We have measured pi+/-, K, P and P spectra from proton and sulfur coll
isions with nuclear targets at the at beam energies of 450 Gev and 200
Gev per nucleon respectively. For central SA collisions we see that k
aons and (anti)protons have large transverse energies. Protons are mov
ed into central rapidity by rescattering where they annhilate antiprot
ons. The RQMD event generator qualitatively reproduces these trends wh
ile Fritjof does not.