NUCLEAR-SURFACE, MEAN-FIELD AND ISOSPIN EFFECTS IN BOLTZMANN MASTER EQUATION THEORY OF PREEQUILIBRIUM REACTIONS

Pre-equilibrium emission of nucleons and light charged particles is in vestigated in central collisions leading to the complete fusion of two heavy ions, within the Boltzmann master equation approach. Realistic nucleon momentum density distributions for both projectile and target nuclei are used and mean field effects are schematically introduced in the early stage of the reaction process. The isospin dependence of th e calculation parameters is also discussed. Theoretical predictions of the spectra of the particles emitted both in symmetric and asymmetric interactions at incident energies of a few ten MeV/nucleon are in sat isfactory agreement with the experimental findings.