We discuss extremely sensitive shifts of the interference patterns resulting from whispering-gallery and gravitational quantum states of different particles (neutrons, atoms, anti-atoms, positronium, muonium etc). These methods can be used, for instance, for measuring the gravitational constant or constraining the neutron electric charge. A series of such measurements will be made with neutrons at the PF1B/PF2/D17 facilities at the ILL, as well as with hydrogen or/and deuterium atoms by the GRASIAN collaboration in Vienna and Turku. Such a measurement with antihydrogen atoms may be of interest for the GBAR, ASACUSA or other experiments at CERN, which study the gravitational properties of antimatter. Quantum reflection of muonium and positronium from material surfaces opens the possibility of observing whispering-galley states. Measurements of whispering gallery with all these atoms and particles yield unique information on the quantum reflection properties of surfaces, providing valuable input for both fundamental and surface studies.
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Valery Nesvizhevsky
(Institut Laue-Langeven, Grenoble)
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