Precision studies of the neutron whispering gallery with a MgF2 concave mirror (continuation).
The neutron whispering gallery effect was observed with cold neutrons passing in the vicinity of a concave polished mirror. This phenomenon could be considered, within the quantum-mechanical equivalence principle, as an analog to gravitational quantum states of neutrons. An important motivation for precision studies of the neutron whispering gallery effect consists of its high sensitivity to extra spin-(in)dependent fundamental short-range interactions. With this (second in a series) proposal, we continue experiments aiming at measuring >100 lines in the whispering-gallery pattern with the uncertainty of <10% of the line separation. In the first experiment (3-15-85) with MgF2 mirror, we confirmed qualitatively the expected interference pattern and the estimated statistical sensitivity. Now we apply for beam time at D17 in order to calibrate the absolute wavelength scale (using two independent methods: a) with a compact ultra-precise time-of-flight device developed earlier for GRANIT, b) using Bragg reflection from mono-crystals). Also we will investigate quantitatively eventual false effects associated with residual impurities on surface. The mirror is available and characterized.
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NESVIZHEVSKY Valery; CUBITT Robert and ORLOVA Daria. (2018). Precision studies of the neutron whispering gallery with a MgF2 concave mirror (continuation).. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.3-15-90
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