Abstract
Spin-echo small-angle neutron scattering (SESANS) allows structural measurements from 10s of nanometers out to 10s of micrometers, significantly broader than conventional small-angle neutron scattering (SANS). This is achieved by encoding the scattering angle into the Larmor phase of neutron spin. Multiple SESANS instruments have been developed, each employing distinct methods and devices. Using two solid samples, a porous alumina membrane and a flexible graphite sheet, we have determined the normalized scattering correlation functions of the samples at the SESANS instruments at the ISIS Neutron and Muon Source (Larmor instrument), the Oak Ridge National Laboratory High-Flux Isotope Reactor (HFIR), and the TU Delft Reactor Institute Delft (RID). Spin-echo lengths were measured up to ~500 nm for ORNL HFIR, up to ~3000 nm for TU Delft, and up to ~4000 nm for ISIS Larmor measurements. The three sets of data show good agreement over the whole range of spin-echo lengths, despite the differences in how they perform SESANS measurements. This comparison shows the robustness and accuracy of each setup and that the SESANS technique is able to produce reliable and reproducible data.
