Dependence of particle rapidity distribution on forward energy and multiplicity in nucleus-nucleus collisions at AGS energy

The rapidity distributions of particles produced in nucleus-nucleus (Au-Au) collisions at the Alternating Gradient Synchrotron (AGS) energy (11-15A Ge V) have been analyzed by the thermalized cylinder model and the three-fireb all model. It is shown that the two models are successful at the AGS energy . The normalized rapidity distributions of produced particles (exclusion of protons) described by the two models do not depend on the forward energy a nd multiplicity. The rapidity shifts in the two models do not depend on the impact parameter. The proton and deuteron normalized rapidity distribution s contributed by the participants in Au-Au collisions do not depend on the forward energy and multiplicity, but the final state proton and deuteron ra pidity distributions depend on the forward energy and multiplicity due to t he contributions of spectators.