Abstract
A detailed model for prompt, fast nucleon (preequilibrium) nucleon emission is developed and analyzed. The basic scattering behavior in the early stages of the collision is described by a classical trajectory calculation, with particle emission arising from a zero-temperature, Fermi-gas approximation. The emission of a nucleon which has a velocity component normal to the reaction plane is taken into account in the formalism. The refraction of the nucleon trajectories passing through the mean field is studied and different prescriptions for the absorption of nucleons are carefully investigated. The method is applied to the reaction 16O + 93Nb at E Lab = 204 MeV, and various comparisons are made with particle emission occurring in a recent TDHF study. The calculated multiplicity is greatest for head-on collisions. In addition, inclusive and in-plane energy spectra and angular distrubitions are presented. The emission of forward-moving nucleons from the projectile (which pass through the target) takes place predominantly in the reaction plane and the angular distribution is strongly peaked, approximately in the forward direction, with the energy spectrum centered about the beam energy per nucleon.
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