Vr. Manfredi et L. Salasnich, A NOTE ON THE TODA CRITERION FOR INTERACTING DIPOLE-QUADRUPOLE VIBRATIONS, Modern physics letters A, 12(26), 1997, pp. 1951-1956
The Toda criterion of the Gaussian curvature is applied to calculate a
nalytically the transition energy from regular to chaotic motion in a
schematic model describing the interaction between collective dipole a
nd quadrupole modes in atomic nuclei.