A5020575089- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Neutrino Physics Research
- Radiation Detection and Scintillator Technologies
- Cosmology and Gravitation Theories
- Astrophysics and Cosmic Phenomena
- Superconducting and THz Device Technology
- Particle accelerators and beam dynamics
- Scientific Research and Discoveries
- Nuclear Physics and Applications
- Superconducting Materials and Applications
- High-Energy Particle Collisions Research
- Radioactive Decay and Measurement Techniques
- Radiation Therapy and Dosimetry
Queen's University
2014-2024
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...
Many low-threshold experiments observe sharply rising event rates of yet unknown origins below a few hundred eV, and larger than expected from known backgrounds. Due to the significant impact this excess on dark matter or neutrino sensitivity these experiments, collective effort has been started share knowledge about individual observations. For this, EXCESS Workshop was initiated. In its first iteration in June 2021, ten rare search collaborations contributed initiative via talks...
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...
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...
Abstract The New Experiments With Spheres-Gas (NEWS-G) collaboration intends to achieve sub-GeV/c 2 Weakly Interacting Massive Particles (WIMPs) detection using Spherical Proportional Counters (SPCs). SPCs are gaseous detectors relying on ionisation with a single ionization electron energy threshold. latest generation of SPC for direct dark matter searches has been installed at SNOLAB in Canada 2021. This article details the different processes involved fabrication NEWS-G experiment. Also...
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...
Spherical Proportional Counters (SPCs) are a novel gaseous detector technology employed by the NEWS-G low-mass dark matter search experiment for their high sensitivity to single electrons from ionization. In this paper, we report on first characterization of electron response SPCs with unprecedented precision, using UV-laser calibration system. The experimental approach and analysis methodology presented along various direct applications upcoming next phase at SNOLAB. These include...
The NEWS-G collaboration uses spherical proportional counters (SPCs) to search for weakly interacting massive particles (WIMPs). In this paper, we report the first measurements of nuclear quenching factor in neon gas at 2 bar using an SPC deployed a neutron beam TUNL facility. energy-dependence is modeled simple power law: $\ensuremath{\alpha}{\mathrm{E}}_{\mathrm{nr}}^{\ensuremath{\beta}}$; determine its parameters by simultaneously fitting data collected with detector over range energies....
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...
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:...
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...
Kaluza-Klein axions appear in theories with extra dimensions as higher mass, significantly shorter lifetime, excitations of the Peccei-Quinn axion. When produced Sun, they would remain gravitationally trapped solar system, and their decay to a pair photons could provide an explanation corona heating problem. A low-density detector discriminate such signal from background, by identifying separation interaction point two photons. The NEWS-G collaboration uses large volume spherical...
The amount of energy released by a nuclear recoil ionizing the atoms active volume detection appears "quenched" compared to an electron same kinetic energy. This different behavior in ionization between electrons and nuclei is described Ionization Quenching Factor (IQF) it plays crucial role direct dark matter searches. For low energies (below $50~\mathrm{keV}$), IQF measurements deviate significantly from common models used for theoretical predictions simulations. We report proton,...
Low-temperature cryogenics open the door for a range of interesting technologies based on features like superconductivity and superfluidity, low-temperature phase transitions or low heat capacity non-metals in milli-Kelvin range. Devices these are often sensitive to small energy depositions as can be caused by environmental radiation. The Cryogenic Underground TEst facility (CUTE) at SNOLAB is platform testing operating cryogenic devices an environment with levels background. large...
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...
The specific activity of the beta decay $^{39}$Ar in atmospheric argon is measured using DEAP-3600 detector. DEAP-3600, located 2 km underground at SNOLAB, uses a total (3269 $\pm$ 24) kg liquid distilled from atmosphere to search for dark matter. This detector with very low background pulseshape discrimination differentiate between nuclear recoils and electron well-suited measure $^{39}$Ar. With 167 live-days data, time extraction [0.964 0.001 (stat) 0.024 (sys)] Bq/kg$_{\rm atmAr}$ which...