Fission Time Scales and Distributions Studied Using a Langevin Dynamical Model
Abstract
The fission time scale and associated distributions play a crucial role in investigating the full dynamical evolution of the excited compound nucleus. In the present work, we have performed a one-dimensional Langevin dynamical model calculation to simulate the fission time scale and corresponding fission time distributions (FTDs) for ¹²⁵Cs, 213Fr, and 243Am. The time evolution of the collective deformation coordinate from the ground state to scission is followed under the influence of dissipation, fluctuations, and realistic fission barriers, and a large ensemble of trajectories is used to construct fission–time distributions for each compound nucleus. The results reveal distinct differences in the shapes and widths of the distributions, characterized by extended long-time components that significantly impact the average fission time. Particle evaporation is found to play an important role in shaping the fission time distributions by modifying the excitation energy during the dynamical evolution. These findings emphasize the importance of analyzing the full fission time distribution, rather than relying solely on average values, for a realistic description of fission dynamics.
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