Thomas McElroy
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View article: Search for Double Beta Decays of $^{134}$Xe with EXO-200 Phase II
Search for Double Beta Decays of $^{134}$Xe with EXO-200 Phase II Open
EXO-200 was a leading double beta decay experiment consisting of a single-phase, enriched liquid xenon time projection chamber filled with an admixture of 80.672% $^{136}$Xe and 19.098% $^{134}$Xe. The detector operated at WIPP between 201…
View article: Publisher Erratum: Characterization of external cross-talk from silicon photomultipliers in a liquid xenon detector
Publisher Erratum: Characterization of external cross-talk from silicon photomultipliers in a liquid xenon detector Open
View article: Characterization of external cross-talk from silicon photomultipliers in a liquid xenon detector
Characterization of external cross-talk from silicon photomultipliers in a liquid xenon detector Open
The Light-only Liquid Xenon experiment (LoLX) employs a small-scale detector equipped with 96 Hamamatsu VUV4 silicon photomultipliers (SiPMs) submerged in 5 kg of liquid xenon (LXe) to perform characterization measurements of light product…
View article: Position Reconstruction in the DEAP-3600 Dark Matter Search Experiment
Position Reconstruction in the DEAP-3600 Dark Matter Search Experiment Open
In the DEAP-3600 dark matter search experiment, precise reconstruction of the positions of scattering events in liquid argon is key for background rejection and defining a fiducial volume that enhances dark matter candidate events identifi…
View article: Measuring Dark Currents in Multiple Cryogenic SiPMs With Sub-pA Sensitivity Using an Automated <i>I–V</i> Multiplexer
Measuring Dark Currents in Multiple Cryogenic SiPMs With Sub-pA Sensitivity Using an Automated <i>I–V</i> Multiplexer Open
We present the design of an automated current-voltage (IV) multiplexer (MUX) that enables accurate measurement of the dark current in cryogenic silicon photomultipliers (SiPMs), achieving a sensitivity equivalent to detecting less than one…
View article: Simulation Study of Photon-to-Digital Converter (PDC) Timing Specifications for LoLX Experiment
Simulation Study of Photon-to-Digital Converter (PDC) Timing Specifications for LoLX Experiment Open
The Light only Liquid Xenon (LoLX) experiment is a prototype detector aimed to study liquid xenon (LXe) light properties and various photodetection technologies. LoLX is also aimed to quantify LXe's time resolution as a potential scintilla…
View article: Precision measurement of the specific activity of $$^{39}$$Ar in atmospheric argon with the DEAP-3600 detector
Precision measurement of the specific activity of $$^{39}$$Ar in atmospheric argon with the DEAP-3600 detector Open
The specific activity of the $$\beta $$ decay of $$^{39}$$ Ar in atmospheric argon is measured using the DEAP-3600 detector. DEAP-3600, located 2 km underground at SNOLAB, uses a total of (3269 ± 24) kg of liquid argon distilled from …
View article: Generative adversarial networks for scintillation signal simulation in EXO-200
Generative adversarial networks for scintillation signal simulation in EXO-200 Open
Generative Adversarial Networks trained on samples of simulated or actual events have been proposed as a way of generating large simulated datasets at a reduced computational cost. In this work, a novel approach to perform the simulation o…
View article: Search for Two-neutrino Double-Beta Decay of $^{136}\rm Xe$ to the $0^+_1$ excited state of $^{136}\rm Ba$ with the Complete EXO-200 Dataset
Search for Two-neutrino Double-Beta Decay of $^{136}\rm Xe$ to the $0^+_1$ excited state of $^{136}\rm Ba$ with the Complete EXO-200 Dataset Open
A new search for two-neutrino double-beta ($2νββ$) decay of $^{136}\rm Xe$ to the $0^+_1$ excited state of $^{136}\rm Ba$ is performed with the full EXO-200 dataset. A deep learning-based convolutional neural network is used to discriminat…
View article: Precision Measurement of the Specific Activity of $^{39}$Ar in Atmospheric Argon with the DEAP-3600 Detector
Precision Measurement of the Specific Activity of $^{39}$Ar in Atmospheric Argon with the DEAP-3600 Detector Open
