Abstract

A sample of ${\mathrm{Os}}^{194}$ was produced by double neutron capture. The gamma-ray spectrum was measured with a NAI(Tl) scintillation spectrometer and the electron spectrum with a silicon solid-state detector. Gamma-ray photopeaks were observed at 43 and 11 keV. The latter is assumed to be the $L$ x-ray peak resulting from $L$-shell internal conversion of the 43-keV transition. The relative $L$ x-ray intensity then implies this transition has $M1$ or $E1+1.5%$ $M2$ character. The intensity of this transition relative to those in the ${\mathrm{Ir}}^{194}$ daughter indicates an intensity of almost 100% of the decays.

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