New oblate band in 196Hg with quenched M1 strength

Physics – Nuclear Physics

Scientific paper

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Collective Levels, Shell Model, Collective Models, 190<=A<=219

Scientific paper

High-spin states in the nucleus 196Hg were populated in the reaction 192Os(9Be,5n) at a beam energy of 65 MeV. A regular rotational-like ΔI=1 band has been observed up to an excitation energy of E*~=8.7 MeV and spin I~=30ħ. This is the second observation of a band of this character in a mercury isotope. The experimental results are compared with mean field calculations and semiclassical estimates based on the Dönau-Frauendorf formalism. The mercury bands show significantly lower B(M1)/B(E2) branching ratios as compared with similar bands in light lead nuclei. This difference may be more readily explained by a difference in single-particle structure rather than by large differences in deformation between the lead and mercury configurations.

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