Simulation of Heavy Ion Reactions with Nonlocal Kinetic Equations

The incorporation of realistic trajectories of two-particle scattering into existing BUU or QMD codes meets considerable difficulties. We propose a method of replacing the scattering event by a tractable non-local scenario reproducing the correct asymptotics. The first principle derivation justifies the use of corresponding nonlocal kinetic equations. The nonlocal shifts are necessary if the system should approach an equation of state with second quantum virial coefficient. The modifications of QMD and BUU codes are discussed and comparison are presented with resent data. We find a pre-equilibrium production of particles leading to higher energetic distributions of protons.