Neutron reflection from the surface of normal and superfluid 4He

Details Neutron reflection from the surface of normal and superfluid 4He Neutron reflection from the surface of normal and superfluid 4He

2007-12-05

arxiv.org/abs/0712.0745v1

Physics

Condensed Matter

Soft Condensed Matter

to be published in Low Temperature Physics

Scientific paper

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 also observe a surface layer ~200 Angstroms 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.

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