Chemical freeze-out conditions in central S-S collisions at 200 A GeV

Josef Sollfrank, Marek Gaździcki, Ulrich Heinz, Johann Rafelski

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113 Scopus citations


We determine the chemical freeze-out parameters of hadronic matter formed in central S-S collisions at 200 A GeV, analyzing data from the NA35 collaboration at CERN. In particular we study the quark (baryon number) and strange quark fugacities, as well as the strange quark phase-space occupancy and the freeze-out temperature. The strange quark chemical potential is found to be consistent with zero, and the strange quark abundance is found to be saturated as would be expected for the deconfined phase. We study the stability of our results against variations in the analysis procedure and with respect to a restriction of the data to the central rapidity region. The same analysis applied to nucleonnucleon data yields significantly different freeze-out parameters, in particular regarding the degree of strangeness saturation.

Original languageEnglish (US)
Pages (from-to)659-665
Number of pages7
JournalZeitschrift für Physik C Particles and Fields
Issue number4
StatePublished - Dec 1994

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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