engleski

Dynamical aspects of particle emission in binary dissipative collisions - effects on hot-nuclei formation

Characteristics of charged-particle emission in heavy-ion reactions have been studied in the framework of the semiclassical Landau-Vlasov approach for the Ar-40 + Al-27 collisions at 65 MeV/nucleon. At all impact parameters, the reaction mechanism is dominated by binary dissipative collisions. After an abundant prompt emission coming from the overlapping region between the target and the projectile, two excited nuclei, the quasitarget and the quasiprojectile, emerge from the collision. To shed some light on the role played by dynamical effects, light charged-particle observables, which are currently used as an experimental signature of a hot equilibrated nucleus, have been carefully investigated. The model calculations show that binary dissipative collisions are closely related to the so-called participant-spectator scenario in which the ""spectators, "" identified as the quasitarget and the quasiprojectile, are not very hot.

Intermediate-mass fragments; Heavy-ion collisions; Impact parameter; Charged-particles; Violent collisions; E/A=27 MeV; 85 MeV/u; Flow

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