Abstract
Effect of neutron-optic spin rotation in a noncentrosymmetric crystal was experimentally observed. The effect is caused by Schwinger interaction between the moving neutron and an interplanar electric field in the noncentrosymmetric crystal and depends on the direction and energy of the neutron. For an α-quartz crystal it is shown that the value of the effect can reach (1-2)×10-4 rad/cm in a broad band of neutron wavelengths and is restricted by the energy dispersion of the beam. The measured effect compares well to the theoretical one.
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