The specific activity of the beta decay of $^{39}$Ar in atmospheric argon is measured using the DEAP-3600 detector. DEAP-3600, located 2 km underground at SNOLAB, uses a total of (3269 $\pm$ 24) kg of liquid argon distilled from the atmosp…
View article: Search for MeV electron recoils from dark matter in EXO-200
Search for MeV electron recoils from dark matter in EXO-200 Open
We present a search for electron-recoil signatures from the charged-current absorption of fermionic dark matter using the EXO-200 detector. We report an average electron-recoil background rate of 6.8 × 104 cts kg–1 yr…
View article: The EXO-200 detector, part II: auxiliary systems
The EXO-200 detector, part II: auxiliary systems Open
The EXO-200 experiment searched for neutrinoless double-beta decay of 136 Xe with a single-phase liquid xenon detector. It used an active mass of 110 kg of 80.6%-enriched liquid xenon in an ultra-low background time projection chamber with…
View article: Erratum: Constraints on dark matter-nucleon effective couplings in the presence of kinematically distinct halo substructures using the DEAP-3600 detector [Phys. Rev. D <b>102</b>, 082001 (2020)]
Erratum: Constraints on dark matter-nucleon effective couplings in the presence of kinematically distinct halo substructures using the DEAP-3600 detector [Phys. Rev. D <b>102</b>, 082001 (2020)] Open
Received 24 December 2021DOI:https://doi.org/10.1103/PhysRevD.105.029901© 2022 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasCosmologyDark matterParticle astrophysicsParticle dark matterPhysical SystemsGalactic hal…
View article: First Direct Detection Constraints on Planck-Scale Mass Dark Matter with Multiple-Scatter Signatures Using the DEAP-3600 Detector
First Direct Detection Constraints on Planck-Scale Mass Dark Matter with Multiple-Scatter Signatures Using the DEAP-3600 Detector Open
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 matter was performed with a blind …
View article: Search for Majoron-emitting modes of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Xe</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>136</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math> double beta decay with the complete EXO-200 dataset
Search for Majoron-emitting modes of double beta decay with the complete EXO-200 dataset Open
A search for Majoron-emitting modes of the neutrinoless double beta decay of 136Xe is performed with the full EXO-200 dataset. This dataset consists of a total 136Xe exposure of 234.1 kg · yr, and includes data with d…
View article: nEXO: neutrinoless double beta decay search beyond 10<sup>28</sup> year half-life sensitivity
nEXO: neutrinoless double beta decay search beyond 10<sup>28</sup> year half-life sensitivity Open
The nEXO neutrinoless double beta (0 νββ ) decay experiment is designed to use a time projection chamber and 5000 kg of isotopically enriched liquid xenon to search for the decay in 136 Xe. Progress in the detector design, paired with high…
View article: Two-year optical site characterization for the Pacific Ocean Neutrino Experiment (P-ONE) in the Cascadia Basin
Two-year optical site characterization for the Pacific Ocean Neutrino Experiment (P-ONE) in the Cascadia Basin Open
View article: Search for Majoron-emitting modes of $^{136}$Xe double beta decay with the complete EXO-200 dataset
Search for Majoron-emitting modes of $^{136}$Xe double beta decay with the complete EXO-200 dataset Open
A search for Majoron-emitting modes of the neutrinoless double-beta decay of ¹³⁶Xe is performed with the full EXO-200 dataset. This dataset consists of a total ¹³⁶Xe exposure of 234.1 kg⋅yr, and includes data with detector upgrades that ha…
View article: Pulse-shape discrimination against low-energy Ar-39 beta decays in liquid argon with 4.5 tonne-years of DEAP-3600 data
Pulse-shape discrimination against low-energy Ar-39 beta decays in liquid argon with 4.5 tonne-years of DEAP-3600 data Open
View article: Reflectivity of VUV-sensitive silicon photomultipliers in liquid Xenon
Reflectivity of VUV-sensitive silicon photomultipliers in liquid Xenon Open
