Properties of superdeformed bands in the A = 194 region

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Cyclotrons, Energy Levels, Gamma Rays, Nuclear Structure, Radioactive Decay, Spectrometers, Spin, Angular Momentum, Lead Isotopes, Magnesium Isotopes, Mercury Isotopes, Moments Of Inertia, Thallium Isotopes, Ytterbium Isotopes

Scientific paper

At least eighteen superdeformed (SD) bands have been identified in mercury, thallium, and lead nuclei since the report of a SD band in (191)Hg. Systematic information is beginning to emerge on the properties of the SD bands in this mass region, and comparisons with SD bands in the A = 150 region are now possible. Recently, data were obtained with the HERA spectrometer at the Lawrence Berkeley Laboratory 88 Cyclotron on SD bands in (194)Pb and (196)Pb. In these experiments, we bombarded (176)Yb with (24)Mg and (26)Mg. The cross bombardment was necessary to make the assignment of the band to (196)Pb certain. These bands are typical of other SD bands in the region in many ways. The gamma rays have energies that range from about 200 to 800 keV. The gamma-ray spacing decreases from about 40 to 30 keV as the transition energy increases. Their intensities gradually increase as the gamma-ray energies decrease over the upper half of of the sequence, and then sustain a constant value until the one or two lowest energy transitions.

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