A. I. Frank, P. Geltenbort, M. Zhentshel', G. V. Kulin, D. V. Kustov, V. G. Nosov, A. N. Strepetov, “New gravitational experiment with ultracold neutrons”, Pis'ma v Zh. Èksper. Teoret. Fiz., 86:4 (2007), 255–259; JETP Letters, 86:4 (2007), 225

Abstract: The results of a new neutron gravitation experiment are reported. The change in the energy of a neutron falling to a known height in the Earth’s gravitational field is compensated by an energy quantum ħΘ transferred to the neutron as a result of the phase modulation of the neutron wave. A phase diffraction grating moving across the direction of the propagation of the neutron wave is used as a modulator. The experiment has been carried out with ultracold neutrons Interference filters, neutron analogues of Fabry-Perot interferometers, are used for the spectrometry of ultracold neutrons. The force m _g g _n acting on the neutron in the Earth’s gravitational field has been measured with an accuracy of about 0.2%.

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