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Review of Scientific Instruments / Volume 75 / Issue 11 / ARTICLES / OPTICS; ATOMS AND MOLECULES; SPECTROSCOPY; PHOTON DETECTORS

Rev. Sci. Instrum. 75, 4880 (2004); http://dx.doi.org/10.1063/1.1795091 (11 pages)

YAP scintillators for resonant detection of epithermal neutrons at pulsed neutron sources

M. Tardocchi1, G. Gorini1, A. Pietropaolo2, C. Andreani2, R. Senesi2, N. Rhodes3, and E. M. Schooneveld3

1INFM, UdR Milano-Bicocca, Milano, Italy and Università degli Studi di Milano-Bicocca, Dipartimento di Fisica “G. Occhialini,” Milano, Italy
2INFM, UdR Tor Vergata, Roma, Italy and Università degli Studi di Roma “Tor Vergata,” Dipartimento di Fisica, Roma, Italy
3Rutherford Appleton Laboratory, ISIS Facility, Didcot, United Kingdom

(Received 4 May 2004; accepted 24 July 2004; published online 1 November 2004)

Recent studies indicate the resonance detector (RD) technique as an interesting approach for neutron spectroscopy in the electron volt energy region. This work summarizes the results of a series of experiments where RD consisting of YAlO3 (YAP) scintillators were used to detect scattered neutrons with energy in the range 1–200 eV. The response of YAP scintillators to radiative capture γ emission from a 238U analyzer foil was characterized in a series of experiments performed on the VESUVIO spectrometer at the ISIS pulsed neutron source. In these experiments a biparametric data acquisition allowed the simultaneous measurements of both neutron time-of-flight and γ pulse height (energy) spectra. The analysis of the γ pulse height and neutron time of flight spectra permitted to identify and distinguish the signal and background components. These measurements showed that a significant improvement in the signal-to-background ratio can be achieved by setting a lower level discrimination on the pulse height at about 600 keV equivalent photon energy. Present results strongly indicate YAP scintillators as the ideal candidate for neutron scattering studies with epithermal neutrons at both very low (<5°) and intermediate scattering angles.

© 2004 American Institute of Physics

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KEYWORDS and PACS

Keywords

yttrium compounds, solid scintillation detectors, neutron detection, neutron sources, neutron spectroscopy, pulse height analysers, time of flight spectra

PACS

  • 61.05.fg

    Neutron scattering (including small-angle scattering)

  • 29.40.Mc

    Scintillation detectors

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1795091

PUBLICATION DATA

ISSN

0034-6748 (print)  
1089-7623 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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    W. E. Lamb, Phys. Rev. 55, 190 (1939).


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