Multifragmentation in the intranuclear cascade ? percolation approach

Abstract

Results of intranuclear cascade calculations followed by a percolation procedure lead to an encouraging comparison with the experimental mass distributions observed in proton and heavy ion induced reactions in the intermediate energy domain. The predictive power of the model as well as its implications and limitations are examined. PACS: 25.70.Np

A new model for production of fast light clusters in spallation reactions

“…For spallation reactions in the energy range under consideration, it is very hard to couple nucleon degrees of freedom and cluster degrees of freedom on a microscopic basis, i.e., to handle the formation of clusters from nucleons (and their possible destruction) via a microscopic and dynamical model involving the explicit effects of nuclear forces. Emission of light charged clusters prior to the eventual evaporation is generally described on a phenomenological basis, either by the standard coalescence model [11,12] (in momentum space) or by percolation models applied at the end of the cascade stage [13]. When a pre-equilibrium module is introduced between the cascade and evaporation stages [14,15], cluster production during this stage can be accounted for as follows: the nucleus is continuously described as an excited Fermi gas, but a parametrized probability for light cluster emission is attached to each "exciton" configuration.…”

Multifragmentation in Heavy-Ion Processes

“…Sometimes this theory is grafted to the end of a dynamical theory that provides, somehow, information about the number of broken bonds (92)(93)(94)(95)(96)(97)(98)(99). Remarkably, this theory predicts many features of the experimentally observed mass distributions and fragment multiplicities.…”

Studies of intermediate-mass fragment emission in theHe3+Yennello1, Kwiatkowski2, Pollacco3 et al. 1993Phys. Rev. CSelf Cite20060View full textAdd to dashboardCite

“…In an effort to account for both the reaction dynamics and the subsequent fragmentation stage, Cugnon and Volant have performed calculations which couple the intranuclear cascade code dynamics with a percolation model [20] for generating complex fragments [57]. Here their model is applied to the results of the He+""Ag reaction.…”