No evidence for the neutrinoless double-β decay of ${}_{}{}^{100}{}_{}{}^{}\mathrm{Mo}$ has been found in a search using a segmented Si(Li) detector with source foils enriched to 97% ${}_{}{}^{100}{}_{}{}^{}\mathrm{Mo}$. After 0.2664 mole years of exposure, we report a 1σ lower limit on the half-life for the ${\mathit{J}}^{\mathit{P}}$=$0^{+}$→$0^{+}$ transition of 0.44×${10}^{23}$ years.

• Received 25 February 1993

DOI:https://doi.org/10.1103/PhysRevLett.71.831