Probing the Dissipation Mechanism in Ternary Reactions of 197Au+197Au by Mean Free Path of Nucleons

摘要

the collision of very heavy nuclei 197Au+197Au at 15A MeV has been studied within the improved quantum molecular dynamics model.A class of ternary events satisfying nearly complete balance of mass numbers is selected.The experimental mass distributions for the system 197Au+197Au ternary fission fragments,the heaviest (A1),the intermediate (A2) and the Iightest (A3),are reproduced well.The mean free path o[ nucleons in the reaction system is studied and the shorter mean free path is responsible for the ternary fission with three mass comparable fragments,in which the two-body dissipation mechanism plays a dominant role.