SYSTEMATIC STUDY OF FISSION FRAGMENT MASS DISTRIBUTION USING 2-DIMENSIONAL LANGEVIN DYNAMICS

摘要

The fragment mass distribution from fission of hot nuclei is studied in the framework of two-dimensional Langevin equations. First, the finite-range liquid drop model potential, collective inertia and one-body dissipation strength are calculated for different compound nuclei over a wide range of fissility parameter. Then, the mass asymmetry coordinate distribution is obtained from the dynamical calculation both at the saddle and the scission regions to explain the role of saddle-to-scission dynamics. Specifically, the competition between dissipative and conservative forces in determining the fragment mass distribution is investigated.