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.