  We present a macroscopic model for the energy of rotation nuclei which has
several refinements relative to the rotating liquid drop model. The most
important features are the inclusion of the shell correction and using a new
family of triaxial compact and creviced shapes to describe transition of the
system from one sphere to a two separated spheres. With this model we calculate
the properties of point of equilibrium corresponding to nuclear ground states,
isomeric states and fission saddle-points. The model is applied to the nuclei
56Ni, 48Cr and 80Zr. The results obtained allowed to explain the light compound
nuclear system fission phenomena and predict the existence of hyperdeformed
states at very high spins.
