A novel segmented-scintillator antineutrino detector

Y. Abreu, Y. Amhis, L. Arnold, G. Ban, W. Beaumont, M. Bongrand, D. Boursette, J. M. Buhour, B. C. Castle, K. Clark, B. Coupé, A. S. Cucoanes, D. Cussans, A. De Roeck, J. D'Hondt, D. Durand, M. Fallot, S. Fresneau, L. Ghys, L. GiotB. Guillon, G. Guilloux, S. Ihantola, X. Janssen, S. Kalcheva, L. N. Kalousis, E. Koonen, M. Labare, G. Lehaut, J. Mermans, I. Michiels, C. Moortgat, D. Newbold, J. Park, K. Petridis, I. Piñera, G. Pommery, L. Popescu, G. Pronost, J. Rademacker, A. Reynolds, D. Ryckbosch, N. Ryder, D. Saunders, Yu A. Shitov, M. H. Schune, P. R. Scovell, L. Simard, A. Vacheret*, S. Van Dyck, P. Van Mulders, N. Van Remortel, S. Vercaemer, A. Waldron, A. Weber, F. Yermia

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

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Abstract

The next generation of very-short-baseline reactor experiments will require compact detectors operating at surface level and close to a nuclear reactor. This paper presents a new detector concept based on a composite solid scintillator technology. The detector target uses cubes of polyvinyltoluene interleaved with 6LiF:ZnS(Ag) phosphor screens to detect the products of the inverse beta decay reaction. A multi-tonne detector system built from these individual cells can provide precise localisation of scintillation signals, making efficient use of the detector volume. Monte Carlo simulations indicate that a neutron capture efficiency of over 70 % is achievable with a sufficient number of 6LiF:ZnS(Ag) screens per cube and that an appropriate segmentation enables a measurement of the positron energy which is not limited by γ-ray leakage. First measurements of a single cell indicate that a very good neutron-gamma discrimination and high neutron detection efficiency can be obtained with adequate triggering techniques. The light yield from positron signals has been measured, showing that an energy resolution of 14%/√E(MeV) is achievable with high uniformity. A preliminary neutrino signal analysis has been developed, using selection criteria for pulse shape, energy, time structure and energy spatial distribution and showing that an antineutrino efficiency of 40% can be achieved. It also shows that the fine segmentation of the detector can be used to significantly decrease both correlated and accidental backgrounds.

Original languageEnglish
Article numberP04024
Number of pages21
JournalJournal of Instrumentation
Volume12
Issue number4
DOIs
Publication statusPublished - 21 Apr 2017

Keywords

  • Calorimeters
  • Neutrino detectors
  • Neutron detectors (cold, thermal, fast neutrons)
  • Particle identification methods

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