Abstract
The pion multiplicity per participating nucleon in central nucleus-nucleus collisions at the energies 2-15 A-GeV is significantly smaller than in nucleon-nucleon interactions at the same collision energy. This effect of pion suppression is argued to appear due to the evolution of the system produced at the early stage of heavy-ion collisions towards a local thermodynamic equilibrium and further isentropic expansion.
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Gaździcki, M., Gorenstein, M.I. & Mrówczyński, S. Pion suppression in nuclear collisions. Eur. Phys. J. C 5, 129–133 (1998). https://doi.org/10.1007/s100529800830
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DOI: https://doi.org/10.1007/s100529800830