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

No evidence for the neutrinoless double-\ensuremath{\beta} 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 1\ensuremath{\sigma} lower limit on the half-life for the ${\mathit{J}}^{\mathit{P}}$=${0}^{+}$\ensuremath{\rightarrow}${0}^{+}$ transition of 0.44\ifmmode\times\else\texttimes\fi{}${10}^{23}$ years.