A5103147959- Atomic and Subatomic Physics Research
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Radiation Detection and Scintillator Technologies
- Neutrino Physics Research
- Nuclear Physics and Applications
- Particle Detector Development and Performance
- Cosmology and Gravitation Theories
- Quantum, superfluid, helium dynamics
- Radiation Therapy and Dosimetry
- Cold Atom Physics and Bose-Einstein Condensates
- Magnetic confinement fusion research
- NMR spectroscopy and applications
- Radioactive Decay and Measurement Techniques
- Advanced Optical Sensing Technologies
- Astrophysics and Cosmic Phenomena
- Methane Hydrates and Related Phenomena
- Advanced Semiconductor Detectors and Materials
- Quantum Chromodynamics and Particle Interactions
- Advanced Frequency and Time Standards
TRIUMF
2018-2024
Queen's University
2014-2023
University of Sudbury
2023
Snolab
2021-2022
Campbell Collaboration
2022
Technical University of Munich
2018
DEAP-3600 is a single-phase liquid argon (LAr) direct-detection dark matter experiment, operating 2 km underground at SNOLAB (Sudbury, Canada). The detector consists of 3279 kg LAr contained in spherical acrylic vessel. This paper reports on the analysis $758\text{ }\text{ }\mathrm{tonne}\ifmmode\cdot\else\textperiodcentered\fi{}\mathrm{day}$ exposure taken over period 231 live-days during first year operation. No candidate signal events are observed WIMP-search region interest, which...
This Letter reports the first results of a direct dark matter search with DEAP-3600 single-phase liquid argon (LAr) detector. The experiment was performed 2 km underground at SNOLAB (Sudbury, Canada) utilizing large target mass, LAr contained in spherical acrylic vessel 3600 kg capacity. is viewed by an array PMTs, which would register scintillation light produced rare nuclear recoil signals induced particle scattering. An analysis 4.44 live days (fiducial exposure 9.87 ton day) data taken...
Dark matter with Planck-scale mass (≃10^{19} GeV/c^{2}) arises in well-motivated theories and could be produced by several cosmological mechanisms. A search for multiscatter signals from supermassive dark was performed a blind analysis of data collected over 813 d live time DEAP-3600, 3.3 t single-phase liquid argon-based detector at SNOLAB. No candidate were observed, leading to the first direct detection constraints on matter. Leading limits constrain masses between 8.3×10^{6} 1.2×10^{19}...
The physics reach of a low threshold (100 eV) scintillating argon bubble chamber sensitive to Coherent Elastic neutrino-Nucleus Scattering (CE$\nu$NS) from reactor neutrinos is studied. sensitivity the weak mixing angle, neutrino magnetic moment, and light $Z'$ gauge boson mediator are analyzed. A Monte Carlo simulation backgrounds performed assess their contribution signal. analysis shows that world-leading sensitivities achieved with one-year exposure for 10 kg at 3 m 1 MW$_{th}$ research...
The DEAP-3600 experiment is located 2 km underground at SNOLAB, in Sudbury, Ontario. It a single-phase detector that searches for dark matter particle interactions within 1000-kg fiducial mass target of liquid argon. A first generation prototype (DEAP-1) with 7-kg argon demonstrated high level pulse-shape discrimination (PSD) reducing β/γ backgrounds and helped to develop low radioactivity techniques mitigate surface-related α backgrounds. Construction the nearly complete commissioning...
DEAP-3600 is a single-phase liquid argon detector aiming to directly detect weakly interacting massive particles (WIMPs), located at SNOLAB (Sudbury, Canada). After analyzing data taken during the first year of operation, null result was used place an upper bound on WIMP-nucleon, spin-independent, isoscalar cross section. This study reinterprets this within nonrelativistic effective field theory framework and further examines how various possible substructures in local dark matter halo may...
We installed a source for ultracold neutrons at new, dedicated spallation target TRIUMF. The was originally developed in Japan and uses superfluid-helium converter cooled to 0.9$\,$K. During an extensive test campaign November 2017, we extracted up 325000 after one-minute irradiation of the target, over three times more than previously achieved with this source. corresponding ultracold-neutron density whole production guide volume is 5.3$\,$cm$^{-3}$. storage lifetime initially 37$\,$s...
The DEAP-3600 experiment is searching for weakly interacting massive particles dark matter with a $\text{ }3.3\text{ }\ifmmode\times\else\texttimes\fi{}1{0}^{3}\text{kg}$ single phase liquid argon (LAr) target, located 2.1 km underground at SNOLAB. experimental signature of interactions kilo electron volt--scale $^{40}\mathrm{Ar}$ nuclear recoils producing 128 nm LAr scintillation photons observed by photomultiplier tubes. largest backgrounds in are electronic (ERs) induced...
