  Band mixing calculations in rapidly rotating well-deformed nuclei are
presented, investigating the properties of energy levels and rotational
transitions as a function of excitation energy. Substantial fragmentation of E2
transitions is found for $E_x \gsim$ 800 keV above yrast, which represents the
onset of rotational damping. Above $E_x \approx $ 2 MeV, energy levels and E2
strengths display fluctuations typical of quantum chaotic systems, which are
determined by the high multipole components of the two-body residual
interaction.
