Levels in the Transitional Nuclei ${}^{106}{Ru}$ and ${}^{108}{Ru}$

Low-lying levels of

{}^{106}{Ru}

and

{}^{108}{Ru}

associated with the

β^{-}

decay of 36-sec

{}^{106}{Tc}

and 5-sec

{}^{108}{Tc}

have been investigated by measurement of

γ

singles and

γ - γ

coincidence spectra. The activities have been produced by thermal-neutron-induced fission of

{}^{235}U

and

{}^{239}{Pu}

using automated chemical separations of the technetium fraction from the fission product mixture. Excitation energies and

γ

-ray branching ratios indicate a transitional character between the limits of the vibrational and the rotational models for

{}^{106}{Ru}

and

{}^{108}{Ru}

, with some evidence for an asymmetric deformation.

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Levels in the Transitional NucleiRu106andRu108