Abstract The DEAP-3600 detector searches for the scintillation signal from dark matter particles scattering on a 3.3 tonne liquid argon target. largest background comes $$^{39}\text{ Ar }$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mrow/> <mml:mn>39</mml:mn> </mml:msup> <mml:mspace/> <mml:mtext>Ar</mml:mtext> </mml:mrow> </mml:math> beta decays and is suppressed using pulse-shape discrimination (PSD). We use two types of PSD estimator:...
Abstract The specific activity of the $$\beta $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>β</mml:mi> </mml:math> decay $$^{39}$$ <mml:msup> <mml:mrow /> <mml:mn>39</mml:mn> </mml:msup> Ar in atmospheric argon is measured using DEAP-3600 detector. DEAP-3600, located 2 km underground at SNOLAB, uses a total (3269 ± 24) kg liquid distilled from atmosphere to search for dark matter. This detector well-suited measure owing its very low background levels. achieved two...
The Scintillating Bubble Chamber (SBC) collaboration is developing liquid-noble bubble chambers for the detection of sub-keV nuclear recoils. These detectors benefit from electron recoil rejection inherent in moderately-superheated with addition energy reconstruction provided scintillation signal. ability to measure low-energy recoils allows search GeV-scale dark matter and measurement coherent elastic neutrino-nucleus scattering on argon MeV-scale reactor antineutrinos. first physics-scale...
DEAP-3600 uses liquid argon contained in a spherical acrylic vessel as target medium to perform sensitive spin-independent dark matter search. Argon scintillates the vacuum ultraviolet spectrum, which requires wavelength shifting convert VUV photons visible so they can be transmitted through light guides and detected by surrounding photomultiplier tubes. The shifter 1,1,4,4-tetraphenyl-1,3-butadiene was evaporatively deposited inner surface of under vacuum. Two evaporations were performed on...
Silicon Photo-Multipliers (SiPMs) are detectors sensitive to single photons that used detect scintillation and Cherenkov light in a variety of physics medical-imaging applications. SiPMs measure by amplifying the photo-generated carriers (electrons or holes) via Geiger-mode avalanche. The Photon Detection Efficiency (PDE) is combined probability photon absorbed active volume device with subsequently triggered Absorption avalanche triggering probabilities correlated since latter depends on...
Experiments that use liquid noble gases as target materials, such argon and xenon, play a significant role in direct detection searches for weakly interacting massive particles(-like) dark matter. As these experiments grow size, they will soon encounter new background to their matter discovery potential from neutrino scattering off nuclei electrons targets. Therefore, better understanding of this source is crucial future large-scale ARGO DARWIN. In work, we study the impact atmospheric flux...
The Scintillating Bubble Chamber (SBC) experiment is a novel low-background technique aimed at detecting low-mass (0.7-7 GeV/c2) WIMP interactions and coherent scattering of reactor neutrinos (CEvNS). detector consists quartz-jar filled with liquid Argon (LAr), which spiked O(100 ppm) Xenon (LXe) acting as wavelength shifter. target fluid de-pressurized into super-heated state by mechanically controlled piston. Particles interacting the LAr+100 ppm LXe can generate heat (bubbles)...
In this paper, we report on the photon emission of Silicon Photomultipliers (SiPMs) from avalanche pulses generated in dark conditions, with main objective better understanding associated systematics for next-generation, large area, SiPM-based physics experiments. A new apparatus spectral and imaging analysis was developed at TRIUMF used to measure light emitted by two SiPMs considered as photo-sensor candidates nEXO neutrinoless double-beta decay experiment: one Fondazione Bruno Kessler...
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) used to suppress electromagnetic background events. The excellent PSD performance of LAr makes it viable target matter searches, discussed here basis PSD. observed combination physics with effects. We present model energy region interest searches. composed a) physics, including...
In response to the growing need for low-radioactivity argon, community experts and interested parties came together a 2-day workshop discuss worldwide argon needs challenges associated with its production characterization. Several topics were covered: experimental requirements sources of production, how long-lived radionuclides are created in nature, measuring radionuclides, other applicable topics. The Low-Radioactivity Underground Argon (LRUA) took place on March 19-20, 2018 at Pacific...
A fast-switching, high-repetition-rate magnet and power supply have been developed for operated at TRIUMF, to deliver a proton beam the new ultracold neutron (UCN) facility. The facility possesses unique operational requirements: time-averaged current of 40~$\mu$A with ability switch on or off several minutes. These requirements are in conflict typical operation mode TRIUMF cyclotron which delivers nearly continuous multiple users. To enable creation UCN facility, beam-sharing arrangement...