Calculation of the kinetic-energy distributions of fission-fragments from Monte-Carlo simulation to the four-dimensional Langevin equation

The four-dimensional Langevin equation for two collective coordinates (the distance between the centers of mass of the descent fragments and the neck parameter) and their conjugate momenta is used as a dynamical equation to describe the descent of Brownian particles from the saddle-point to the scission points. Monte-carlo method is used to solve the Langevin equation. The variances of the kinetic-energy distributions of nuclear fission-fragments in the range 32<Z2/A<40 have been calculated. The results of calculation are in good agreement with the experimental data