Neutron reflection from the surface of normal and superfluid 4He
Soft Condensed Matter
2007-12-06 v1 Other Condensed Matter
Abstract
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.
Keywords
Cite
@article{arxiv.0712.0745,
title = {Neutron reflection from the surface of normal and superfluid 4He},
author = {T. R. Charlton and R. M. Dalgliesh and A. Ganshin and O. Kirichek and S. Langridge and P. V. E. McClintock},
journal= {arXiv preprint arXiv:0712.0745},
year = {2007}
}
Comments
to be published in Low Temperature Physics