放射性核引起核反应的同位旋动力学与核温度的同位旋效应

本项目旨在结合国际和国内逐渐开展的放射性核束实验，对放射性核引起核反应的动力学和非对称核物质的液气相变等问题展开研究。将研究费米能区缺中子弹核轰击丰中子靶核的动力学过程，比较各个发射角度的碎片同位素成分，通过弹核靶核的作用时间来提取同位旋平衡时间。在此基础上，从中心碰撞到周边碰撞，研究颈部碎裂区的形成机制与同位旋成分，利用同位旋扩散特性提取低密度区对称能的特性。将详细区分热动能，费米动能，库库仑排斥能，反冲能和集体动能，基于量子Fermi-Dirac动力学近似，提出使用碎片的动能性质提取热力学温度的方案。使用双同位素产额比温度计、同重元素产额温度计、量子斜率温度计和量子涨落温度计等多种温度计，研究碎裂反应中的核温度。通过改变碰撞系统的质量数和中子质子比，探索同位旋自由度对动力学过程的影响，比较不同的核温度计，揭示核温度的同位旋效应。

Following with the experiments by the radioactive nuclear beam facilities all over the world, this project aim to investigate the reaction dynamics with radioactive nuclei and the liquid–gas phase transition in the asymmetric nuclear matter. The project will probe the isospin-dependent reaction mechanisms of the nuclear reactions with radioactive nuclei in the Fermi energy domain. The time for isospin equilibration will be extracted from angular distribution of isotopes and the interaction time between the projectile and target. By exploring the mechanisms responsible for the formation of neck source and the isospin diffusion, the information on the nucleon-nucleon interaction and nuclear equation of state will be provided. The distribution of the dissipated energy in each degree of freedom and the thermal properties of the fragmenting source will be researched, devoting to propose nuclear thermal temperature measurement schemes based on the Fermi-Dirac kinetic approaches. The nuclear temperature and its isospin effects will be studied by the double rations of isotopic yields, the isobaric yields from a given source, the quadrupole fluctuations of the fragments, and the quantum slope thermometer.