LBL-9902 NUCLEAR COLLISIONS AT SEVERAL TENS OF MeV PER NUCLEUS* J^rgen Randrup Nuclear Science Division Lawrence Berkeley Laboratory Berkeley, California 94720 PREFACE Nuclear beams with energies of several tens of MeV per nucleon will soon be available at a number of research centers around the world. Such beams offer a tool for probing new aspects of nuclear structure and dynamics. As the energy is raised models and concepts developed for the relatively well-studied lower-energy domain will be pressed to their limits and are likely to grow obsolete as novel phenomena enter the scene. The first part of these notes deals with the theory of ordinary damped collisions; the testing of such theories is one important aspect of the research with higher beam energies. Another is the search for truly novel phenomena and the second part of these noteF contains some more speculative material on that aspect. Notes for lectures given at the Serre-Chevallier Summer School 10-14 September 197s*. France :i is work was supported by the Nuclear Science Division of the U.S. Department of Energy under contract No. W-7405-ENG-48.