SIMULATION OF HEAVY-ION COLLISION WITH IS OSPIN-SEPARATED RVUU MODEL

We generalize the previous RVUU model to be able to identify the isosp in degree of freedom of particles. This modified model is used to simu late the particle production in Au + Au collision at 1GeV / u. The cal culated momentum spectra of p, re + and K+ particles and multiplicitie s of the pi(+) and K+ and the ratio K+ / pi(+) as a function of the nu mber of participating nucleons agree very well with experimental data. The physical origin of the ratio K+ / pi(+) as function of participat ing nucleons is discussed.