用同位旋分离的RVUU模拟重离子碰撞

Simulation of Heavy-Ion Collision With Isospi-Separated RVUU Model

推广了原来的ＲＶＵＵ模型，进一步分离了粒子的同位旋自由度。并用它模拟了每核子１ＧｅＶ入射能量的Ａｕ＋Ａｕ碰撞，得到了与实验符合很好的ｐ．π＋和Ｋ＋动量谱，Ｋ＋与π＋多重数及其比值Ｋ＋／π＋随参加粒子数目的变化规律，同时从理论上分析了Ｋ＋／π＋产额比曲线的物理意义。

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 1 GeV / 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.