New insight into the N/Z and mass equilibration in heavy-ion collisions

• DOI: 10.1103/physrevc.111.024602
• Publication Date: 2025-02-04T16:31:50Z
• Authors: Yu Yang; Zehong Liao; Zepeng Gao; Long Zhu; Jun Su; Cheng Li
• Keywords: Nuclear Theory (nucl-th); Nuclear Theory; FOS: Physical sciences

The dynamics of N/Z and mass equilibration are investigated in the reactions 112,124Sn + 239Pu by employing the isospin-dependent quantum molecular dynamics model. It is found that N/Z and mass equilibration take place at different collision stages. The N/Z relaxation is observed in the approaching phase (from first contact to deepest contact) with a very short time, whereas interestingly we find for the first time that mass equilibration only takes place in the separation phase (from the deepest contact to re-separation), which are explained by investigating the dynamical asymmetry between the approaching and separation phases. The mass equilibration also could be clarified with a dynamical potential energy surface. Our results provide a new insight into the equilibration dynamics of the quantum systems.