Speaker
Description
The open-source toolkit NCrystal provides the scattering physics of low-energy neutrons for a variety of materials, including single- and poly-crystals, amorphous solids, liquids and gases. Additionally, NCrystal supports the plugin feature for implementing custom physical models. Furthermore, it can be used as a backend by Monte Carlo codes to model neutron scattering experiments. These capabilities, coupled with continuous development, have made NCrystal a widely used tool for analyzing scattering experimental data.
In this presentation, we showcase the use of NCrystal for analyzing quantitatively inelastic scattering, transmission and imaging experiments. This includes a comprehensive modelling of magnetic neutron scattering of O$_2$-containing clathrate hydrate which can potentially be used as moderator material for cold and very cold neutron production. Another example is the analysis of neutron transmission experiment of beryllium metal performed at the HIPPO instrument (LANL). We focus on the implementation of the extinction models which resolves the cross-section discrepancies of beryllium compared to using the ideal polycrystalline assumption. Furthermore, we present a recently-developed data analysis pipeline dedicated to quantifying spatially low concentrations of hydrogen in metallic alloys using wavelength-resolved neutron imaging. The method was validated through imaging experiments performed at the IMAT (ISIS) and RADEN (J-PARC) beamlines on super duplex stainless steel (SDSS) samples covered with thin polyethylene layers to mimic controlled hydrogen signals.