锕系变形核转动惯量及奇偶差随角频率变化的微观机制

Microscopic Mechanism of Moments of Inertia and Odd-even Differences for Well-Deformed Actinide Nuclei

用处理对力的粒子数守恒方法分析了锕系变形核转动惯量及其奇偶差随角频率ω变化的微观机制 .建立在高j闯入轨道上的奇A核转动带 ,如 2 3 5U(ν[74 3]7 2 )带的转动惯量 ,比相邻偶偶核基态带大得多 ,而且 ,随ω变化的规律也呈现明显的奇偶差 .这些规律在粒子数守恒计算中得到很好地重现 .计算中无自由参数 。

The microscopic mechanism of the variation with rotational frequency of moments of inertia and their odd-even differences for well-deformed actinide nuclei are analyzed by using the particle-number conserving (PNC) method for treating nuclear pairing interaction. The moments of inertia for bands building on high j intruder orbitals in odd-A nuclei, e.g., the 235U (ν[743]7/2) band, are found to be much larger than those of ground-state bands in neighboring even-even nuclei. Moreover, there exist large odd-even differences in the ω variation of moments of inertia. All these experimental odd-even differences are reproduced quite well in the PNC calculation, in which the effective monopole and quadrupole pairing interaction strengths are determined by the experimental odd-even differences in binding energies and bandhead moments of inertia, and no free parameter is involved in the PNC calculation.