  We explore, as function of the collision energy and stopping in relativistic
nuclear collisions, the production yields of strange particles, in particular
strange antibaryons,assuming formation of a deconfined thermal QGP-fireball
which undergoes a sudden hadronisation. The non-equilibrium freeze-out
conditions are established and strange antibaryon excitation functions are
shown to have characteristic features that should allow to discriminate between
the QGP hypothesis and other reaction scenarios.
