Abstract
The small-angle scattering of thermal neutrons from large-scale inhomogeneities of a material is considered. It is shown that the neutron-optical potential must be taken as the inhomogeneity potential both in the Born and eikonal approximations. The neutron-optical potential is the Fermi pseudopotential averaged over a volume containing many nuclei but with linear sizes much smaller than the sizes of the inhomogeneities measured.
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