Evidence for a soft nuclear equation of state from kaon production in heavy ion collisions

The production of pions and kaons has been measured in Au+Au collisions at beam energies from 0.6 to 1.5 AGeV 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.

Note:

14 pages, 2 figures, accepted for publication in Phys. Rev. Lett

scattering: heavy ion
gold
hadron: multiple production
differential cross section: momentum dependence
pi+: multiplicity
K+: multiplicity
energy dependence
quantum molecular dynamics
thermodynamics
dependence: mass number

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