锕系核四准粒子激发带性质的研究

Research on the Properties of Four-quasi-particle Excitation Bands

利用锕系偶偶核及与其紧邻的奇Ａ核转动谱，计算了锕系偶偶核基带及与其紧邻的奇Ａ核基态的转动惯量。结果表明，转动惯量存在系统的奇偶差。讨论了这种奇偶差存在的原因。并通过计算锕系偶偶核两准粒子和四准粒子激发带的转动惯量比值Ｒｅｘｐ，详细分析了造成准粒子激发带转动惯量之间关系Ｒ的实验值与理论预言值不符的原因，并探讨了有关物理机制，进而揭示堵塞效应的重要影响及ＢＣＳ理论的局限性。

The moment of inertia of quasi-particle are systematically caculated by using the experimental data of rotational bands in Actinide even-even region(A≥221) and odd-A nuclei near to it. The odd-even differences of moment of inertia are discussed. The reason of disagreement between Rexp and Rtheo of two-quasi-particle and four-quasi-particle are analyzed in detail (here R refers to the relations among the moments of inertia of quasi-particle excitation bands) and some physicle mechanism is discussed. Accordingly, the serious blocking effect and limits of BCS theoroy any revealed.