Momentum dependent Vlasov-Uehling-Uhlenbeck calculation of mass dependence of the flow disappearance in heavy-ion collisions

We perform calculations for different systems to study the mass dependence of flow disappearance in heavy-ion collisions in a relativistic Vlasov-Uehling-Uhlenbeck approach based on Walecka's σ-ω model. We find that the mass dependence of the energy of vanishing flow is the result of a complex interplay among the momentum dependence of the nuclear mean field, Coulomb potential, and n-n collisions. The effect of the n-n collisions is predominant and the particular scaling value (A-1/3) of the mass dependence can be related to the scaling behavior of the collision number per nucleon