Two-Stage Model for Fast Particle Emission in Heavy-Ion Collisions

摘要

Using Bertsch's trajectory model two physically distinct approaches is applied to describe fast particle emission in heavy-ion collisions. In the early stage particle emission in the spirit of the Fermi-jet mechanism is calculated. In the later stage, after neck formation, particles are assumed to be emitted from a rapidly expanding hot zone of appreciably large initial dimension, which is strongly anisotropic in momentum space. Absolute double-differential cross sections for preequilibrium neutron emission and obtain a remarkable agreement with experimental data without introducing free parameters are calculated. 53 refs.; 13 figs. (Atomindex citation 17:085922)