PSEUDO-PARTICLE MODELS FOR NUCLEAR-REACTIONS WITH HEAVY-IONS

For ten years, the Boltzmann equation (with some modifications to take into account some quantum effects) has been the basis of models for t he description of heavy ion reactions; these models have the common fe ature that they simulate the Boltzmann equation (under various names a s: Landau-Vlasov, Boltzmann-Uehling-Uhlenbeck, Boltzmann-Nordheim...) rather than they solve it explicitly. This report presents the basic n umerical principles of the Boltzmann models in Heavy Ion Physics and t heir links with other modelizations of the N-Body Problem used in othe r fields of Physics. It discusses their validity and some applications arbitrarily chosen among the most relevant ones.