[3E01-06] Nuclear Fission

[3E06] Study of fission dynamics using five-dimensional Cassini parameters in actinide region II

*Kazuki Okada¹, Takahiro Wada¹, Nicolae Carjan^2,3 (1. Kansai Univ., 2. IFIN-HH, 3. LP2i, Bordeaux Univ.)

Keywords:fission dynamics, Langevin equation, nuclear data, Cassini shape parameterization

The dynamical approach to fission with the multi-dimensional Langevin equation has been widely used in the study of fission. We apply the Cassini shape parametrization to the Langevin equation, which can flexibly describe the deformed shapes of nuclei. From the static approach, it has been pointed out that it is important to include five Cassini parameters to describe the fragment shapes: overall elongation, mass asymmetry, quadrupole deformation of fragments, shape asymmetry and octupole deformation of fragments. In this study, we apply the five-dimensional (5D) Langevin equation with the Cassini parameters in the actinide region.
At the 2022 Annual meeting, we showed the first results of the fragment mass distributions for the fission of U and Fm with 5D Langevin calculations. In this presentation, we report further results of fragment mass and total kinetic energy distributions for various actinide nuclei. In particular, we focus on Th, where the characteristics of fission change drastically with neutron number. We discuss the effectiveness of the 5D Langevin calculation with Cassini parameters by comparing the results with experimental data.