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We report a correlation between the kinetic energy loss and nucleon diffusion for Krand Xe-induced reactions on heavy targets. Although this correlation suggests that these two phenomena occur on the same general time scale, the rate of kinetic energy loss decreases with interaction time. Evidence is presented to show that the initial energy dissipation rate is consistent with a frictional force which is proportional to the relative velocity.

Detailed information on a new reaction mechanism is presented for a 600-MeV 84 Kr bombardment of 209 Bi. This reaction process represents a major fraction of the totalreaction cross section and is characterized by strong damping of energy degrees of freedom, but on the average, a relatively small amount of mass exchange compared to fis-