Abstract
In nuclear collisions of Au+Au , Nb+Nb and Ca+Ca at bombarding energies between 150 and 800 MeV per nucleon, transverse energy and transverse momenta of light particles are studied event by event at θ=90° in the center of mass system. At all energies, a rise of the mean transverse energy per nucleon is observed with increasing charged particle multiplicity. Particularly large values of E⊥ have been found for 3He-fragments. The hydrodynamical picture is discussed for a possible separation of the collective flow and the thermal parts of the E⊥-spectrum. From this, evidence for a rather stiff equation of state is found.
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