2023/02/20 by Si-Na Wei, Wei, Si-Na, Zhao-Qing Feng +1
Earth and Planetary Sciences · Physics and Astronomy · #FOS: Physical sciences #High-Energy Particle Collisions Research #Nuclear Theory (nucl-th) #Nuclear physics research studies #earthquake and tectonic studies
paper · pdf · doi:10.48550/arxiv.2302.09984
openalex publication_date 2023/02/20 · openalex created_date 2023/02/22 · openalex updated_date 2026/07/28
The relativistic mean field approach by distinguishing \comthe slope of symmetry energy is implemented into the Lanzhou quantum molecular dynamics transport model (LQMD.RMF). The collective flows in the isotopic nuclear reactions are systematically investigated by the relativistic quantum molecular dynamics model \comwith various slopes of symmetry energy. The structure of the directed and elliptic flows is consistent with the results of the nonrelativistic transportation of nucleon system. \comThe directed flow difference between free neutrons and protons appears in the midrapidity region. The transverse momentum spectra of π+ production is close to each other in the nearly symmetric 108Sn + 112Sn system and the neutron-rich 132Sn + 124Sn system. However, since there are more neutron-neutron scatterings in neutron-rich system, the transverse momentum spectra of π- production in the neutron-rich system are higher than one in the nearly symmetric system. For a given reaction system, the transverse momentum spectra of π+ and π- production are independent on the stiffness of symmetry energy. This leads to the fact that the single ratio and the double ratio are independent on the stiffness of symmetry energy. Moreover, the double ratio without the π-nucleon potential decreases with increasing the transverse momentum. However, the double ratio with the inclusion of π potential increases with increasing the transverse momentum.