Abstract
A model of the capture and transfer of negative pions in mixtures of ${\mathrm{H}}_{2}$O and ${\mathrm{D}}_{2}$O is described. It is shown that the probability of pion transfer from hydrogen to deuterium that has been extracted from data on charge-exchange probabilities in several recent experiments should be reinterpreted as a combination of the hydrogen-to-deuterium and hydrogen-to-oxygen transfer probabilities. This explains a discrepancy between the results for the pion-transfer probabilities in mixtures of ${\mathrm{H}}_{2}$O and ${\mathrm{D}}_{2}$O and the transfer probabilities extracted from data on pion capture in mixtures of ${\mathrm{H}}_{2}$ and ${\mathrm{D}}_{2}$.
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