Sep 4 – 9, 2022
Europe/Zurich timezone

The impacts of dynamical nuclear fission for neutron-rich actinoids on r-process nucleosynthesis

Sep 6, 2022, 6:00 PM
61/1-201 - Pas perdus - Not a meeting room - (CERN)

61/1-201 - Pas perdus - Not a meeting room -


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Nobuya Nishimura (RIKEN)


The nuclear fission of very neuron-rich nuclei is essential in the r-process for the termination of nucleosynthesis flows and the final abundances. Nevertheless, most of the available fission data for the r-process simulations are based on phenomenological calculations. In the present study, we investigate the theoretical uncertainty of nuclear fission related to the r-process. Focusing on the dynamical process in fission, we focus on the impacts of fission-fragment distribution on the r-process. We calculate a series of nuclear fission distribution for the neutron-rich isotopes of U to Fe away from the $\beta$-stability line with a dynamical fission model with the Langevin method. As the isotope becomes more neutron-rich, the asymmetric feature in fission distribution changes to the symmetric, which is significantly different from the results of the phenomenological model. We find the difference in fission yields show the impacts on the r-process final abundances around the second peak.

Primary authors

Nobuya Nishimura (RIKEN) Shoya Tanaka (RIKEN Nishina Center for Accelerator-Based Science) Itoshi Nishimura (Kindai University) Wataru Miyasakai Shinya Takagi (Kindai University) Yoshihiro Aritomo Masahisa Ohta

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