DYNAMICAL ASPECTS OF PARTICLE-EMISSION IN BINARY DISSIPATIVE COLLISIONS - EFFECTS ON HOT-NUCLEI FORMATION

Characteristics of charged-particle emission in heavy-ion reactions ha ve been studied in the framework of the semiclassical Landau-Vlasov ap proach for the Ar-40 + Al-27 collisions at 65 MeV/nucleon. At all impa ct parameters, the reaction mechanism is dominated by binary dissipati ve collisions. After an abundant prompt emission coming from the overl apping region between the target and the projectile, two excited nucle i, the quasitarget and the quasiprojectile, emerge from the collision. To shed some light on the role played by dynamical effects, light cha rged-particle observables, which are currently used as an experimental signature of a hot equilibrated nucleus, have been carefully investig ated. The model calculations show that binary dissipative collisions a re closely related to the so-called participant-spectator scenario in which the ''spectators,'' identified as the quasitarget and the quasip rojectile, are not very hot.