Abstract

Extremely high statistics \ensuremath{\gamma}-\ensuremath{\gamma} coincidence data for $^{168}\mathrm{Er}$ have been recorded following thermal neutron capture on $^{167}\mathrm{Er}$. The results alter considerably recent experimental and theoretical work on $^{168}\mathrm{Er}$ and affect conclusions concerning the quality of the K quantum number in the neutron resonance region: earlier claims that K remains good and that this energy region is nonchaotic are shown to be based in part on band assignments that need to be seriously reexamined.

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