Neutron time-of-flight reflectometer GRAINS with horizontal sample plane at the IBR-2 reactor: Possibilities and prospects


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A new time-of-flight neutron reflectometer GRAINS with a horizontal sample plane (vertical scattering plane) has recently been put into operation at the pulsed reactor IBR-2 (JINR, Dubna). The scattering geometry applied makes it possible to carry out complex studies of nanostructured interfaces in solid and liquid states by measuring the specular reflectivity and the intensity of diffuse scattering of thermal neutrons from open surfaces and hidden interlayer boundaries, including solid-liquid interfaces, over a wide momentum transfer range. The classical analysis of specular reflectivity allows one to determine the scattering length density profile in the object under study in a direction perpendicular to the interface for a thickness of ~100 nm with a resolution of 1 nm. The analysis of off-specular (diffuse) neutron scattering makes it possible to characterize lateral correlations on surfaces and interlayer boundaries. The paper summarizes the first experience in the operation of the GRAINS reflectometer. The instrument characteristics are presented together with the possibilities for experiments with solid and liquid samples illustrated with simple systems. Further steps for the development of the reflectometer are discussed.

Sobre autores

M. Avdeev

Frank Laboratory of Neutron Physics

Autor responsável pela correspondência
Email: avd@nf.jinr.ru
Rússia, Dubna, Moscow oblast

V. Bodnarchuk

Frank Laboratory of Neutron Physics

Email: avd@nf.jinr.ru
Rússia, Dubna, Moscow oblast

V. Petrenko

Frank Laboratory of Neutron Physics; Taras Shevchenko National University of Kyiv

Email: avd@nf.jinr.ru
Rússia, Dubna, Moscow oblast; Kyiv

I. Gapon

Frank Laboratory of Neutron Physics; Taras Shevchenko National University of Kyiv

Email: avd@nf.jinr.ru
Rússia, Dubna, Moscow oblast; Kyiv

O. Tomchuk

Frank Laboratory of Neutron Physics; Taras Shevchenko National University of Kyiv

Email: avd@nf.jinr.ru
Rússia, Dubna, Moscow oblast; Kyiv

A. Nagorny

Frank Laboratory of Neutron Physics; Taras Shevchenko National University of Kyiv

Email: avd@nf.jinr.ru
Rússia, Dubna, Moscow oblast; Kyiv

V. Ulyanov

Konstantinov Petersburg Nuclear Physics Institute

Email: avd@nf.jinr.ru
Rússia, Gatchina

L. Bulavin

Taras Shevchenko National University of Kyiv

Email: avd@nf.jinr.ru
Ucrânia, Kyiv

V. Aksenov

Frank Laboratory of Neutron Physics; Konstantinov Petersburg Nuclear Physics Institute

Email: avd@nf.jinr.ru
Rússia, Dubna, Moscow oblast; Gatchina

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