This article is cited in 4 papers

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On the possibility of a significant increase in the storage time of ultracold neutrons in traps coated with a liquid helium film

P. D. Grigor'ev^ab, A. M. Dyugaev^b, T. I. Mogilyuk^c, A. D. Grigor'ev

^a National University of Science and Technology «MISIS», Moscow
^b L.D. Landau Institute for Theoretical Physics of Russian Academy of Sciences
^c National Research Centre "Kurchatov Institute", Moscow

Abstract: It is shown that rough inner walls of a trap of ultracold neutrons can be coated with a superfluid helium film much thicker than the depth of penetration of ultracold neutrons into helium. This coating should reduce the rate of loss of ultracold neutrons caused by absorption in the walls of the trap by orders of magnitude. It is demonstrated that triangular roughness is more efficient than rectangular for the reduction of the rate of loss of ultracold neutrons. Triangular roughness is more easily implemented technically and such diffraction gratings are fabricated industrially. Other methods are proposed to increase the thickness of the protective helium film.

Received: 20.09.2021
Revised: 23.09.2021
Accepted: 23.09.2021

DOI: 10.31857/S1234567821200106

 English version: Journal of Experimental and Theoretical Physics Letters, 2021, 114:8, 493–499

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