Abstract
In this work, we first 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 and for coalescence invariant nucleons for at the beam energy of 200 MeV per nucleon, are discussed. Our calculations show that the spectra of neutron to proton yield ratios can be used to probe the slope of symmetry energy () and the neutron-proton effective mass splitting. In detail, the in the low kinetic energy region can be used to probe the slope of symmetry energy (). With a given , the inclination of to kinetic energy () can be used to probe the effective mass splitting. In the case where the neutron-proton effective mass splitting is fixed, at high kinetic energy can also be used to learn the symmetry energy at suprasaturation density.
- Received 24 March 2021
- Revised 20 June 2021
- Accepted 23 July 2021
DOI:https://doi.org/10.1103/PhysRevC.104.024605
©2021 American Physical Society