  The statistical event-by-event analysis of inelastic interactions of 16O and
32S nuclei in emulsion at 60 A GeV/c and 200 A GeV/c reveals the existence of
groups of high multiplicity events belonging to very central nuclear
interactions with Gaussian pseudorapidity distributions for produced particles
as suggested by the original hydrodynamic-tube model. Characteristics of these
events are presented. The experimental observations are interpreted as a result
of quark-gluon plasma formation in the course of central nuclear interactions.
