DYNAMICAL AND STATISTICAL ASPECTS IN NUCLEUS-NUCLEUS COLLISIONS AROUND THE FERMI ENERGY

This contribution is devoted to two important aspects of intermediate energy nucleus-nucleus collisions: the competition of dynamical and st atistical features, and the origin of the multifragmentation process. These two questions are discussed in focusing on Indra data. It turns out that most of collisions are binary and reminiscent of deep inelast ic collisions observed at lo iv energy. However, intermediate velocity emission is a clear signature of dynamical emission and establishes a link with the participant-spectator picture which applies at high bom barding energies. Multifragmentation is observed when the dissipated e nergy is large and it turns out that expansion occurs at least for cen tral collisions, as it is expected if this phenomenum has a dynamical origin.