Redetermination of the Decay Energy ofBa133

We have redetermined the $\frac{L_1}{K}$ electron capture ratio for the decay of ${\mathrm{Ba}}^{133}$ to the 437-keV level of ${\mathrm{Cs}}^{133}$ using a modified version of the sum-coincidence technique. The $L$ and $K$ x-ray intensities following electron capture were measured in coincidence with the 437-keV sum peak arising from the coincidence summing of the 356-81-keV $\gamma$ cascade in ${\mathrm{Cs}}^{133}$. The measured $\frac{L_1}{K}$ ratio of 0.67±0.15 leads to a decay energy of ${62}_{-3.7\mathrm{}}^{+6.8\mathrm{}}$ keV to the 437-keV level. This value is closer to the recent determination of Schulz than to the earlier ones.