Observation of the UCN upscattering at the artificially generated surface acoustic waves
The problem of neutron diffraction by a travelling wave has a rather long history. Probably, it was firstly discussed in 1975 by I.M. Frank in connection with the so-called UCN storage anomaly. Recently, this problem has been analyzed theoretically for the case of waves travelling at the surface of a liquids. However, UCN diffraction by surface waves was never observed in a direct experiment and it is necessary to meet this gap. Travelling waves at the surface of matter arise due to periodic oscillation of atoms, which are moving up and down mainly in the direction perpendicular to the surface. For the typical amplitudes (1 nm) and frequencies (tens of MHz) of surface acoustic waves the local acceleration of the surface riches the giant value 10^(7)g. Some arguments were published that in the case of giant acceleration, the concept of an effective potential may not be valid for UCN but correct for cold and thermal neutrons. All this makes the experiment for the observation of UCN upscattering at surface acoustic waves much more important.
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KULIN German; FRANK Alexander I; GELTENBORT Peter; GORYUNOV Semen; JENKE Tobias; JENTSCHEL Michael; J.E. Lorenzo; ORTEGA Luc and ROCCIA Stephanie. (2018). Observation of the UCN upscattering at the artificially generated surface acoustic waves. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.3-14-386