Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume 480, Issue 2-3, Pages 680-689Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0168-9002(01)00953-6
Keywords
neutron compton scattering; deep inelastic neutron scattering; momentum distributions; electron volt spectrometer; calibration
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The electron Volt Spectrometer (eVS) is an inverse geometry filter difference spectrometer that has been optimised to measure the single atom properties of condensed matter systems using a technique known as Neutron Compton Scattering (NCS) or Deep Inelastic Neutron Scattering (DINS). The spectrometer utilises the high flux of epithermal neutrons that are produced by the ISIS neutron spallation. source enabling the direct measurement of atomic momentum distributions and ground state kinetic energies. In this paper the procedure that is used to calibrate the spectrometer is described. This includes details of the method used to determine detector positions and neutron flight path lengths as well as the determination of the instrument resolution. Examples of measurements on 3 different samples are shown, ZrH2, He-4 and Sn which show the self-consistency of the calibration procedure. (C) 2002 Elsevier Science B.V. All rights reserved.
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