Abstract
A superdeformed (SD) band consisting of 13 \ensuremath{\gamma}-ray transitions has been observed in $^{154}\mathrm{Er}$, an isotone of $_{66}^{152}\mathrm{Dy}$. The experiment was performed using the $^{118}\mathrm{Sn}$${(}^{40}$Ar,4n) reaction at E${(}^{40}$Ar)=185 MeV and the early implementation of GAMMASPHERE. This is an observation of a SD band in the A\ensuremath{\approxeq}150 region with a proton number greater than 66. The ${\mathcal{J}}^{(2)}$ moment of inertia of the band is constant above \ensuremath{\Elzxh}\ensuremath{\omega}=0.45 MeV and shows a sharp rise below this value suggesting a paired band crossing. These results suggest that total Routhian surface calculations fail to accurately predict the deformation of the band.
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