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                                 Abstract:We generalize the previous RVUU model to he able to identify the isospin degree of freedom of particles. This modified model is used to simulate the particle production in Au+Au collision at 1GeV/u. The calculated momentum spectra of p, π+ and K+ particles and multiplicities of the π+ and K+ and the ratio K+/π+ as a function of the number of participatiang nucleons agree very well with experimental data. The physical origin of the ratio K+/π+ as function of participating nucleons is discussed.
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                        References
	
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