Gamma rays and conversion electrons were measured for the ${}_{}{}^{244}{}_{}{}^{}\mathrm{Am}$ beta decay isomers in an ${}_{}{}^{243}{}_{}{}^{}\mathrm{Am}$ target undergoing neutron capture in a high-flux reactor. New transitions accompanying beta decay of 26-min ${}_{}{}^{244}{}_{}{}^{}\mathrm{Am}_{}^g{}_{}{}^{}$ were observed. These include 984.92-keV and 977.80-keV $E0\mathrm{}$ transitions assigned to the deexcitation of a first-excited $0^{+}$ band in ${}_{}{}^{244}{}_{}{}^{}\mathrm{Cm}$ with level energies of 984.91 ($0^{+}$) and 1020.76 ($2^{+}$) keV. The ratio of reduced transition probabilities $\frac{B\left(E0\mathrm{}\right)\mathrm{}}{B\left(E2\mathrm{}\right)\mathrm{}}$ for the $0^{+}$ level is 1.5±0.2.

• Received 28 June 1983

DOI:https://doi.org/10.1103/PhysRevC.29.618