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Neutron reflection from the surface of a liquid 4He- 3He mixture

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Neutron reflection from the surface of a liquid 4He- 3He mixture. / Kirichek, O.; Vasilev, N. D.; Charlton, T. R. et al.
In: Journal of Physics: Conference Series, Vol. 400, No. 1, 012033, 01.01.2012.

Research output: Contribution to Journal/MagazineConference articlepeer-review

Harvard

Kirichek, O, Vasilev, ND, Charlton, TR, Kinane, CJ, Dalgliesh, RM, Ganshin, A, Langridge, S & McClintock, PVE 2012, 'Neutron reflection from the surface of a liquid 4He- 3He mixture', Journal of Physics: Conference Series, vol. 400, no. 1, 012033. https://doi.org/10.1088/1742-6596/400/1/012033

APA

Kirichek, O., Vasilev, N. D., Charlton, T. R., Kinane, C. J., Dalgliesh, R. M., Ganshin, A., Langridge, S., & McClintock, P. V. E. (2012). Neutron reflection from the surface of a liquid 4He- 3He mixture. Journal of Physics: Conference Series, 400(1), Article 012033. https://doi.org/10.1088/1742-6596/400/1/012033

Vancouver

Kirichek O, Vasilev ND, Charlton TR, Kinane CJ, Dalgliesh RM, Ganshin A et al. Neutron reflection from the surface of a liquid 4He- 3He mixture. Journal of Physics: Conference Series. 2012 Jan 1;400(1):012033. doi: 10.1088/1742-6596/400/1/012033

Author

Kirichek, O. ; Vasilev, N. D. ; Charlton, T. R. et al. / Neutron reflection from the surface of a liquid 4He- 3He mixture. In: Journal of Physics: Conference Series. 2012 ; Vol. 400, No. 1.

Bibtex

@article{0276f6bbd29f4e61bf5acfd0241cb9b7,
title = "Neutron reflection from the surface of a liquid 4He- 3He mixture",
abstract = "We have used neutron reflection from the liquid surface at ultra-low temperatures to study the surface properties of liquid helium. We measured neutron scattering from the free surfaces of commercially pure 4He (0.3 ppm of 3He impurities) and of a 3He-4He mixture with a 3He concentration of 0.5% for temperatures in the range from 340mK to 2.2K We compare the reflected neutron intensity for different temperatures and we fit a model that describes the collected data. The data are described well by a diffusive 3He layer of a few hundred Angstrom thickness on the bulk 4He liquid surface. Even at high temperatures (∼2K) there is an increased concentration of 3He atoms near the liquid surface. The distribution does not change very much with temperature. At low temperatures the neutron absorption increases significantly, which might be an indication of the formation of Andreev states. However, the shapes of the curves do not change very much which seems to suggest that the layer formed by the 3He atoms in Andreev states is very thin ∼ 10{\AA}. The experimental method, based on neutron reflectometry, opens up new opportunities for the study of the surfaces and interfaces of quantum fluids and solids.",
author = "O. Kirichek and Vasilev, {N. D.} and Charlton, {T. R.} and Kinane, {C. J.} and Dalgliesh, {R. M.} and A. Ganshin and S. Langridge and McClintock, {P. V.E.}",
year = "2012",
month = jan,
day = "1",
doi = "10.1088/1742-6596/400/1/012033",
language = "English",
volume = "400",
journal = "Journal of Physics: Conference Series",
issn = "1742-6588",
publisher = "IOP Publishing Ltd.",
number = "1",
note = "26th International Conference on Low Temperature Physics, LT 2011 ; Conference date: 10-08-2011 Through 17-08-2011",

}

RIS

TY - JOUR

T1 - Neutron reflection from the surface of a liquid 4He- 3He mixture

AU - Kirichek, O.

AU - Vasilev, N. D.

AU - Charlton, T. R.

AU - Kinane, C. J.

AU - Dalgliesh, R. M.

AU - Ganshin, A.

AU - Langridge, S.

AU - McClintock, P. V.E.

PY - 2012/1/1

Y1 - 2012/1/1

N2 - We have used neutron reflection from the liquid surface at ultra-low temperatures to study the surface properties of liquid helium. We measured neutron scattering from the free surfaces of commercially pure 4He (0.3 ppm of 3He impurities) and of a 3He-4He mixture with a 3He concentration of 0.5% for temperatures in the range from 340mK to 2.2K We compare the reflected neutron intensity for different temperatures and we fit a model that describes the collected data. The data are described well by a diffusive 3He layer of a few hundred Angstrom thickness on the bulk 4He liquid surface. Even at high temperatures (∼2K) there is an increased concentration of 3He atoms near the liquid surface. The distribution does not change very much with temperature. At low temperatures the neutron absorption increases significantly, which might be an indication of the formation of Andreev states. However, the shapes of the curves do not change very much which seems to suggest that the layer formed by the 3He atoms in Andreev states is very thin ∼ 10Å. The experimental method, based on neutron reflectometry, opens up new opportunities for the study of the surfaces and interfaces of quantum fluids and solids.

AB - We have used neutron reflection from the liquid surface at ultra-low temperatures to study the surface properties of liquid helium. We measured neutron scattering from the free surfaces of commercially pure 4He (0.3 ppm of 3He impurities) and of a 3He-4He mixture with a 3He concentration of 0.5% for temperatures in the range from 340mK to 2.2K We compare the reflected neutron intensity for different temperatures and we fit a model that describes the collected data. The data are described well by a diffusive 3He layer of a few hundred Angstrom thickness on the bulk 4He liquid surface. Even at high temperatures (∼2K) there is an increased concentration of 3He atoms near the liquid surface. The distribution does not change very much with temperature. At low temperatures the neutron absorption increases significantly, which might be an indication of the formation of Andreev states. However, the shapes of the curves do not change very much which seems to suggest that the layer formed by the 3He atoms in Andreev states is very thin ∼ 10Å. The experimental method, based on neutron reflectometry, opens up new opportunities for the study of the surfaces and interfaces of quantum fluids and solids.

U2 - 10.1088/1742-6596/400/1/012033

DO - 10.1088/1742-6596/400/1/012033

M3 - Conference article

AN - SCOPUS:84873632603

VL - 400

JO - Journal of Physics: Conference Series

JF - Journal of Physics: Conference Series

SN - 1742-6588

IS - 1

M1 - 012033

T2 - 26th International Conference on Low Temperature Physics, LT 2011

Y2 - 10 August 2011 through 17 August 2011

ER -