We study the π ± -spectra obtained in 2, 4, 6 and 8A GeV Au-Au collisions within the thermal model. We find that the main features of the data can be well described after we include the pions from the decay of the ∆-resonance with medium mass modification.PACS. 25.75.-q Relativistic heavy-ion collisions -24.10.Pa Thermal and statistical models -25.75.Dw Particle and resonance production -24.10.NZ Hydrodynamic models
The two phase model for the quark-gluon deconfinement phase transition is modified based on the tempreature and density related properties of the hadron. The revised approach is consistent with the single body description. Its consequences on the pressure and energy density of the hadron gas is investigated, and the critical value of temperature and chemical potential of the phase transition from the hadron gas to a non-interacting quark matter are calculated. Our results agree with the recent lattice gauge calculations.
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