  The stopping behaviour of baryons in massive heavy ion collisions (at SPS,
RHIC and LHC) is investigated within different microscopic models. At
SPS-energies the predictions range from full stopping to virtually total
transparency. Experimental data are indicating strong stopping. The initial
baryo-chemical potentials and temperatures at collider energies and their
impact on the formation probability of strange baryon clusters and strangelets
are discussed.
