Modeling pion production in heavy-ion collisions at intermediate energies

Abstract

Pion production in nucleus-nucleus collisions at intermediate energies was modeled in the framework of the Isospin-dependent Boltzmann-Uehling-Uhlenbeck (IBUU) transport model. The effects of nucleon-nucleon short-range correlations in initialization and mean-field potential, isospin-dependent in-medium baryon-baryon elastic and inelastic cross sections and pion in-medium effect are all considered in this model. It is found that the ratio and yields of ${\pi }^{-}$and ${\pi }^{+}$ in Au+Au reaction at 400 MeV/nucleon reproduce the FOPI/GSI data very well especially with a soft symmetry energy in the present transport model. Predictions on the single and double ${\pi }^{-}/{\pi }^{+}$ ratio are made for the isotope reaction systems ${}^{132}\mathrm{Sn}{+}^{124}\mathrm{Sn}$ and ${}^{108}\mathrm{Sn}{+}^{112}\mathrm{Sn}$ at 300 MeV/nucleon since related experiments are being carried out at RIKEN/Japan.

Comments: 7 pages, 7 figures, accepted version of PRC