Neutron Diffraction by Gases

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Abstract
The methods developed in the previous paper for the treatment of neutron scattering by simplified molecular models are extended to form a unified description of scattering by real molecules. The generalization takes into account the influence on scattering of the interactions that appear among the different molecular degrees of freedom. The effect of spin correlations within molecules due to symmetries occurring in the presence of like nuclei is explicitly determined. The slow-neutron cross section of methane is calculated and compared with experiment.