Fragment emission in high-energy heavy-ion reactions

Abstract

We present a theoretical description of nuclear collisions which consists of a three-dimensional fluid-dynamical model, a chemical equilibrium breakup calculation for local light fragment (i.e., p, n, d, t, $^{3}\mathrm{He}$, and $^{4}\mathrm{He}$) production, and a final thermal evaporation of these particles. The light fragment cross sections and some properties of the heavy target residues are calculated for the asymmetric system Ne+U at 400 MeV/N. The results of the model calculations are compared with recent experimental data. Several observable signatures of the collective hydrodynamical processes are consistent with the present data. An event-by-event analysis of the flow patterns of the various clusters is proposed which can yield deeper insight into the collision dynamics.NUCLEAR REACTIONS Relativistic heavy-ion reactions, hydrodynamic description, nucleon and nuclear cross sections.