Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1995-12-01
Phys.Rev.C53:2213-2226,1996
Physics
Nuclear Physics
Nuclear Theory
22 pages, REVTeX, 12 postscript figures are available on request
Scientific paper
10.1103/PhysRevC.53.2213
Microscopic RPA calculations based on the cranked shell model are performed to investigate the quadrupole and octupole correlations for excited superdeformed bands in 190Hg, 192Hg, and 194Hg. The K=2 octupole vibrations are predicted to be the lowest excitation modes at zero rotational frequency. At finite frequency, however, the interplay between rotation and vibrations produces different effects depending on neutron number: The lowest octupole phonon is rotationally aligned in 190Hg, is crossed by the aligned two-quasiparticle bands in 192Hg, and retains the K=2 octupole vibrational character up to the highest frequency in 194Hg. The gamma vibrations are predicted to be higher in energy and less collective than the octupole vibrations. From a comparison with the experimental dynamic moments of inertia, a new interpretation of the observed excited bands invoking the K=2 octupole vibrations is proposed, which suggests those octupole vibrations may be prevalent in SD Hg nuclei.
Matsuyanagi Kenichi
Mizutori Shoujirou
Nakatsukasa Takashi
Shimizu Yoshifumi R.
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