Silicon photomultipliers are regarded as a very promising technology for next-generation, cutting-edge detectors for low-background experiments in particle physics. This work presents systematic reflectivity studies of Silicon Photomultipl…
View article: Pacific Ocean Neutrino Experiment (P-ONE): prototype line development
Pacific Ocean Neutrino Experiment (P-ONE): prototype line development Open
The Pacific Ocean Neutrino Experiment (P-ONE) is a new initiative to construct one of the world’s largest neutrino detectors in the deep Pacific Ocean off the coast of British Columbia, Canada. Located in the Cascadia Basin region, P-ONE b…
View article: Optical analysis of the Pacific Ocean Neutrino Experiment (P-ONE) site using data from the first pathfinder mooring
Optical analysis of the Pacific Ocean Neutrino Experiment (P-ONE) site using data from the first pathfinder mooring Open
The Pacific Ocean Neutrino Experiment (P-ONE) is an initiative by a collaboration of Canadian and German universities as well as Ocean Networks Canada (ONC) to develop a new large-scale neutrino telescope 2600 m below the ocean off the coa…
View article: P-ONE second pathfinder mission: STRAW-b
P-ONE second pathfinder mission: STRAW-b Open
The Pacific Ocean Neutrino Explorer (P-ONE) collaboration was born to build a new large-scale neutrino telescope in the Pacific Ocean, at 2600 m b.s.l. in Cascadia Basin, off Vancouver Island. The first steps aimed at the feasibility study…
View article: Event reconstruction in a liquid xenon Time Projection Chamber with an optically-open field cage
Event reconstruction in a liquid xenon Time Projection Chamber with an optically-open field cage Open
View article: Constraints on dark matter-nucleon effective couplings in the presence of kinematically distinct halo substructures using the DEAP-3600 detector
Constraints on dark matter-nucleon effective couplings in the presence of kinematically distinct halo substructures using the DEAP-3600 detector Open
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, a null result was…
View article: Measurement of the scintillation and ionization response of liquid xenon at MeV energies in the EXO-200 experiment
Measurement of the scintillation and ionization response of liquid xenon at MeV energies in the EXO-200 experiment Open
In this work, liquid xenon (LXe) is employed in a number of current and future detectors for rare event searches. We use the EXO-200 experimental data to measure the absolute scintillation and ionization yields generated by γ interactions …
View article: Measurement of the Spectral Shape of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>β</mml:mi></mml:math>-Decay of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Xe</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>137</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math> to the Ground State of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Cs</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>137</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math> in EXO-200 and Comparison with Theory
Measurement of the Spectral Shape of the -Decay of to the Ground State of in EXO-200 and Comparison with Theory Open
We report on a comparison between the theoretically predicted and experimentally measured spectra of the first-forbidden nonunique β-decay transition ^{137}Xe(7/2^{-})→^{137}Cs(7/2^{+}). The experimental data were acquired by the EXO-200 e…
View article: Measurements of electron transport in liquid and gas Xenon using a laser-driven photocathode
Measurements of electron transport in liquid and gas Xenon using a laser-driven photocathode Open
View article: The liquid-argon scintillation pulseshape in DEAP-3600
The liquid-argon scintillation pulseshape in DEAP-3600 Open
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 electrom…
View article: Electromagnetic backgrounds and potassium-42 activity in the DEAP-3600 dark matter detector
Electromagnetic backgrounds and potassium-42 activity in the DEAP-3600 dark matter detector Open
The DEAP-3600 experiment is searching for WIMP dark matter with a 3.3 tonne\nsingle phase liquid argon (LAr) target, located 2.1 km underground at SNOLAB.\nThe experimental signature of dark matter interactions is keV-scale $^{40}$Ar\nnucl…