Energy and pairing dependence of dissipation in real-time fission dynamics
Energy and pairing dependence of dissipation in real-time fission dynamics
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DOI：
10.1103/physrevc.104.054604
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发表时间：
2021-08
影响因子：
3.1
通讯作者：
Yuanbao Qiang;J. Pei
中科院分区：
文献类型：
--
作者：
Yuanbao Qiang;J. Pei
利用含时Hartree-Fock+BCS方法，从能量依赖和对依赖两个方面对裂变动力学演化中的耗散进行了微观研究.通过将Fm的对称裂变过程映射到经典的运动方程中，得到了摩擦系数和耗散能。密度约束计算用于获得动力学势。得到的摩擦系数对变形有很强的依赖性，并且与统计模型中采用的摩擦系数平均匹配。耗散确实随着初始激发能的增加或配对的减少而增加。它也表明，断后耗散起着重要的作用。所展示的耗散特性对各种裂变模型的刻度都是有价值的。
This work presents a microscopic study of dissipation in fission dynamical evolutions with the timedependent Hartree-Fock+BCS method in terms of energy dependence and pairing dependence. The friction coefficients and dissipation energies are extracted by mapping the symmetric fission process of Fm into a classical equation of motion. Density-constrained calculations are used to obtain the dynamical potential. The obtained friction coefficients have a strong dependence of deformations, and averagely match the coefficients adopted in statistical models. The dissipation indeed increase with increasing initial excitation energies or with decreasing pairings. It is also shown that postscission dissipations play a significant role. The demonstrated characteristics of dissipations will be valuable for calibrations of various fission models.