2022/12/31 by Yingxun Zhang, Zhang, Yingxun, Yangyang Liu +7
Physics and Astronomy · #FOS: Physical sciences #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th) #Nuclear physics research studies #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2301.00212
openalex publication_date 2022/12/31 · openalex created_date 2023/01/06 · openalex updated_date 2026/07/28
By simultaneously describing the data of isospin sensitive nucleonic flow and pion observables, such as v2n/v2ch and π-/π+, with ultra-relativistic quantum molecular dynamics (UrQMD) model, we got the symmetry energy at flow and pion characteristic densities which are S(1.2ρ0)=34± 4 MeV and S(1.5ρ0)=36± 8 MeV. Within the uncertainties, the constraints of symmetry energy at characteristic densities are consistent with the previous constraints by using other transport models. The consistency suggests that the reliable constraints on symmetry energy should be presented at the characteristic density of isospin sensitive observables. By using the constraints of symmetry energy at two different characteristic densities, the extrapolated value of L is provided. Within 2σ uncertainty, the extrapolated value of L is in 5-70 MeV which is consistent with the recent combination analysis from PREX-II and astrophyiscs data. Further, the calculations with the constrained parameter sets can describe the data of charged pion multiplicities from SπRIT collaboration.