ON SPACE-TIME EVOLUTION OF NUCLEAR COLLISIONS AT CERN-SPS ENERGIES

Sire make an attempt to combine information from different CERN-SPS da ta on nuclear interactions to get a rough picture of the space-time ev olution of these collisions. Topics discussed include: formation time of hadrons, energy densities reached in heavy-ion interactions, depend ence of longitudinal radii R-L on nucleon numbers of colliding nuclei, e(+)e(-) and strangeness production and J/Psi suppression. We argue t hat the CERN-SPS data on heavy-ion collisions might be consistent with the picture of the space-time evolution consisting of a stage of inte rmediate gluons, with duration of 0.5-2,0 fm/c depending on the size o f the system, followed by the stage of interacting hadron gas. The beh aviour of hadron gas is supposed to be strongly influenced by the form ation time of hadrons and its Lorentz dilation.