微观相互作用玻色子模型中热^(166,168,170)Er核比热容及其相变的数值研究

Specific Heat Capacity and Phase Transition on Hot ~166,168,170 Er Nuclei in Microscopic Interacting Boson Model

应用微观相互作用玻色子模型 ,制备了偶 16 6 ,16 8,170Er同位素的零温能谱 ,其值与最新的实验结果符合得比较好 ;采用正则系综理论 ,计算出核的有限温度比热容 .基于比热峰是相变信号和对序参量的分析 ,有可能统一描述核发生的热激发模式相变、核形状相变和从超流相到正常相相变 .

Using microscopic interacting boson model, the spectrum at zero temperature on 166,168,170 Er isotopes are successfully calculated, 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 and analyzing order parameter, it is by means of this approach that the phase transition of model thermo excited, one of the nuclear shape, and one from the superfluid nuclear phase to the normal phase taken place in nucleus may be described untidily.