The ZEPLIN-III Anti-Coincidence Veto Detector
D. Yu. Akimov, H. M. Araujo, E. J. Barnes, V. A. Belov, A. A., Burenkov, V. Chepel, A. Currie, B. Edwards, V. Francis, C. Ghag, A., Hollingsworth, M. Horn, G. E. Kalmus, A. S. Kobyakin, A. G. Kovalenko, V. N., Lebedenko, A. Lindote, M. I. Lopes, R. Luscher, K. Lyons, P. Majewski

TL;DR
The paper details the design and implementation of a low-background, high-efficiency anti-coincidence veto detector for ZEPLIN-III, significantly reducing background noise and enhancing dark matter detection sensitivity.
Contribution
It introduces a novel veto detector with optimized radiological content and performance, improving background rejection in dark matter experiments.
Findings
Veto detector can reject over 65% of neutron background events.
Reduces ZEPLIN-III background from 0.4 to 0.14 events/year.
Capable of tagging over 15% of gamma-ray events.
Abstract
The design, optimisation and construction of an anti-coincidence veto detector to complement the ZEPLIN-III direct dark matter search instrument is described. One tonne of plastic scintillator is arranged into 52 bars individually read out by photomultipliers and coupled to a gadolinium-loaded passive polypropylene shield. Particular attention has been paid to radiological content. The overall aim has been to achieve a veto detector of low threshold and high efficiency without the creation of additional background in ZEPLIN-III, all at a reasonable cost. Extensive experimental measurements of the components have been made, including radioactivity levels and performance characteristics. These have been used to inform a complete end-to-end Monte Carlo simulation that has then been used to calculate the expected performance of the new instrument, both operating alone and as an…
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