NUMERICAL-ANALYSES OF CERN 200 GEV A HEAVY-ION COLLISIONS BASED ON A HYDRODYNAMICAL MODEL WITH PHASE-TRANSITION/

We numerically analyze recent high energy heavy-ion collision experime nts based on a hydrodynamical model with phase transition and discuss a systematic change of initial state of QGP-fluid depending on collidi ng-nuclei's mass. In a previous paper, we formulated a (3+1)-dimension al hydrodynamical model for quark-gluon plasma with phase transition a nd discussed numerically the space-time evolution in detail. We here c ompare the numerical solution with the hadronic distributions given by CERN WA80 and NA35. Systematic analyses of the experiments with vario us colliding nuclei enable us to discuss the dependences of the initia l parameters of the hydrodynamical model on colliding nuclei's mass. F urthermore, extrapolating the present experiments, we derive the possi ble hadronic distributions for lead-lead 15D GeV/A collision.