The mechanism concerning to pion production in heavy-ion collisions at intermediate energies has increasing interests recently.We modeled pion production in nucleus-nucleus collisions at intermediate energies 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 π- and π+in Au+Au reaction at 400 MeV/u reproduce the FOPI/GSI data very well especially with a soft symmetry energy in the present transport model.Predictions on the single and double π-/π+ratio are made for the isotope reaction systems ^(132)Sn+^(124)Sn and ^(108)Sn+^(112)Sn at 300 MeV/u since related experiments are being carried out at RIKEN/Japan[1].
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