Chemical and thermal freeze-out parameters from 1A to 200A GeV

The present knowledge about hadrons produced in relativistic heavy ion collisions is compatible with chemical freeze-out happening when the energy density divided by the particle density reaches the value of 1 GeV. This observation is used to determine the energy dependence of the chemical freeze-out parameters T_ch and μ_B^ch for beam energies varying between 1 and 200A GeV. The consequences of this energy dependence are studied for various particle ratios. Predictions for particle ratios at beam energy 40A GeV are presented. The conditions for thermal freeze-out are also determined. These correspond either to an energy density of 45 MeV/fm³ or to a particle density of 0.05/fm³.