Abstract
A surprising observation of the anomalous deep inelastic neutron scattering from liquid H 2O–D 2O mixtures was reported recently in PRL. It has also been suggested that such anomalous scattering can manifest itself as a deviation of the neutron scattering length density Nb from the conventional theory, based upon the assumption that the molecular volumes of the constituents are additive in the mixture. For H 2O–D 2O mixtures deviations as much as 5–10% are predicted from the conventionally expected value Nb. This fact would result in serious consequences for the widely used technique of contrast variation in neutron scattering. We have used an advanced neutron interferometry technique in order to verify these predictions and confirmed the experimental practice of isotopic contrast variation with high precision.
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