Within the framework of an isospin-dependent Boltzmann-Uehling-Uhlen beck (BUU) model using initial proton and neutron densities calculated from the nonlinear relativistic mean-field (RMF) theory, we compare the strength of transverse collective flow in reactions ^{48}Ca+^{58}Fe and ^{48}Cr+^{58}Ni, which have the same mass number but different neutron/proton ratios. The neutron-rich system (^{48}Ca+^{58}Fe) is found to show significantly stronger negative deflection and consequently has a higher balance energy, especially in peripheral collisions. NOTE ADDED IN PROOF: The new phenomenon predicted in this work has just been confirmed by an experiment done by G.D. Westfall et al. using the NSCL/MSU radioactive beam facility and a spartan soccer. A paper by R. Pak et al. is submitted to PRL to report the experimental result.
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机译：在根据等旋变依赖的玻尔兹曼-乌林-乌伦贝克（BUU）模型的框架中，使用非线性相对论平均场（RMF）理论计算的初始质子和中子密度，我们比较了反应中横向集合流的强度^ {48 } Ca + ^ {58} Fe和^ {48} Cr + ^ {58} Ni，它们的质量数相同，但中子/质子比不同。发现富含中子的系统（^ {48} Ca + ^ {58} Fe）表现出明显更强的负挠度，因此具有更高的平衡能，尤其是在外围碰撞中。补充说明：这项工作中预测的新现象刚刚被G.D. Westfall等人进行的实验所证实。使用NSCL / MSU放射束设施和斯巴达足球。 R. Pak等人的论文。提交给PRL报告实验结果。
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