engleski

Towards a better understanding of dynamics in nuclear reactions below 100 MeV/nucleon

Features of emitted charged particles in heavy ion reactions have been studied in the framework of the semi-classical Landau-Vlasov approach for the light system Ar+Al at 65 MeV/nucleon incident energy. Most of the recent experimental results suggest the binary nature of the reaction mechanicsm over a large impact parameter range. We draw the same conclusion from our simulation. Contrary to the expections that at these energies a mechanism reminiscent of low energy deep-inelastic reaction could create two very excited sources (the primary quasiprojectile and quasitarget), the model calculation shows that this reaction mechanism is closely connected to the participant-spectator picture. In such scenario, the primary quasiprojectile and quasitarget can be identified as not very hot spectators. This stems from an abundant dynamical (participant) emission centered at mid-rapidity but covering all the rapidity range accessible to the collision and coming from the overlapping, i.e. participant zone of both incoming nuclei. Owing to Coulomb interaction with the quasiprojectile and the quasitarget, these participant particles behave as evaporated particles. From an experimental point of view, it is thus a real challenge to disentangle between dynamical and thermodynamical components.

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