Abstract
Nuclear fission of superheavy elements can affect the r-process nucleosynthesis via a fission cycling process. In that process, the identification of the nuclide of a fission fragment and its abundance is essential for a precise evaluation of their contribution as seed nuclei of the r-process. We have investigated the nuclear fission of SHEs from the proton-rich side to the neutron-rich side using our three-and four-dimensional Langevin models [1, 4]. This model can reproduce the experimental data on nuclear fission of actinides and SHEs, while it can only provide various quantities to each fission fragment, we also developed a semi-empirical charge distribution model based on abundant experimental data of actinides [3]. A new semi-empirical nuclear fission model for the r-process is made by combining these two models.
Highlights
Background and Our ModelNuclear fission plays an essential role in the rapid neutron capture process (r-process) because it provides seed nuclei for the r-process
Our semi-empirical fission fragment model Y(Z, A) combines mass yield model Y(A) [2] and the charge distributions evaluated by thousands of experimental data of nuclear fission in actinides [3]
Our model provides a broader mass distribution with the fragment mass number A=90-165 than KodamaTakahashi, the standard mass model of the r-process nucleosynthesis
Summary
Nuclear fission plays an essential role in the rapid neutron capture process (r-process) because it provides seed nuclei for the r-process. After the first observation of the r-elements in neutron star mergers, the fission cycling process in the r-process attracts more attention for a more precise analysis of the r-process nucleosynthesis. Fission yields strongly depend on nuclear models.
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