STOPPING POWER IN NUCLEUS-NUCLEUS COLLISIONS AT ROOT-S = 200 AGEV

The microscopic phase space approach RQMD1 is used to investigate the stopping power of very heavy nuclei at collider energies. We find no g ap in the rapidity distribution around mid-rapidity even at RHIC energ ies (square-root s = 200 AGeV), but rather strong filling of the mid-r apidity region. Neither is there a broad plateau for secondaries nor a re the correlations between space-time and momentum as strong as in th e Bjorken-McLarren scenario. This renders the Bjorken picture question able at these energies for systems of combined mass A almost-equal-to 400.