The liquid-argon scintillation pulseshape in DEAP-3600

Adhikari, P, Ajaj, R, Araujo, G R, Batygov, M, Beltran, B, Bina, C E, Boulay, M G, Broerman, B, Bueno, J F, Butcher, A, Cai, B, Cárdenas-Montes, M, Cavuoti, S, Chen, Y, Peeters, S J M, The DEAP Collaboration, and others, (2020) The liquid-argon scintillation pulseshape in DEAP-3600. European Physical Journal C: Particles and Fields, 80 (a303). pp. 1-12. ISSN 1124-1861

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Abstract

DEAP-3600 is a liquid-argon scintillation detector looking for dark matter. Scintillation events in the liquid argon (LAr) are registered by 255 photomultiplier tubes (PMTs), and pulseshape discrimination (PSD) is used to suppress electromagnetic background events. The excellent PSD performance of LAr makes it a viable target for dark matter searches, and the LAr scintillation pulseshape discussed here is the basis of PSD. The observed pulseshape is a combination of LAr scintillation physics with detector effects. We present a model for the pulseshape of electromagnetic background events in the energy region of interest for dark matter searches. The model is composed of (a) LAr scintillation physics, including the so-called intermediate component, (b) the time response of the TPB wavelength shifter, including delayed TPB emission at
O(ms) time-scales, and c) PMT response. TPB is the wavelength shifter of choice in most LAr detectors. We find that approximately 10% of the intensity of the wavelength-shifted light is in a long-lived state of TPB. This causes light from an event to spill into subsequent events to an extent not usually accounted for in the design and data analysis of LAr-based detectors.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
SWORD Depositor: Mx Elements Account
Depositing User: Mx Elements Account
Date Deposited: 06 May 2020 07:13
Last Modified: 06 May 2020 07:15
URI: http://sro.sussex.ac.uk/id/eprint/91167

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