Observation of a Discrete-Line Superdeformed Band up to60ℏinDy152

Abstract

A rotational band of nineteen transitions with a moment of inertia ${\mathfrak{J}}_{\mathrm{band}}^{\mathrm{}\left(2\right)\mathrm{}}$ of $84{\hslash }^2$ ${\mathrm{MeV}}^{-1\mathrm{}}$ has been observed in ${}_{}{}^{152}{}_{}{}^{}\mathrm{Dy}$. The band feeds into the oblate yrast states between ${19}^{-}$ and ${25}^{-}$ and it is proposed that the lowest member of the band has a spin of ${22}^{+}$ and thus the band extends up to $60\hslash$. It is identified as the yrast superdeformed band and its intensity accounts for the whole of the ridge structure seen previously in continuum $E_{\gamma }-E_{\gamma }$ correlations.