https://doi.org/10.1051/epjconf/202328606002
Neutron adiabaticity and its impact on data analysis, illustrated for polarized GISANS
1 Lund University, Division of Synchrotron Radiation Research, 22100 Lund, Sweden
2 European Spallation Source (ESS), Instrument Technologies Division, 22484 Lund, Sweden
3 Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS-2) and Peter Grünberg Institut (PGI-4), JARA-FIT, 52428 Juelich, Germany
4 NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
5 Department of Materials Science and Eng., University of Maryland, College Park, MD 20742-2115
* Corresponding author: annika.stellhorn@sljus.lu.se
Published online: 9 October 2023
The significance of neutron spin adiabaticity in the data analysis of polarized Grazing Incidence Small Angle Neutron Scattering (GISANS) is discussed, with the aim of minimizing the number of simulation parameters of complex magnetic models within the neutron scattering cross-section. We illustrate how an estimate of the neutron polarization direction and adiabaticity can be obtained by magnetic field and neutron ray-tracing simulations and compare the results with measurements of the magnetic field map for the beamline used in the GISANS experiment. We show how small deviations from the neutron polarization direction with respect to the magnetic field vector at the sample position significantly affect the data analysis, and how this can be considered within the magnetic model of the scattering cross section using the Distorted Wave Born Approximation.
© The Authors, published by EDP Sciences, 2023
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
