Quantal diffusion in heavy-ion collisions

Abstract

We investigate the quasi-fission reactions in the basis on theStochastic Mean-Filed (SMF) approach that provides a microscopic and quantaldescription of the multi-nucleon exchange mechanism. In deep-inelastic heavy-ion collisions, collidingions stick and move together for a long time. During this contact time many nucleonsexchange between projectile and target nuclei, and the composite system thenseparate in two main primary fragments without forming a compound nucleus. Quasi-fissionis a non-compound nuclear process in deep-inelastic heavy-ion collisions andthe multi-nucleon exchange mechanism in the quasi-fission reactions isimportant. We calculate the quantal transport coefficients for heavy-ioncollisions at bombarding energies below their fusion barriers and determine theprimary fragment mass distributions. Quantal calculations are compared with theexperimental data.