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Evolution of spectral properties along the O(6)-U(5) transition in the interacting boson model. II. Classical trajectories
We continue our previous study of level dynamics in the [O(6)--U(5)]\ensuremath{\supset}O(5) transition of the interacting boson model [Phys. Rev. C 73, 014306 (2006)] by using the semiclassical theory of spectral fluctuations. We find classical monodromy, related to a singular bundle of orbits with infinite period at energy $E=0$, and bifurcations …