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The reflection of neutrons from a helium surface has been observed for thefirst time. The 4He surface is smoother in the superfluid state at 1.54 K thanin the case of the normal liquid at 2.3 K. In the superfluid state we alsoobserve a surface layer ~200 Angstroms thick which has a subtly differentneutron scattering cross-section, which may be explained by an enhancedBose-Einstein condensate fraction close to the helium surface.

Neutron reflection from the surface of normal and superfluid 4He