Level Structure ofDy164from the ReactionDy163(n, γ)Dy164

Gamma rays from the reaction ${}_{}{}^{163}{}_{}{}^{}\mathrm{Dy}(n, \gamma ){}_{}{}^{164}{}_{}{}^{}\mathrm{Dy}$ have been observed with a Ge(Li) spectrometer operated in the pair mode. Transitions have been observed from the capture state to the $2^{+}$ (73.39-keV) and $4^{+}$ (242.23-keV) members of the ground-state rotational band, to the $2^{+}$ (761.80-keV) and $3^{+}$ (828.2-keV) members of the $K^{\pi }=2^{+}$ gamma-vibrational band, and to the $2^{-}$ (976.9-keV) and $3^{-}$ (1039.3-keV) members of the $K^{\pi }=2^{-}$ octupole band. Transitions to the $4^{+}$ member of the gamma band and to the $4^{-}$ member of the octupole band have not been observed. In order to explain this anomalous gamma-ray branching, it is hypothesized that the capture-state wave function contains components with well-defined $K$ values.