Chaotic Behavior in Warm Deformed Nuclei Induced by Residual Two-Body   Interactions
  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. 
M.Matsuo, T.D{\o}ssing, B.Herskind, S.Frauendorf, E.Vigezzi and   R.A.Broglia