Slow-neutron scattering by molecules

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Abstract
An approximate evaluation is made for the slow-neutron scattering law for rigid diatomic molecules by a method which is subject to generalization. Our most approximate result for the self-scattering terms is identical to the result obtained by Krieger and Nelkin [14] and may be expressed in terms of the Sachs and Teller [13] mass tensor. The result for the interference terms is novel and shows that the effective mass for these terms is usually comparable to the molecular mass, which is physically reasonable. The results can readily be used to evaluate Placzek corrections [6, 10]. The method is generalized to non-rigid diatomic molecules in the following paper [7].