PNC calculation (the contributions to J (2) from variou s major shells and each individual cranked Nilsson orbital, the occupation proba bility of individual cranked Nilsson orbital, etc). The ω variati on of the moment of inertia is the result of the competition among the shell eff ect (single particle motion in a deformed potential), pairing correlation, Pauli blocking effect and Coriolis (anti-pairing) interaction. It is found that the smooth rise of J (2) withωis mainly attributed to the contribution from the intruder orbitals (neutron N=7 and proton N=6)