Abstract
The neutron velocity selector of the Cavendish Laboratory has been used to investigate the variation of the scattering of slow neutrons with the temperature of the scatterer. Results have been obtained for nickel and magnesium. Weinstock, in a theoretical treatment of this scattering, considers processes in which the neutron exchanges one or no phonons with the vibrations of the crystal lattice. The measured values of the cross-sections are found to be greater than those given by Weinstock’s theory, the discrepancy reaching 30 % for magnesium at 625° K. A method of calculating the cross-sections for processes involving the exchange of more than one phonon is given in this paper, and it is shown that when these cross-sections are added to those given by Weinstock’s theory, the results agree with experiment to within 4 %.
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