In recent years, a new field of nuclear research has been opened through the possibility of studying nuclei wi\h very large values of angular momentum, temperature, pressure and number of particles. This development has been closely associated with heavy ion reactions, since collisions between two heavy nuclei are especially effective in producing metastable compound systems with large angular momentum, and in transferring energy which is distributed over the whole nuclear volume. Under the strain of temperature and of the Coriolis and centrifugal forces, the nucleus displays structural changes which can be interpreted in terms of pairing and shape phase transit- ions. This was the subject of the lectures of J. D. Garrett, P. J. Twin and S. Levit. While the rotational motion is, at zero temperature un- damped, the width of giant resonances indicate that the nucleus only oscillates through few periods before the motion is damp- ed by particle decay, and through coupling to the compound nucleus. Temperature and angular momentum influence in an im- portant way the properties of both giant resonances and rotatio- nal motion. These subjects were developed by K. Snover, and by P. F. Bortignon and R. A. Broglia, as well as by A. Bracco, A. Dellafiore and F. Matera.

Table of Contents:
Shape and Pair Correlations in Rotating Nuclei.- Superdeformation in 152Dy.- Giant Dipole Resonances in Hot Nuclei.- Hot Nuclei - Theory and Phenomena.- Relaxation of Nuclear Motion.- Neutron Decay of Giant Resonances in 208Pb.- A Semiclassical Theory of Nuclear Excitation Based on the Vlasov Equation.- On The Production of Superheavy Elements and The Limitations To Go Beyond.- Quasi-Elastic Transfer and Sub-Barrier Fusion in The Systems 32,36S+58, 64Ni.- Towards a Microscopic Description of Heavy Ion Dynamics.- A Simple Model for Deep-Inelastic Reactions.- Excitation Function Fluctuations for Dissipative Heavy Ion Collisions.- Statistical Multifragmentation of Nuclei.- Dynamical and Statistical Aspects of Intermediate Energy Heavy Ion Collisions.- Fragmentation in Medium Energy Heavy Ion Collisions.- Some Planned Experiments with Relativistic Heavy Ions.- Electromagnetic Excitation Processes in Relativistic Heavy Ion Collisions.- Ultrarelativistic Heavy-Ion Collisions and the Properties of Nuclear Matter Under Extreme Conditions.- SIS/ESR: A Heavy Ion Synchrotron and Cooler Facility at GSI.- The Nuclear Structure Facility at Daresbury.- The New Uppsala Accelerator Facilities and Their Experimental Programs.