DOE OSTI · 2573457
Data Reproducibility of Spin-Echo Small-Angle Neutron Scattering Instruments
Abstract
Spin-echo small-angle neutron scattering (SESANS) is a unique method to measure structures of materials in real space with length scales from ∼ 30 μm to ∼20 µm. As shown in Figure 1, the accessible length scale of SESANS is given by its ability to encode the momentum transfer into the Larmor phase, namely Φ = $\vec{𝛿}$ ⋅ $\vec{𝑄}$, where $\vec{𝑄}$ is the momentum transfer and $\vec{𝛿}$ is the encoding vector of the setup and its projection along Q (δQ) is called spin-echo length (SEL). The spin echo length, which is synonymous with the spatial correlation distance probed, is defined as the following 𝛿𝑄 ∝ 𝜆 2 𝐵𝐿cot𝜃 where 𝜆 is neutron wavelength, B is magnetic field, L is length of the parallelogram magnetic field region, and 𝜃 is the angle between the inclined magnetic field boundary and the beam direction, as shown in Figure 1. The result of the SESANS experiment is a Hankel transformation of the SANS scattering function I(Q), which yields the correlation function of the sample in real space.
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Funama, Fumiaki [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)] (ORCID:0000000332808103), Smith, Gregory N. [Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab., ISIS Neutron Source] (ORCID:0000000200745657), Parnell, Steven R. [Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab., ISIS Neutron Source; Delft Univ. of Technology (Netherlands)] (ORCID:0000000270446257), Duif, Chris P. [Delft Univ. of Technology (Netherlands)] (ORCID:000000023263963X), Bouwman, Wim G. [Delft Univ. of Technology (Netherlands)] (ORCID:0000000253318085), Pynn, Roger [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Indiana Univ., Bloomington, IN (United States)] (ORCID:0000000208677505), Dalgliesh, Robert M. [Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab., ISIS Neutron Source] (ORCID:000000026814679X), Li, Fankang [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)] (ORCID:0000000188590102). 2025-03-11. Data Reproducibility of Spin-Echo Small-Angle Neutron Scattering Instruments. https://doi.org/10.1080/10448632.2025.2468088
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