DYNAMICAL STUDY OF FISSION PROCESS AND ESTIMATION OF PRESCISSION NEUTRON MULTIPLICITY

The dynamics of fission has been studied by solving Euler-Lagrange equ ations with dissipation generated through one-and two-body nuclear fri ction. The average kinetic energies of the fission fragments, presciss ion neutron multiplicities, and the mean energies of the prescission n eutrons have been calculated and compared with experimental values and they agree quite well. A single value of friction coefficient has bee n used to reproduce the experimental data for both symmetric and asymm etric splitting of the fissioning systems over a wide range of masses and excitation energies. It has been observed that a stronger friction is required in the saddle to scission region as compared to that in t he ground state to saddle region. [S0556-2813(98)03805-9].