Abstract
We study the K +/π + and K −/π − production rates in heavy ion collisions, using a hadron gas model which includes baryon repulsion and intermediate resonances, taking strangeness conservation into account. In such a description, the state of the system is specified by its temperature T and its baryon number density n B. Fixing the K +/π + and K −/π − rates then determines the freeze-out values of T and n B. The production rates recently measured in silicon-gold collisions at the Brookhaven AGS energies are shown to give 93 ⩽ T ⩽ 112 MeV and 0.02 ⩽ n B ⩽ 0.12 baryons/fm 3.
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