Abstract
The momentum distributionn(p) of atoms in condensed matter may be determined from neutron inelastic scattering measurements. However, scattering at high momentum transfers ħQ (high enough that the impulse approximation holds) is required. A model of solid helium is used to assess the error introduced inn(p) by assuming the impulse approximation holds at severalQ values. AtQ=20 Å−1 the error inn(p) is ≈5–10%. This error can be reduced by a factor of ten using a symmetrization procedure.
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Tanatar, B., Lefever, G.C. & Glyde, H.R. Momentum distributions and the impulse approximation in helium. J Low Temp Phys 62, 489–496 (1986). https://doi.org/10.1007/BF00683406
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DOI: https://doi.org/10.1007/BF00683406