Study of Observables from Heavy Ion Data using VUU and QMD Calculations

Abstract

We give a short overview over some microscopic models including long and short range interactions. The idea of extracting the EOS is explained and its influence on physical observables is discussed. The collective sidewards flow of nuclear matter gives an indication to a repulsive high density region in the center of the reaction. This behaviour was already predicted by the hydrodynamical model. A second prediction was the stopping of the nuclei at central collisions. Here the momentum transfer via nucleon-nucleon collisions plays an important role. A new component of the collective flow is the squeeze out of highly energetic particles perpendicular to the reaction plane. From this observable one may hope to gain a direct view into the hot high density region. All three predictions, transverse flow, nuclear stopping and 90 degree out of plane squeeze are confirmed by experiment. The influence of the nuclear EOS on these observables and other influences like the nucleon-nucleon cross section are discussed. We conclude that the considered microscopic models are able to explain experimental data.