Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2005-04-05
Phys.Rev. C73 (2006) 014307
Physics
Nuclear Physics
Nuclear Theory
11 pages, 7 figures; continuation of nucl-th/0504016
Scientific paper
10.1103/PhysRevC.73.014307
This article continues our previous study of level dynamics in the [O(6)-U(5)]$\supset$O(5) transition of the interacting boson model [nucl-th/0504016] 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 of numerous periodic orbits for E>0. The spectrum of allowed ratios of periods associated with beta- and gamma-vibrations exhibits an abrupt change around zero energy. These findings explain anomalous bunching of quantum states in the E$\approx$0 region, which is responsible for the redistribution of levels between O(6) and U(5) multiplets.
Cejnar Pavel
Heinze Stefan
Jolie Jan
Macek Michal
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