Procedure for the determination of effective temperatures employing VESUVIO spectrometer

Abstract

We describe the procedure to determine effective temperatures employing the data collected by the detectors of the VESUVIO spectrometer (ISIS pulsed neutron source), employing the Deep Inelastic Neutron Scattering technique. A scheme to group the detectors is proposed, based on their positions and angular ranges, in order to add their spectra and improve the statistics. We show the details of all the corrections that must be made on the raw experimental data to reach the spectra on which the desired effective temperatures can be fitted. Most of the correction stages require ad-hoc auxiliary simulations by the Monte Carlo method, that were deviced and described in previous papers. The corrections, that involve background subtraction, empty cell subtraction, and multiple scattering corrections, are described in detail. The efficiencies of the defined detector groups are determined, and employed in the expressions used in data fitting. Data treatment steps performed in hydrogenated and deuterated alcohols, are shown as examples of application of this procedure.