Experimental Setup for Methodological Research with Polarized Neutrons at the IR-8 Reactor

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Abstract

The results of the work on the development of an experimental setup for investigating polarized neutron methods at the IR-8 reactor are presented. A scheme for polarizing a monochromatic neutron beam and analyzing it using the Mezei spin flipper has been developed. A reflectometric scheme for measuring thin-film samples has been implemented using a beam of polarized neutrons, and the reflection coefficients of non-magnetic layers have been measured experimentally. The results obtained on the setup confirm the possibility of further implementation of several methods for studying condensed matter, including polarized neutron reflectometry, depolarization, and polarized neutron radiography. These research methods were implemented at the IR-8 reactor for the first time.

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About the authors

E. O. Serov

National Research Centre “Kurchatov Institute”

Email: savch92@gmail.com
Russian Federation, Moscow, 123182

P. S. Savchenkov

National Research Centre “Kurchatov Institute”; National Research Nuclear University MEPhI

Author for correspondence.
Email: savch92@gmail.com
Russian Federation, Moscow, 123182; Moscow, 115409

A. V. Rogachev

National Research Centre “Kurchatov Institute”

Email: savch92@gmail.com
Russian Federation, Moscow, 123182

A. I. Kalyukanov

National Research Centre “Kurchatov Institute”

Email: savch92@gmail.com
Russian Federation, Moscow, 123182

V. I. Bodnarchuk

National Research Centre “Kurchatov Institute”; Joint Institute for Nuclear Research; Dubna State University

Email: savch92@gmail.com
Russian Federation, Moscow, 123182; Dubna, 141980; Dubna, 141980

A. V. Belushkin

National Research Centre “Kurchatov Institute”; Joint Institute for Nuclear Research; Kazan Federal University

Email: savch92@gmail.com
Russian Federation, Moscow, 123182; Dubna, 141980; Kazan, 420008

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Supplementary files

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2. 1. Diagram of the neutron reflectometry stand: 1 — Cu(111) monochromator; 2 — GEK-5; 3 — GEK-5 collimator; 4 — insert into the collimator; 5 — super mirror polarizer; 6 — adjustable slit; 7 — spin flipper; 8 — sample assembly; 9 — super mirror analyzer; 10—dimensional position-sensitive detector.

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3. Fig. 2. Experimental data on determining the degree of polarization of the neutron beam: a – spin-flipper is off; b — spin-flipper is on. The symbols are experimental data, and the solid line is a model fit. The dashed (1) and dotted (2) lines correspond to the contributions of polarized neutrons and a direct neutron beam, respectively. The dotted line indicates the background.

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4. Fig. 3. The neutron reflection coefficient from the Ni/SiO2 film: the points are experimental values of the reflection coefficient; the lines are the result of fitting using the Bayesian approach and Monte Carlo simulation [11], 100 samples from the a posteriori distribution are given.

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5. 4. A posteriori distribution of the Ni layer thickness in a Ni/SiO2 film based on the results of neutron reflectometry data processing.

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