Simultaneous mutiparticle emission from compound nuclei in evaporation process

Abstract

When a hot compound nucleus is formed as an intermediate state of a nuclear reaction, evaporation takes place. The conventional treatment for this process considers only single or sequential emission of particles. However, for very high excitation energy of the compound nucleus, other emission channels with several particles emitted simultaneously can be open. In the present work we introduce these channels in competition with the fission process in the decay chains of the compound hot nucleus formed in a spallation reaction. A Monte Carlo simulation is employed to determine the average yield of emitted particles along the decay chain. The neutron, proton, alpha and fission yields are obtained in the new version of the evaporation process and they are compared to yields of the conventional treatment with sequential single particle emission. The relevance of the different channels in competition is also shown.