Abstract
Experimental results from the HELIOS set-up (High Energy Lepton and Ion Spectrometer, in operation at the CERN Super Proton Synchrotron to study high-energy nucleus-nucleus collisions) are presented and discussed. The transverse energy differential cross section can be parametrized by a geometrical model. The energy density reached in these collisions is much larger than that inside the nucleon and is in the region of the critical value 2·5 GeV/fm3 obtained from lattice QCD calculations for the deconfinement transition. The transverse momentum spectra of photons agree in shape and absolute cross section with the photon spectra expected from hadronic sources.
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