We have chemically separated ${}_{}{}^{247}{}_{}{}^{}\mathrm{Am}$ from the products of $\alpha$-particle bombardment of ${}_{}{}^{244}{}_{}{}^{}\mathrm{Pu}$. Gamma transitions of 226 and 285 keV are associated with its decay. The intensities of the $K$ and $L$ conversion electrons from the 226-keV transition are most consistent with $M2\mathrm{}$ multipolarity. We have found evidence in the americium fraction from both ${}_{}{}^3{}_{}{}^{}\mathrm{He}$- and $\alpha$-particle bombardments of ${}_{}{}^{244}{}_{}{}^{}\mathrm{Pu}$ for 153-, 205, and possibly 99- and 555-keV $\gamma$ rays and believe that these transitions follow $\beta$ decay of a high-spin ${}_{}{}^{246}{}_{}{}^{}\mathrm{Am}$ isomer.

• Received 2 June 1967

DOI:https://doi.org/10.1103/PhysRevLett.19.128