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A novel segmented-scintillator antineutrino detector

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 (6)LiF: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 (6)LiF: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.
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Submitted on : Monday, July 3, 2017 - 6:25:38 PM
Last modification on : Wednesday, May 20, 2020 - 4:27:11 AM

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Y. Abreu, Y. Amhis, L. Arnold, G. Ban, W. Beaumont, et al.. A novel segmented-scintillator antineutrino detector. JINST, 2017, 12 (04), pp.P04024. ⟨10.1088/1748-0221/12/04/P04024⟩. ⟨hal-01554897⟩

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