Observation of neutron diffraction by a surface acoustic wave
Unlike the usual diffraction by a stationary object, neutron diffraction on a travelling surface wave is an essentially non-stationary process resulting in transfer of energy to the neutron. Experiments on neutron diffraction by SAW may be considered not only as a clear demonstration of the non-stationary quantum effect and a test of the quantum mechanics predictions. SAW arise due to periodical oscillation of the near-surface layer of matter that moves with alternative velocity and acceleration. For a SAW with a frequency of tens MHz this acceleration reaches a value of 10^(7)g. Since the theory of neutron diffraction by a surface wave is based on the concept of the effective potential of matter, comparison of the experimental data with the calculations is a sensitive test of the validity of this concept in the case of large accelerations. That is particularly true for the measurement of the dependence of diffraction orders intensities on the wavelength.We propose to perform a reflectometric experiment in the TOF mode to detect non-specular reflected waves arising due to neutron diffraction on travelling and standing waves.
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KULIN German; FRANK Alexander I; GUTFREUND Philipp; KHAYDUKOV Yury and ORTEGA Luc. (2020). Observation of neutron diffraction by a surface acoustic wave. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.3-15-93
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