GANES: A computer program for the simulation of laboratory spectra of evaporative light particles in heavy ion reactions

Abstract

A computer program called GANES has been written to simulate the evaporation of light particles in heavy ion reactions. The program uses the very efficient “weighted Monte Carlo” method. GANES has been designed to treat two-body breakup reactions such as fusion fission and three-body breakup reactions such as sequential fission (of a heavy product) after a primary inelastic collision. GANES calculates energy spectra for light particles evaporated from a composite nucleus before scission, and also from fully accelerated fragments after scission. Mass, energy and angular distributions of the heavy fragments are taken into account. Energy spectra (inclusive and exclusive) of the evaporated particles are calculated by a semiclassical formulation for detectors of finite size at a number of laboratory directions, both in and out of the reaction plane. Detector thresholds and various coincidence gates are also considered. GANES has been used to identify the emission sources of evaporative particles and to determine their multiplicities. It has also been used to study the thermodynamic properties of the emitters, such as effective emission barrier, temperature, moment of inertia and root-mean-square spin.