The production of pions and kaons has been measured in ¹⁹⁷Au+¹⁹⁷Au collisions at beam energies from 0.6 to 1.5AGeV with the kaon spectrometer at SIS/GSI. The K⁺ meson multiplicity per nucleon is enhanced in Au+Au collisions by factors up to 6 relative to C+C reactions, whereas the corresponding pion ratio is reduced. The ratio of the K⁺ meson excitation functions for Au+Au and C+C collisions increases with decreasing beam energy. This behavior is expected for a soft nuclear equation-of-state.
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Sturm et al. (2001) studied this question.
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