Isospin effect in peripheral heavy-ion collisions at Fermi energies
Abstract
Within the framework of the Lanzhou quantum molecular dynamics (LQMD) transport model, the isospin effect in peripheral heavy-ion collisions has been investigated thoroughly. A coalescence approach is used for recognizing the primary fragments formed in nucleus-nucleus collisions. The secondary decay process of the fragments is described by the statistical code, GEMINI. Production mechanism and isospin effect of the projectile-like and target-like fragments are analyzed with the combined approach. It is found that the isospin migration from the high-isospin density to the low-density matter takes place in the neutron-rich nuclear reactions, i.e., Ca+Pb, Kr+Ca/Pb/Sn, Xe+Pb, Sn+Sn and Xe+Xe. A hard symmetry energy is available for creating the neutron-rich fragments, in particular in the medium-mass region. The isospin effect of the neutron to proton (n/p) ratio of the complex fragments is reduced once including the secondary decay process. However, a soft symmetry energy enhances the n/p ratio of the light particles, in particular at the kinetic energies above 15 MeV/nucleon.
Keywords
Cite
@article{arxiv.1904.03066,
title = {Isospin effect in peripheral heavy-ion collisions at Fermi energies},
author = {Ya-Fei Guo and Peng-Hui Chen and Fei Niu and Zhao-Qing Feng},
journal= {arXiv preprint arXiv:1904.03066},
year = {2019}
}
Comments
8 pages, 8 figures