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Restoration of the Broken D2-Symmetry in the Mean Field Description of Rotating Nuclei

F. Dönau·Jing-ye Zhang·L. L. Riedinger
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Abstract

Signature effects observed in rotational bands are a consequence of an inherent D2-symmetry. This symmetry is naturally broken by the mean field cranking approximation when a tilted (non-principal) axis orientation of the nuclear spin becomes stable. The possible tunneling forth and back between the two symmetry-related minima in the double-humped potential-energy surface appears as a typical bifurcation of the rotational band. We describe this many-body process in which all nucleons participate by diagonalizing the nuclear Hamiltonian within a selected set of tilted and non-tilted cranking quasiparticle states. This microscopic approach is able to restore the broken D2 symmetry and reproduce the quantum fluctuations between symmetry- related HFB states which emerge as splitting of the band energies and in parallel staggering in intraband M1 transitions.

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F. Dönau, Jing-ye Zhang, L. L. Riedinger. 1998-09-15. Restoration of the Broken D2-Symmetry in the Mean Field Description of Rotating Nuclei. https://doi.org/10.1016/s0370-2693(99)00180-x

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