Abstract
An experiment has been performed to test some of the predictions of a recent theory of neutron scattering by liquids proposed by Vineyard. Neutrons of 0.0685 ev were scattered at 90 degrees by lead at 250\ifmmode^\circ\else\textdegree\fi{}, 330\ifmmode^\circ\else\textdegree\fi{}, and 550\ifmmode^\circ\else\textdegree\fi{}C, and the widths at half maximum of the energy distributions were determined. The width at 250\ifmmode^\circ\else\textdegree\fi{}C for solid lead was obtained for comparison purposes and found to be slightly narrower than would be predicted for a perfect gas model. The results for liquid lead show (1) that the simple diffusion model gives a slightly broader distribution than is observed for neutrons scattered by lead near the melting point and (2) that this model predicts a much larger variation of the width with temperature than is observed experimentally.
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