Abstract
The dispersion (resonance) behavior of the refractive index of a neutron moving in a crystal with energies close to Bragg values has been studied. It has been shown that a small change in the energy of the neutron by about the Bragg width in this case (ΔE/E ∼ 10−5) results in a significant (several tens of percent) change in the potential of the interaction of the neutron with the crystal. A new phenomenon—the acceleration of the neutron passing through a perfect crystal moving at a variable velocity near a Bragg resonance—has been observed. The effect appears because the parameter of deviation from the Bragg condition and, therefore, the neutron-crystal interaction potential change during the time of flight of the neuron through the accelerated crystal. As a result, the kinetic energy of the neutron leaving the crystal changes.
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Original Russian Text © V.V. Voronin, Ya.A. Berdnikov, A.Ya. Berdnikov, Yu.P. Braginetz, E.O. Vezhlev, I.A. Kuznetsov, M.V. Lasitsa, S.Yu. Semenikhin, V.V. Fedorov, 2014, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2014, Vol. 100, No. 8, pp. 555–560.
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Voronin, V.V., Berdnikov, Y.A., Berdnikov, A.Y. et al. Dispersion of the refractive index of a neutron in a crystal. Jetp Lett. 100, 497–502 (2014). https://doi.org/10.1134/S0021364014200132
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DOI: https://doi.org/10.1134/S0021364014200132