Experimental search for double-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>β</mml:mi></mml:math>decay of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow/><mml:mrow><mml:mn>100</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>Mo

No evidence for the neutrinoless double-$\ensuremath{\beta}$ decay of ${}^{100}$Mo has been found in a search using a segmented Si(Li) detector with source foils enriched to 97% ${}^{100}$Mo. From an exposure of 0.2664 mole years, and using Bayesian statistics to calculate confidence levels, we find a 68% lower limit on the half-life for the ${J}^{p}{=0}^{+}\ensuremath{\rightarrow}{0}^{+}$ transition of $0.22\ifmmode\times\else\texttimes\fi{}{10}^{23}$ yr. The measured half-life of the two neutrino double-$\ensuremath{\beta}$ decay is ${0.76}_{\ensuremath{-}0.14}^{+0.22}\ifmmode\times\else\texttimes\fi{}{10}^{19}$ yr.