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The transition quadrupole moments, $Q_{\rm t}$, of four weakly populatedcollective bands up to spin $\sim$ $65\hbar$ in $^{157,158}$Er have beenmeasured to be ${\sim}11 {\rm eb}$ demonstrating that these sequences areassociated with large deformations. However, the data are inconsistent withcalculated values from cranked Nilsson-Strutinsky calculations that predict thelowest energy triaxial shape to be associated with rotation about the shortprincipal axis. The data appear to favor either a stable triaxial shaperotating about the intermediate axis or, alternatively, a triaxial shape withlarger deformation rotating about the short axis. These new results challengethe present understanding of triaxiality in nuclei.

physics letters b

Quadrupole Moments of Collective Structures up to Spin $\sim$ $65\hbar$  in $^{157}$Er and $^{158}$Er: A Challenge for Understanding Triaxiality in  Nuclei