Abstract
We have studied the effects of a traveling surface acoustic wave (SAW) disturbance on symmetric Bragg case neutron diffraction from a perfect crystal of lithium niobate. Generally, the reflectivity is increased as the SAW distortion creates an effective moving mosaic crystal in the near surface region. Unlike the corresponding x-ray situation in which the crystalline distortion is effectively stationary, thermal neutron and SAW velocities are comparable. Thus the interaction between the neutron and the coherent SAW phonons involves significant Doppler effects that also modify the reflected neutron intensity. While the observed effects can be explained qualitatively, as yet no quantitative picture exists of the interaction between the neutron and the coherent surface phonons in this situation. {copyright} {ital 1999} {ital The American Physical Society}
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