Radioactive decay of 47-min 154Eum

A 47-min isomer has been identified in ¹⁵⁴Eu. Sources were prepared in (n,γ) and (d,p), (d,2n) and (p,n), and (d,α) reactions on Eu, Sm, and Gd, respectively, and in each case the 47-min activity followed the Eu fraction in the separation of EuSO₄. Singles and coincidence γ-ray studies confirmed a number of the observed γ rays in a structure consistent with capture γ-ray studies. Owing to the high conversion coefficients for low energy γ rays a complete decay scheme has not been confirmed for ¹⁵⁴Eu^m. RADIOACTIVITY ¹⁵⁴Eu^m; measured T₁₂, E_γ, I_γ, γγ coin, deduced levels, J, π. Enriched targets. Ge(Li) and Si(Li) detectors, 170 eV at 5.9 keV.