标题： 动量依赖的核平均场和重离子碰撞中的集体流 显示英文标题

标题： Momentum--dependent nuclear mean fields and collective flow in heavy ion collisions

摘要： 我们使用玻尔兹曼-乌林-乌伦贝克模型来模拟重离子碰撞的动力学演化，并比较两种动量相关的核平均场参数化方法的效果，这两种方法在冷核物质中具有相同的性质。 我们与最近关于核流的数据进行比较，这些数据由横向动量分布和流（$F$）变量表征，适用于对称和不对称系统。 我们发现核平均场对粒子动量的精确函数依赖性非常重要。 通过我们的方法，我们也确认对称和不对称系统之间的差异可以用来确定核自洽单体势的密度和动量依赖性，而无需考虑其他因素。 所有数据都可以通过具有压缩率 K = 210 MeV 的动量相关相互作用很好地再现。 显示英文摘要

摘要： We use the Boltzmann-Uehling-Uhlenbeck model to simulate the dynamical evolution of heavy ion collisions and to compare the effects of two parametrizations of the momentum--dependent nuclear mean field that have identical properties in cold nuclear matter. We compare with recent data on nuclear flow, as characterized by transverse momentum distributions and flow ($F$) variables for symmetric and asymmetric systems. We find that the precise functional dependence of the nuclear mean field on the particle momentum is important. With our approach, we also confirm that the difference between symmetric and asymmetric systems can be used to pin down the density and momentum dependence of the nuclear self consistent one--body potential, independently. All the data can be reproduced very well with a momentum--dependent interaction with compressibility K = 210 MeV.