Neutron Reflection from the Surface of Liquid 4He with and without a Layer of 3He

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dc.creatorCharlton, T. R.
dc.creatorDalgliesh, R. M.
dc.creatorGanshin, A.
dc.creatorKirichek, O.
dc.creatorLangridge, S.
dc.creatorMcClintock, P. V. E.
dc.date2008-11-19
dc.date.accessioned2026-07-07T10:19:31Z
dc.date.available2026-07-07T10:19:31Z
dc.descriptionWe report and discuss the first neutron reflection measurements from the free surface of normal and superfluid 4He and of liquid 3He-4He mixture. In case of liquid 4He the surface roughness is different above and below the lambda transition, being smoother in the superfluid state. For the superfluid, we also observe the formation of a surface layer ~200 A thick which has a subtly different neutron scattering cross-section. The results can be interpreted as an enhancement of Bose-Einstein condensate fraction close to the helium surface. We find that the addition of 3He isotopic impurities leads to the formation of Andreev levels at low temperatures.
dc.descriptionLT25
dc.identifierhttps://arxiv.org/abs/0811.3141
dc.identifierhttp://arxiv.org/abs/0811.3141
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/174536
dc.subjectOther Condensed Matter
dc.titleNeutron Reflection from the Surface of Liquid 4He with and without a Layer of 3He
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