Radioactive decay of 47-minEum154%

A 47-min isomer has been identified in ${}_{}{}^{154}{}_{}{}^{}\mathrm{Eu}$. Sources were prepared in ($n,\gamma$) and ($d,p$), ($d,2n$) and ($p,n$), and ($d,\alpha$) reactions on Eu, Sm, and Gd, respectively, and in each case the 47-min activity followed the Eu fraction in the separation of ${\mathrm{EuSO}}_4$. Singles and coincidence $\gamma$-ray studies confirmed a number of the observed $\gamma$ rays in a structure consistent with capture $\gamma$-ray studies. Owing to the high conversion coefficients for low energy $\gamma$ rays a complete decay scheme has not been confirmed for ${}_{}{}^{154}{}_{}{}^{}\mathrm{Eu}_{}^m{}_{}{}^{}$.