Levels of ${}_{}{}^{109}{}_{}{}^{}\mathrm{Cd}$ populated by ${}_{}{}^{108}{}_{}{}^{}\mathrm{Pd}(\alpha , 3n\gamma ){}_{}{}^{109}{}_{}{}^{}\mathrm{Gd}$ have been studied by measuring $\gamma$-ray excitation functions, direct $\gamma$ spectra, $\gamma -\gamma$ coincidences, and $\gamma$-ray angular distributions and by performing lifetime measurements. An intense $\gamma$-ray cascade has been observed, built on the ${\frac{11}{2}}^{-}$ intrinsic state and involving states of spin ${\frac{11}{2}}^{-}$, ${\frac{15}{2}}^{-}$, ${\frac{19}{2}}^{-}$, ${\frac{23}{2}}^{-}$, and (${\frac{27}{2}}^{-}$). A decay level scheme is proposed including states up to 4502 keV.

NUCLEAR REACTION ${}_{}{}^{108}{}_{}{}^{}\mathrm{Pd}(\alpha , 3n\gamma )$, $E=36.7-45.8\mathrm{}$ MeV; enriched ${}_{}{}^{108}{}_{}{}^{}\mathrm{Pd}$ target; measured $\sigma \mathrm{}\left(E\right)\mathrm{}$, $\gamma -\gamma$ coin, $\sigma \left(\theta \right)\gamma$, $T_{\frac{1}{2}}$, deduced decay scheme, $J$, $\pi$.

• Received 15 July 1975

DOI:https://doi.org/10.1103/PhysRevC.12.1858