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摘要
The production mechanism of pion in intermediate energy heavy-ion collisions has been studied by LQMD (Lanzhou Quantum Molecular Dynamics) model. The time evolution of multiplicity, rapidity distribution, transverse momentum spectra, collective flows, etc., is calculated in collisions of 40Ca+40Ca, 90Zr+90Zr, 96Zr+96Zr, 96Ru+96Ru and 197Au+197Au. The Δ-nucleon interaction potential and scattering, π-nucleon potential and scattering and stiffness of symmetry energy are to be investigated systematically. It is found that the π?/π+ ratio is influenced by the isospin-dependent Δ-nucleon potential and the pion production is suppressed by the in-medium Δ-nucleon scattering, in particular in the region of mid-rapidity and low-momentum of pion production. The transverse momentum spectra, rapidity distribution, collective flows and π?/π+ ratio are influenced by the isospin-dependent π-nucleon potential, in particular in the mid-rapidity and high-momentum region. The antiflow of π+ production is caused by the shadowing effect of participant nucleons. The triangular flow (V3) is similar to the directed flow (V1), but the magnitude of quadrangular flow (V4) is very small for the pion production. ? 2023 Chinese Academy of Sciences.
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