Abstract
Within the diffusion description of mass transport in deeply inelastic collisions shell effects give rise to nonlinear drift coefficients. These are treated here using closure approximations for the set of equations for the variance and the mean mass. Application to238U+238U collisions is given. The central dip in theA1-potential screens the shell induced drift for small and medium energy loss and suppresses side peaks. As an example for asymmetric injection a model for136Xe+209Bi is discussed. Quite general, the particular shape ofU(A1) seems to be rather important for the interpretation of the data for all energy losses.
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