Dynamical approach to calculating angular distributions of fission fragments

A dynamical approach is proposed for calculating the angular distributions of fission fragments. The rt laxation time for the degree of freedom associ ated with the projection of the total angular momentum of the nuclear syste m onto the symmetry axis and the coefficient of damping of the fission mode are the basic parameters of this approach. Experimental data on the anisot ropy of the angular distributions of fission fragments and on the multiplic ities of prescission neutrons are analyzed within the proposed model for O- 16 + Pb-208 (E-lab = 110-148 MeV),O-16 + Th-232 (120-160 MeV), O-16 + Cm-24 8 (110-148 MeV), and O-16 + U-238 (96-148 MeV). The relaxation time and the damping coefficient are estimated at tau (K) = (5-6) x 10(-21) s and beta = 4 x 10(21) s(-1), respectively. (C) 2001 MAIK "Nauka/Interperiodica".