The evaluation of the fission mode and fragment yields of neutron-rich nuclei by the dynamical model
The evaluation of the fission mode and fragment yields of neutron-rich nuclei by the dynamical model
复制标题
动力学模型评价富中子核裂变模式和碎片产率
DOI：
10.1051/epjconf/202327911021
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发表时间：
2023
影响因子：
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通讯作者：
Aritomo Yoshihiro
中科院分区：
文献类型：
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作者：
Tanaka Shoya;Nishimura Nobuya;Nishimura Itoshi;Aritomo Yoshihiro
通过快速中子捕获过程（r 过程）进行的核合成通过富中子核素产生比铁重的元素，在太阳系和具有各种金属丰度的恒星中观察到。在 r 过程中，裂变通过在中子辐照期间回收物质并塑造最终的 r 丰度分布发挥着重要作用。然而，由于实验方法的困难，大多数可用于r过程计算的裂变数据都是基于唯象模型的理论预测。在这项研究中，我们重点关注富中子同位素中裂变模式从不对称到对称的转变，这在最近的镄同位素实验中得到了证实。我们通过基于动力学模型的理论计算并采用朗之万方程研究了富中子核的裂变。
Nucleosynthesis by the rapid neutron-capture process (r-process) produces elements heavier than iron via neutron-rich nuclides, observed in the solar system and stars with various metallicities. In the r-process, fission plays a fundamental role by recycling the matter during neutron irradiation and by shaping the final r-abundance distribution. Nevertheless, due to the difficulty of experimental approaches, most of the fission data available for r-process calculations are based on theoretical predictions with phenomenological models. In this study, we focused on the transition of fission mode from asymmetric to symmetric in neutron-rich isotopes, which has been suggested in recent experiments for fermium isotopes. We investigated the fission of neutron-rich nuclei by a theoretical calculation based on the dynamical model and employed Langevin equations.