Neutron reflection from the surfaces of liquid 4He and a Dilute 3He - 4He solution

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

doi:10.1088/1742-6596/150/3/032022

Neutron reflection from the surfaces of liquid ⁴He and a Dilute ³He - ⁴He solution

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

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

We report and discuss the first neutron reflection measurements from the free surfaces of normal and superfluid ⁴He and of a 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 thick which has a subtly different neutron scattering cross-section. The results can be interpreted as an enhancement of the 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.

Original language	English
Article number	032022
Journal	Journal of Physics: Conference Series
Volume	150
Issue number	3
DOIs	https://doi.org/10.1088/1742-6596/150/3/032022
State	Published - 2009
Externally published	Yes

Access to Document

10.1088/1742-6596/150/3/032022

Cite this

@article{41296f82590d40d39e30b419b1ebdc41,

title = "Neutron reflection from the surfaces of liquid 4He and a Dilute 3He - 4He solution",

abstract = "We report and discuss the first neutron reflection measurements from the free surfaces of normal and superfluid 4He and of a 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 thick which has a subtly different neutron scattering cross-section. The results can be interpreted as an enhancement of the 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.",

author = "Charlton, {T. R.} and Dalgliesh, {R. M.} and Ganshin, {A. N.} and O. Kirichek and S. Langridge and McClintock, {P. V.E.}",

year = "2009",

doi = "10.1088/1742-6596/150/3/032022",

language = "English",

volume = "150",

journal = "Journal of Physics: Conference Series",

issn = "1742-6588",

number = "3",

}

TY - JOUR

T1 - Neutron reflection from the surfaces of liquid 4He and a Dilute 3He - 4He solution

AU - Charlton, T. R.

AU - Dalgliesh, R. M.

AU - Ganshin, A. N.

AU - Kirichek, O.

AU - Langridge, S.

AU - McClintock, P. V.E.

PY - 2009

Y1 - 2009

N2 - We report and discuss the first neutron reflection measurements from the free surfaces of normal and superfluid 4He and of a 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 thick which has a subtly different neutron scattering cross-section. The results can be interpreted as an enhancement of the 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.

AB - We report and discuss the first neutron reflection measurements from the free surfaces of normal and superfluid 4He and of a 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 thick which has a subtly different neutron scattering cross-section. The results can be interpreted as an enhancement of the 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.

UR - http://www.scopus.com/inward/record.url?scp=77952517661&partnerID=8YFLogxK

U2 - 10.1088/1742-6596/150/3/032022

DO - 10.1088/1742-6596/150/3/032022

M3 - Article

AN - SCOPUS:77952517661

SN - 1742-6588

VL - 150

JO - Journal of Physics: Conference Series

JF - Journal of Physics: Conference Series

IS - 3

M1 - 032022

ER -

Neutron reflection from the surfaces of liquid ⁴He and a Dilute ³He - ⁴He solution

Abstract

Access to Document

Other files and links

Fingerprint

Cite this