Chemical nonequilibrium in high-energy nuclear collisions

Jean Letessier, Johann Rafelski

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


Strange particles produced in S-Au/W/Pb 200 A GeV and Pb-Pb 158 A GeV reactions are described invoking final hadronic phase space in thermal equilibrium, but allowing chemical nonequilibrium. Several sets of statistical freeze-out parameters are obtained for each system, invoking different models of dense matter. We show that only when allowing for strange and non-strange flavour abundance nonequilibrium, a statistically significant description of the experimental results is obtained. Physical properties of the fireball at chemical freeze-out condition are evaluated and considerable universality of hadron freeze-out between the two different collision systems is established. The relevance of the Coulomb effect in the highly charged Pb-Pb fireballs for the chemical analysis are discussed. The influence of explosive collective matter flow is also described.

Original languageEnglish (US)
Pages (from-to)295-309
Number of pages15
JournalJournal of Physics G: Nuclear and Particle Physics
Issue number2
StatePublished - Feb 1999

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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