Slow and Fast High-Spin Sequences in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Er</mml:mi></mml:mrow><mml:mprescripts/><mml:mrow/><mml:mrow><mml:mn>158</mml:mn></mml:mrow><mml:mrow/><mml:mrow/></mml:mmultiscripts></mml:mrow></mml:math>

Two branches are observed feeding the ${38}^{+}$ level of the yrast line in $^{158}\mathrm{Er}$. Two \ensuremath{\sim}1.2-MeV cascade transitions constitute a fast (\ensuremath{\sim}1 ps) collective component, probably with only minor changes in shape and structure from those at lower spin. Four slower $\ensuremath{\gamma}$ rays (&gt;2 ps) suggest a transition to a different shape and structure, most likely to an oblate ${46}^{+}$ state with all valence particles maximally aligned, a band termination.

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