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Low energy upscattering of UCN in interaction with the surface of solid state

A. Serebrov·A. Vassiljev·M. Lasakov·I. Krasnoschekova·A. Fomin·P. Geltenbort·E. Siber
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Abstract

In connection with the problem of anomalous losses of ultracold neutrons (UCN) in the storage in the material traps the measurements of quasi-elastic scattering of UCN in collisions with trap surface have been carried out. It was observed that the probability of quasi-elastic scattering of UCN from energy interval 0-77 neV to 90-200 neV is (2.2+/-0.2)*10^-8 per collision therefore the process of quasi-elastic scattering can not explain the effect of anomalous losses which is on the level 3*10^-5.

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A. Serebrov, A. Vassiljev, M. Lasakov, I. Krasnoschekova, A. Fomin, P. Geltenbort, E. Siber. 2006-11-22. Low energy upscattering of UCN in interaction with the surface of solid state. https://doi.org/10.1016/j.physleta.2007.03.079

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