[2N11-16] Nuclear Reaction Theory

[2N13] Excitation energy dependence of total kinetic energy of different fission modes by 4D Langevin model

*Kazuya Shimada¹, Chikako Ishizuka¹, Satoshi Chiba¹ (1. Tokyo Tech)

Keywords: Nuclear fission, Langevin model, Kinetic energy, Fission mode, Shell correction

Experimentally, it is known that TKE (total kinetic energy) decreases as the excitation energy increases. Fragments are classified as Super-long (SL) mode, which has symmetric fragments and small TKE, or Standard (ST) mode, which has asymmetric fragments and large TKE. Our research-based on the 4-dimensional Langevin model focused on fragments' deformation and revealed that the increase in the degree of the heavy fragments' deformation in ST mode contributed significantly to the decreasing TKE. This study investigated the background of the increase in the degree of fragment deformation with the increase in excitation energy. As a result, it was suggested that the shards lost the shell correction as the excitation energy increased and became closer to a liquid model.