Dynamics of pion production in heavy-ion collisions around 1A GeV energies

Abstract

Within the framework of the improved isospin dependent quantum molecular dynamics (ImIQMD) model, the dynamics of pion emission in heavy-ion collisions in the region 1 A GeV as a probe of nuclear symmetry energy at supra-saturation densities is investigated systematically. The total pion multiplicities and the ${\pi }^{-}/{\pi }^{+}$ yields are calculated for selected Skyrme parameters SkP, SLy6, Ska and SIII, and also for the cases of different stiffness of symmetry energy with the parameter SLy6. The influence of Coulomb potential, symmetry energy and in-medium pion potential on the pion production is investigated and compared each other by analyzing the distributions of transverse momentum and longitudinal rapidity and also the excitation functions of the total pion and the ${\pi }^{-}/{\pi }^{+}$ ratio. The directed flow, elliptic flow and polar angle distributions are calculated at the cases of different collision centralities and symmetry energies.

arXiv comment12 pages, 14 figures

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• Nuclear dynamics and particle production near threshold energies in heavy-ion collisions
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• Effective mass splitting of neutron and proton and isospin emission in heavy-ion collisions
• Probing the density dependence of symmetry energy via multifragmentation at sub-saturation densities
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• Constraining the high-density behavior of nuclear equation of state from strangeness production in heavy-ion collisions
• In-medium and isospin effects on particle production near threshold energies in heavy-ion collisions
• Nuclear in-medium and isospin effects on subthreshold kaon production in heavy-ion collisions
• Nuclear fragmentation and charge-exchange reactions induced by pions in the $\Delta$-resonance region
• Particle production in antiproton induced nuclear reactions
• Dynamics of strangeness production in heavy-ion collisions near threshold energies
• Probing nuclear symmetry energy with the sub-threshold pion production