Abstract
The importance of an isospin dependent nuclear mean field (IDMF) in regard to the pion production mechanism is studied for the reaction Au+Au at 1 GeV/nucleon using the quantum molecular dynamics (QMD) model. In particular, the effect of the IDMF on pion spectra and the charged pion ratio are analyzed. It is found that the inclusion of a IDMF considerably suppresses the low-${p}_{t}$ pions, thus leading to a better agreement with the data on pion spectra. Moreover, the rapidity distribution of the charged pion ratio appears to be sensitive to the isospin dependence of the nuclear mean field.
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