2021/03/31 by Junping Yang, Yingxun Zhang, Ning Wang +1 · 1 citation
Physics and Astronomy · #nucl-th #nucl-ex
paper · pdf · doi:10.1103/physrevc.104.024605
published as Phys. Rev. C 104, 024605 (2021) · 8 pages, 4 figures
arxiv created 2021/08/12 · arxiv updated 2021/08/13
In this work, we firstly investigate how to reproduce and how well one can reproduce the Woods-Saxon density distribution of initial nuclei in the framework of the improved quantum molecular dynamics model. Then, we propose a new treatment for the initialization of nuclei which is correlated with the nucleonic mean-field potential by using the same potential energy density functional. In the mean field potential, the three-body force term is accurately calculated. Based on the new version of the model, the influences of precise calculations of the three-body force term, the slope of symmetry energy, the neutron-proton effective mass splitting, and the width of the wave packet on heavy ion collision observables, such as the neutron to proton yield ratios for emitted free nucleons [R(n/p)] and for coalescence invariant nucleons [Rci(n/p)] for 124Sn+112Sn at the beam energy of 200 MeV per nucleon, are discussed. Our calculations show that the spectra of neutron to proton yield ratios [R(n/p)] can be used to probe the slope of symmetry energy (L) and the neutron-proton effective mass splitting. In detail, the R(n/p) in the low kinetic energy region can be used to probe the slope of symmetry energy (L). With a given L, the inclination of R(n/p) to kinetic energy (Ek) can be used to probe the effective mass splitting. In the case where the neutron-proton effective mass splitting is fixed, R(n/p) at high kinetic energy can also be used to learn the symmetry energy at suprasaturation density.