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Abstract
New evidence of the increased count rate in deep inelastic neutron scattering spectra is provided. Experiments were performed using photon-sensitive yttrium-aluminum-perovskite detectors, installed on the VESUVIO spectrometer at the ISIS pulsed neutron and muon source. At present, these detectors work with a low-level discrimination threshold measuring photons with energy greater than 600 keV in order to avoid background photons from the boron in the beam stop, and other environmental sources. We discuss the advantage in reducing the level of the threshold so as to detect some high-intensity low-energy promptgamma rays emitted after the radiative capture of 4.9 eV neutrons by gold, used as energy analyser on the VESUVIO spectrometer. This work shows an improvement of the statistical poissonian error bars and noise on the difference of spectra recorded with and without the energy analyser. The application of such new acquisition strategy discussed here will improve the detection limit of hydrogen atoms in samples, as well as allow a more precise line-shape analysis of nuclear momentum distributions, mentioning just few applications of deep inelastic neutron scattering experiments on VESUVIO.
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Details
1 Università degli studi di Roma Tor Vergata, Dipartimento di Scienze e Tecnologie Chimiche, Via della Ricerca Scientifica 1, Rome, 00133 Italy; Universita degli studi di Roma Tor Vergata, Centro NAST, Via della Ricerca Scientifica 1, Rome, 00133 Italy
2 ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 OQX, UK; Centro Fermi - Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi”, Piazza del Viminale 1, Rome, 00184 Italy
3 Centro Fermi - Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi”, Piazza del Viminale 1, Rome, 00184 Italy; Universita degli studi di Roma Tor Vergata, Centro NAST, Via della Ricerca Scientifica 1, Rome, 00133 Italy; UCL-Institute of Archaeology, University College of London 31-34 Gordon Square London WC1H 0PY United Kingdom
4 Universita degli studi di Roma Tor Vergata, Dipartimento di Fisica, Via della Ricerca Scientifica 1, Rome, 00133 Italy; Universita degli studi di Roma Tor Vergata, Centro NAST, Via della Ricerca Scientifica 1, Rome, 00133 Italy
5 Centro Fermi - Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi”, Piazza del Viminale 1, Rome, 00184 Italy; Universita degli studi di Roma Tor Vergata, Centro NAST, Via della Ricerca Scientifica 1, Rome, 00133 Italy
6 ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 OQX, UK
7 ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 OQX, UK; Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
8 Universita degli studi di Roma Tor Vergata, Dipartimento di Fisica, Via della Ricerca Scientifica 1, Rome, 00133 Italy; Universita degli studi di Roma Tor Vergata, Centro NAST, Via della Ricerca Scientifica 1, Rome, 00133 Italy; Centro Fermi - Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi”, Piazza del Viminale 1, Rome, 00184 Italy; CNR-IPCF Sezione di Messina, Viale Ferdinando Stagno d’Alcontres 37, Messina, 98158 Italy