Neutron reflection from a liquid helium surface

Neutron reflection from a liquid helium surface

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

Тема: Жидкий гелий

Інший ID: PACS: 68.03.–g;67.25.D–;61.05.F–

URI: http://dspace.nbuv.gov.ua/handle/123456789/116905

Посилання: Neutron reflection from a liquid helium surface / T.R. Charlton, R.M. Dalgliesh, A. Ganshin, O. Kirichek, S. Langridge, P.V.E. McClintock // Физика низких температур. — 2008. — Т. 34, № 4-5. — С. 400–403. — Бібліогр.: 28 назв. — англ.

Підтримка: We gratefully acknowledge help from the ISIS sample environment group.

Дата: 2008

Завантажень: 529

Neutron reflection from a liquid helium surface

Анотація:

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 Å 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. The application of neutron reflectometry described in this paper creates new and exciting opportunities for the surface and interfacial study of quantum fluids.

Показати повний запис статті