Abstract

Scattering of 59.5-keV \ensuremath{\gamma} rays from Zn, Cd, and Pb foils at angles from 3.5\ifmmode^\circ\else\textdegree\fi{} to 30\ifmmode^\circ\else\textdegree\fi{} has been measured. The influence of Bragg scattering on the determination of differential Rayleigh cross sections has been investigated. It has been shown that interference effects occur in polycrystalline targets for angles \ensuremath{\le}20\ifmmode^\circ\else\textdegree\fi{} and some care has to be taken in the measurement of Rayleigh cross sections for momentum transfer less than 2 A${\r{}}^{\mathrm{\ensuremath{-}}1}$.

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