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Baym's treatment of coherent scattering of slow neutrons by a crystal is examined and modified to include effects due to the cubic-anharmonic term in the lattice potential to second order in the coupling constant. Corrections to the Debye-Waller factor and to the "one-phonon" resonance peak are obtained, which appear to be negligible ({≈}0.01%) for the case of a Bravais lattice and certainly 1% in other cases.
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B. V. Thompson (1963) studied this question.
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