Shell Effects on Rotational Damping in Superdeformed Nuclei
نویسنده
چکیده
Damping of collective rotational motion in A ∼ 190 and A ∼ 150 superdeformed nuclei is studied by means of the cranked shell model with two-body residual force. Numerical calculations predict that in a typical A ∼ 190 superdeformed nucleus, Hg, the rotational damping width is significantly small, Γrot ∼ 30 keV, and that the number of superdeformed bands in the off-yrast region amounts up to 150 at a given rotational frequency. These features are quite different from the prediction for A ∼ 150 superdeformed nuclei and rare-earth normally deformed nuclei. It is shown that the single-particle alignments of the cranked Nilsson orbits have strong shell oscillation. It affects significantly the properties of rotational damping in superdeformed Hg. PACS : 21.10.Ma, 21.10.Pc keywords : Rotational damping, Superdeformed nuclei, Shell effect, Angular momentum alignment
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