Solidarity of signal of measures for the liquid-gas phase transition in the statistical multifragmentation model
Solidarity of signal of measures for the liquid-gas phase transition in the statistical multifragmentation model
复制标题
统计多碎裂模型中液-气相变测量信号的一致性
DOI：
10.1103/physrevc.99.054616
复制
发表时间：
2019
影响因子：
3.1
通讯作者：
Wada R
中科院分区：
文献类型：
--
作者：
Lin W;Ren P;Zheng H;Liu X;Huan M;Yang K;Qu G;Wada R
在统计多重碎裂模型(SMM)的框架下，系统地研究了系统的尺寸、不对称性和碎裂体积效应以及库仑效应对核液-气相变实验测量和相变机制的影响。这里所测量的是热曲线、比热容()、多重数导数()、力矩参数(和)、最大碎片电荷数的起伏(NVZ)、费雪指数()和齐夫定律参数()。观察到所有测量的一阶相变信号。对于热量曲线，在尺寸较小、丰中子较多或碎裂体积较小的系统中观察到较强的信号。相变温度与体系的尺寸、不对称性、碎裂体积和库仑力无关，这表明这些测量为SMM中的液气相变提供了一个固体信号。另一方面，其他体系的相变温度及其行为与体系的大小、不对称性和体积略有关系。对于没有库仑力的100的系统，观察到负热容量，但随着库仑力的增加，负热容量消失。观察到的一级相变的电荷分布给出了一幅有指导意义的图示。
A systematic study of system size,asymmetry, and fragmenting volume effects as well as the Coulomb effect on experimental measures for the nuclear liquid-gas phase transition and the mechanism of phase transition are carried out in the framework of the statistical multifragmentation model (SMM). The measures examined here are the caloric curve, the specific heat capacity (), the multiplicity derivative (), the moment parameters (and), the fluctuation of maximum fragment charge number (NVZ), the Fisher exponent (), and the Zipf's law parameter (). A signal for the first-order phase transition for all the measures is observed. A stronger signal is observed in the system with smaller sizes or with more neutron rich or in smaller fragmenting volumes for the caloric curve,, and. The phase-transition temperatures are independent of the system size,asymmetry, fragmenting volume, and Coulomb force, which indicates these measures give a solid signal for the liquid-gas phase transition in SMM. On the other hand, the phase transition temperature and its behavior of the others slightly depend on the size, theasymmetry and the volume of the system. A negative heat capacity is observed for systems with100 without the Coulomb force but disappears with the Coulomb. An instructive picture is given in the charge distributions for the observed first-order phase transition.