Fission fragment distributions of neutron-rich nuclei based on Langevin calculations: toward r-process simulations

TL;DR

This paper presents Langevin-based dynamical fission calculations for neutron-rich nuclei relevant to the r-process, providing new fission distribution data to improve nucleosynthesis models.

Contribution

It introduces a theoretical approach to predict fission fragment distributions for neutron-rich nuclei, addressing the lack of experimental data.

Findings

Fission distributions for neutron-rich actinoids were calculated.

Theoretical results agree with available experimental data.

Systematic behavior of mass distributions for U and Fm isotopes was analyzed.

Abstract

The nuclear fission of very neuron-rich nuclei related to the r-process is essential for the termination of nucleosynthesis flows on the nuclear chart and the final abundances. Nevertheless, most of the available fission data for the r-process calculations are based on theory predictions, including phenomenological treatments. In this study, we calculated a series of nuclear fission distribution for neutron-rich nuclei away from the beta-stability line. As most of these nuclei are experimentally unknown, we are based on theoretical calculations based on the dynamical fission model with the Langevin method. We performed fission distribution calculations for neutron-rich actinoid nuclei, applicable to the r-process nucleosynthesis simulations. In the present paper, we compared the obtained mass and charge distributions with experimental data. We also show the results of the systematic behaviour of mass distribution for neutron-rich U and Fm isotopes.