Abstract
A new way is proposed and investigated for observing and fine tuning a neutron spin rotation effect caused by the Schwinger interaction of the moving neutron with the strong interplanar electric field of the noncentrosymmetric quartz crystal. By that we have got an opportunity to control the electric field acting on neutron. The value and sign of this field depend on the deviation of a neutron energy from the Bragg one. We used a second crystal parallel to the main one for selection of the neutrons with the given deviation parameter. The possibility to control the electric field acting on the registered neutrons has been realized by heating (or cooling) the second crystal. Observed effects give a real prospects to improve essentially the scheme and sensitivity of the experiment for a search for neutron electric dipole moment (EDM) using the crystal diffraction technique.
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