Neutron reflection from a liquid helium surface

T. R. Charlton; R. M. Dalgliesh; O. Kirichek; S. Langridge; A. Ganshin; P. V.E. McClintock

doi:10.1063/1.2908893

Neutron reflection from a liquid helium surface

T. R. Charlton, R. M. Dalgliesh, O. Kirichek, S. Langridge, A. Ganshin, P. V.E. McClintock

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7 Scopus citations

Abstract

The reflection of neutrons from a helium surface is observed for the first time. The He4 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 also observe a surface layer ∼200 Å thick which has a subtly different neutron scattering cross section, which may be explained by an enhanced Bose-Einstein condensate fraction close to the helium surface. The application of neutron reflectometry described in this paper creates new and exciting opportunities for the surface and interfacial study of quantum fluids.

Original language	English
Pages (from-to)	316-319
Number of pages	4
Journal	Low Temperature Physics
Volume	34
Issue number	4
DOIs	https://doi.org/10.1063/1.2908893
State	Published - 2008
Externally published	Yes

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10.1063/1.2908893

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AU - Charlton, T. R.

AU - Dalgliesh, R. M.

AU - Kirichek, O.

AU - Langridge, S.

AU - Ganshin, A.

AU - McClintock, P. V.E.

PY - 2008

Y1 - 2008

N2 - The reflection of neutrons from a helium surface is observed for the first time. The He4 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 also observe a surface layer ∼200 Å thick which has a subtly different neutron scattering cross section, which may be explained by an enhanced Bose-Einstein condensate fraction close to the helium surface. The application of neutron reflectometry described in this paper creates new and exciting opportunities for the surface and interfacial study of quantum fluids.

AB - The reflection of neutrons from a helium surface is observed for the first time. The He4 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 also observe a surface layer ∼200 Å thick which has a subtly different neutron scattering cross section, which may be explained by an enhanced Bose-Einstein condensate fraction close to the helium surface. The application of neutron reflectometry described in this paper creates new and exciting opportunities for the surface and interfacial study of quantum fluids.

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VL - 34

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JO - Low Temperature Physics

JF - Low Temperature Physics

IS - 4

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Neutron reflection from a liquid helium surface

Abstract

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