Dissipative heavy ion collisions

Nucleus-nucleus collisions are described utilizing the particle exchange model in which two Fermi gases exchange particles, momentum and entropy through a window in the mean single particle potential. Even at zero temperature transfer of particles is possible because phase space which is not Pauli blocked is available due to different Fermi distributions on either side of the window. The resulting transport and diffusion phenomena are discussed. The nuclear shapes employed in the model range from two separated and deformed nuclei to compact mono-nuclear forms containing the compound sphere. The addition of the wall dissipation allows to describe the whole range of dissipative reactions including quasi-fission. (orig.)