Effects of pion potential and nuclear symmetry energy on the ${\pi }^{-}/{\pi }^{+}$ ratio in heavy-ion collisions at beam energies around the pion production threshold

Abstract

Within the framework of the isospin-dependent Boltzmann-Uehling-Uhlenbeck(IBUU) transport model, we studied the effects of the pion potential and the symmetry energy on the pion production in the central ${}^{197}Au{+}^{197}Au$ collisions around the pion production threshold. It is found that the pion potential has opposite effects on the value of ${\pi }^{-}/{\pi }^{+}$ ratio at low and high pion energies. The effect of the pion potential on the total ${\pi }^{-}/{\pi }^{+}$ ratio becomes larger in heavy-ion collisions at beam energies below the pion production threshold. And at beam energies below the pion production threshold, with the pion potential, the effect of the symmetry energy on the ${\pi }^{-}/{\pi }^{+}$ ratio becomes smaller compared with that above the pion production threshold.

13 pages, 10 figures, PRC in production

References in corpus (5)

• Systematics of pion emission in heavy ion collisions in the 1A GeV regime
• Isospin effects on sub-threshold kaon production at intermediate energies
• Probing the Nuclear Symmetry Energy with Heavy-Ion Reactions Induced by Neutron-Rich Nuclei
• Normal or abnormal isospin-fractionation as a qualitative probe of nuclear symmetry energy at supradensities
• Effect of the momentum dependence of nuclear symmetry potential on pion-/pion+ ratio in heavy-ion collisions

Cited by in corpus (5)

• Insights on pion production mechanism and symmetry energy at high density
• Symmetry energy extracted from the S$\pi$RIT pion data in Sn+Sn systems
• Probing in-medium nucleon-nucleon inelastic scattering cross section by using energetic n/p ratio
• Effects of an induced electric field on π^{-}/π^{+} ratio in heavy-ion collisions
• In-medium pion dispersion relation and medium correction of $N\pi \leftrightarrow \Delta$ near the threshold energy of pion production