微观核芯+两准粒子模型中热核148—158Sm的比热容及其相变

应用微观核芯+两准粒子模型制备偶148—158Sm同位素的零温度能谱, 其基态带、β带、γ带和部分高自旋态能谱值与最新实验结果符合得较好; 采用正则系综理论, 计算出核的有限温度比热容.基于比热容峰是相变信号，给出了统一描述核发生热激发模式相变、从核超流相到正常相相变和核形状相变的可能性.讨论了两准粒子顺排态能量和指认, 以及核形状的热稳定性.

Specific heat capacity and phase transition on 148-158Sm nuclei in microscopic core plus two-quasiparticle model

Using microscopic core plus two-quasiparticle model, the ground-band, β-band, γ-band and partial high spins states at zero temperature in even 148—158 Sm isotopes are successfully reproduced, these values are coincident with recent experimental one. Under canonical ensemble theory, their finite temperature specific heat capacity is calculated. Seeing that the peak of specific heat capacity is the signal of phase transition, it is by means of this approach that the phase transition of model thermo-excited, one from the superfluid nuclear phase to the normal phase, and one from the deformed shape to the spherical shape taken place in nuclei may be described untidily. The aligned energy and the identity of two-quasiparticle are discussed, and then the thermal stability of nuclear shape is investigated.