${}_{}{}^{246}{}_{}{}^{}\mathrm{Pu}$ produced by multiple neutron capture during an underground explosion was recovered and subjected to extensive chemical separations. $\gamma$ rays in the decay sequence ${}_{}{}^{246}{}_{}{}^{}\mathrm{Pu}\left({\beta }^{-}\right)-{}_{}{}^{246m}{}_{}{}^{}\mathrm{Am}\left({\beta }^{-}\right){}_{}{}^{246}{}_{}{}^{}\mathrm{Cm}$ were investigated by use of several Ge(Li) detectors. In all, 158 $\gamma$ rays were observed, up to 2.2 MeV. Of these, 114 were ascribed to the decay of ${}_{}{}^{246m}{}_{}{}^{}\mathrm{Am}$. A decay scheme was deduced, including 37 levels. Bands in ${}_{}{}^{246}{}_{}{}^{}\mathrm{Cm}$ have been identified with the following bandhead energies: $\mathrm{g}.\mathrm{s}.\mathrm{}{K}^{\pi }=0^{+}$; 841.70 keV $K^{\pi }=2^{-}$, octupole; 1078.90 keV $K^{\pi }=1^{-}$, octupole; 1124.42 keV $K^{\pi }=2^{+}$, $\gamma$; 1249.81 keV $K^{\pi }=(0^{-}, \mathrm{octupole})$; 1348.89 keV $K^{\pi }=1^{-}$; 1452.06 keV $K^{\pi }=\left(1^{+}\right)$; 1593.80 keV $K^{\pi }=2^{\mathrm{}(-)\mathrm{}}$; 1604.31 keV $K^{\pi }=1^{-}$.

• Received 19 October 1970

DOI:https://doi.org/10.1103/PhysRevC.3.1338