Dynamical and random aspects of transfer in heavy ion collisions

A classical dynamical theory for heavy ion collisions is developed which allows for transfer through the window between the strongly interacting target and projectile. The transfer is treated as a random walk process and a feed back effect on the orbital motion from the transfer is obtained by adjusting the ion-ion potentials each time a transfer occurs. The method is used successfully to analyze the reaction Kr + Bi at 600 MeV. It yields very good agreement between theory and experiment for the angular distribution. Furthermore, it accounts very well for the mass distribution at two different angles and for the final energy distributions. The analysis allows the extraction of friction coefficients, diffusion constant and drift rates, which are compared with other models.