Charlton, T.R.; Dalgliesh, R.M.; Ganshin, A.; Kirichek, O.; Langridge, S.; McClintock, P.V.E.
(Физика низких температур, 2008)
The reflection of neutrons from a helium surface has been observed for the first time. The ⁴He surface is
smoother in the superfluid state at 1.54 K than in the case of the normal liquid at 2.3 K. In the superfluid state
we ...