Sensitivity of future liquid argon dark matter search experiments to core-collapse supernova neutrinos
Journal of Cosmology and Astroparticle Physics IOP Publishing 2021:03 (2021) 043
Constraints on dark matter-nucleon effective couplings in the presence of kinematically distinct halo substructures using the DEAP-3600 detector
Physical Review D American Physical Society (APS) 102:8 (2020) 082001
The liquid-argon scintillation pulseshape in DEAP-3600
The European Physical Journal C SpringerOpen 80:4 (2020) 303
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 detectorsElectromagnetic backgrounds and potassium-42 activity in the DEAP-3600 dark matter detector
Physical Review D American Physical Society (APS) 100:7 (2019) 072009
Search for dark matter with a 231-day exposure of liquid argon using DEAP-3600 at SNOLAB
Physical Review D American Physical Society (APS) 100:2 (2019) 022004