Sensitivity of peak positions to flight-path parameters in a deep-inelastic scattering neutron TOF spectrometer

Gray, E.MacA, Chatzidimitriou-Dreismann, C.A., & Blach, T.P. (2012) Sensitivity of peak positions to flight-path parameters in a deep-inelastic scattering neutron TOF spectrometer. Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment, 661(1), pp. 64-69.

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The effects of small changes in flight-path parameters (primary and secondary flight paths, detector angles), and of displacement of the sample along the beam axis away from its ideal position, are examined for an inelastic time-of-flight (TOF) neutron spectrometer, emphasising the deep-inelastic regime. The aim was to develop a rational basis for deciding what measured shifts in the positions of spectral peaks could be regarded as reliable in the light of the uncertainties in the calibrated flight-path parameters. Uncertainty in the length of the primary or secondary flight path has the least effect on the positions of the peaks of H, D and He, which are dominated by the accuracy of the calibration of the detector angles. This aspect of the calibration of a TOF spectrometer therefore demands close attention to achieve reliable outcomes where the position of the peaks is of significant scientific interest and is discussed in detail. The corresponding sensitivities of the position of peak of the Compton profile, J(y), to flight-path parameters and sample position are also examined, focusing on the comparability across experiments of results for H, D and He. We show that positioning the sample to within a few mm of the ideal position is required to ensure good comparability between experiments if data from detectors at high forward angles are to be reliably interpreted.

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ID Code: 58924
Item Type: Journal Article
Refereed: Yes
Keywords: Inelastic neutron scattering, Neutron Compton scattering, Time-of-flight, Calibration
DOI: 10.1016/j.nima.2011.09.025
ISSN: 0168-9002
Subjects: Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > OTHER PHYSICAL SCIENCES (029900) > Synchrotrons; Accelerators; Instruments and Techniques (029904)
Divisions: Current > Institutes > Institute for Future Environments
Deposited On: 04 Apr 2013 22:07
Last Modified: 30 Oct 2013 03:45

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