Journal
EUROPEAN PHYSICAL JOURNAL C
Volume 80, Issue 4, Pages -Publisher
SPRINGER
DOI: 10.1140/epjc/s10052-020-7789-x
Keywords
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Categories
Funding
- Arthur B. McDonald Canadian Astroparticle Research Institute, DGAPA-UNAM (PAPIIT) [IA100118, IN108020]
- Consejo Nacional de Ciencia y Tecnologia (CONACyT, Mexico) [252167, A1-S-8960]
- European Research Council [ERC StG 279980]
- UK Science and Technology Facilities Council [STFC ST/K002570/1, ST/R002908/1]
- Russian Science Foundation [16-12-10369]
- Leverhulme Trust [ECF-20130496]
- Spanish Ministry of Science, Innovation and Universities [FPA2017-82647-P, MDM-2015-0509]
- International Research Agenda Programme AstroCeNT - Foundation for Polish Science (FNP) from the European Regional Development Fund [MAB/2018/7]
- Rutherford Appleton Laboratory Particle Physics Division
- STFC
- SEPNet PhD
- CFI
- Province of Ontario MRI
- STFC [ST/S000844/1, ST/S000798/1, ST/K002570/1, ST/R002908/1] Funding Source: UKRI
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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.
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