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

    Author(s)
    Gray, E MacA
    Chatzidimitriou-Dreismann, CA
    Blach, TP
    Griffith University Author(s)
    Gray, Evan M.
    Blach, Tomasz P.
    Year published
    2012
    Metadata
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    Abstract
    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 ...
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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 fewmmof 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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    Journal Title
    Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
    Volume
    661
    Issue
    1
    DOI
    https://doi.org/10.1016/j.nima.2011.09.025
    Subject
    Atomic and Molecular Physics
    Astronomical and Space Sciences
    Atomic, Molecular, Nuclear, Particle and Plasma Physics
    Other Physical Sciences
    Publication URI
    http://hdl.handle.net/10072/47725
    Collection
    • Journal articles

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