Dynamical nucleus-nucleus potential and incompressibility of nuclear matter

TL;DR

This study uses the improved quantum molecular dynamics model to explore how nuclear matter incompressibility affects the dynamical nucleus-nucleus potential in fusion reactions, providing insights into nuclear interaction dynamics.

Contribution

It introduces two new parameter sets for the ImQMD model with different incompressibility coefficients and analyzes their impact on fusion and fragmentation processes.

Findings

Fusion excitation functions are well reproduced.

Charge distributions of fragments match experimental data.

Nuclear matter incompressibility influences the nucleus-nucleus potential.

Abstract

The dynamical nucleus-nucleus potentials for some fusion reactions are investigated by using the improved quantum molecular dynamics (ImQMD) model with different sets of parameters in which the corresponding incompressibility coefficient of nuclear matter is different. Two new sets of parameters SKP* and IQ3 for the ImQMD model are proposed with the incompressibility coefficient of 195 and 225 MeV, respectively. The measured fusion excitation function for 16O+208Pb and the charge distribution of fragments for Ca+Ca and Au+Au in multi-fragmentation process can be reasonably well reproduced. Simultaneously, the influence of the nuclear matter incompressibility and the range of nucleon-nucleon interaction on the nucleus-nucleus dynamic potential is investigated.