输运理论中原子核初始化研究

基于同位旋相关的量子分子动力学(IQMD)输运理论模型,研究中能重离子碰撞的初始化问题。成功的初始化可以很好地减少碰撞过程中出现的非物理涨落和虚粒子发射,有利于两体碰撞过程顺利进行。计算发现,不同的对称势对原子核的稳定性有一定的影响。选取不同质量数的Fe,Kr,Sn元素及其同位素,通过其在自身平均场中随时间的演化来验证原子核的稳定性,统计出初始化稳定原子核的数量,选取出最为稳定的对称势。发现平方项的对称势U₂最为稳定,其对应的斜率L、不可压缩系数K_sym都在已知的约束范围内,表现出同位旋相关平均场取硬势时,原子核更为稳定的特征。

Effect of aging systems on mechanical properties of high strength thin wall 6XXX series aluminum alloy

Based on the isospin quantum molecular dynamics (IQMD) transport theory model, the initialization of intermediate energy heavy ion collisions was studied. The non-physical fluctuation and the emission of virtual particles in the collision process can be reduced by successful initialization, which is conducive to the stability of the next two-body collision. Different symmetry potentials have certain influence on the stability of nuclei. Fe, Kr, Sn and their isotopes with different mass numbers were selected, and the stability of nuclei was verified by the evolution with time in their own mean field. The number of stable nuclei was initialized statistically, and the most stable symmetry potential was selected. The study shows that the symmetry potential U₂ of the square term is the most stable, and its corresponding slope L and incompressible coefficient K_sym are all within the known constraint range. When the isospin dependent mean field takes the hard potential, the nucleus is more stable.