R. Stainforth
A5083803228- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Neutrino Physics Research
- Radiation Detection and Scintillator Technologies
- Effects of Radiation Exposure
- Cosmology and Gravitation Theories
- Radioactivity and Radon Measurements
- Radiation Therapy and Dosimetry
- Carcinogens and Genotoxicity Assessment
- Particle Detector Development and Performance
- Spaceflight effects on biology
- Astrophysics and Cosmic Phenomena
- Nuclear physics research studies
- Molecular Biology Techniques and Applications
- Health, Environment, Cognitive Aging
- Animal testing and alternatives
- Atmospheric Ozone and Climate
- Gene expression and cancer classification
- Radioactive contamination and transfer
- DNA Repair Mechanisms
- Noise Effects and Management
- Astronomy and Astrophysical Research
- Quantum, superfluid, helium dynamics
- Graphite, nuclear technology, radiation studies
Health Canada
2019-2024
Carleton University
2018-2022
University of Liverpool
2016-2021
University of Sussex
2018
Queen's University
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}...
Abstract The knowledge of scintillation quenching $$\alpha $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>α</mml:mi> </mml:math> -particles plays a paramount role in understanding -induced backgrounds and improving the sensitivity liquid argon-based direct detection dark matter experiments. We performed relative measurement MeV energy region using radioactive isotopes ( $$^{222}$$ <mml:mmultiscripts> <mml:mrow/> <mml:mn>222</mml:mn> </mml:mmultiscripts> Rn, $$^{218}$$...
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...
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...
Background Adverse outcome pathways (AOPs) describe how a measurable sequence of key events, beginning from molecular initiator, can lead to an adverse relevance risk assessment. An AOP is modular by design, comprised four main components: (1) Molecular Initiating Event (MIE), (2) Key Events (KEs), (3) Relationships (KERs) and (4) Outcome (AO).Purpose Here, we illustrate the utility concept through case example in field ionizing radiation, using Organisation for Economic Cooperation...
Background: Ionizing radiation from galactic cosmic rays (GCR) is one of the major risk factors that will impact health astronauts on extended missions outside protective effects Earth’s magnetic field. The NASA GeneLab project has detailed information exposure using animal models with curated dosimetry for spaceflight experiments. Methods: We analyzed multiple omics datasets associated both ground-based and studies included in vivo vitro approaches. A range ions protons to iron particles...
Exposure to different forms of ionizing radiation occurs in diverse occupational, medical, and environmental settings. Improving the accuracy estimated health risks associated with exposure is therefore, essential for protecting public, particularly as it relates chronic low dose exposures. A key aspect understanding precise accurate modeling dose-response relationship. Toward this vision, benchmark (BMD) may be a suitable approach consideration field. BMD already extensively used chemical...
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...
Purpose Benchmark dose (BMD) modeling is a method commonly used in chemical toxicology to identify the point of departure (POD) from dose-response curve linked health-related outcome. Recently, its application analysis transcriptional data for quantitative adverse outcome pathway (AOP) development being explored. As AOPs are informed by diverse types, it important understand impact study parameters such as selection, number replicates and range on BMD outputs radiation-induced genes...
Adverse outcome pathways (AOPs) provide a modular framework for describing sequences of biological key events (KEs) and event relationships (KERs) across levels organization. Empirical evidence KERs can support construction quantified AOPs (qAOPs). Using an example AOP energy deposition from ionizing radiation onto DNA leading to lung cancer incidence, we investigate the feasibility quantifying data supported by all types stressors. The merits challenges this process in context are...
The knowledge of scintillation quenching $\alpha$-particles plays a paramount role in understanding $\alpha$-induced backgrounds and improving the sensitivity liquid argon-based direct detection dark matter experiments. We performed relative measurement MeV energy region using radioactive isotopes ($^{222}$Rn, $^{218}$Po $^{214}$Po isotopes) present trace amounts DEAP-3600 detector quantified uncertainty extrapolating factor to low-energy region.
DEAP-3600, with its 3.3 tonnes liquid argon target, is a dark matter direct detection experiment set at SNOLAB in Sudbury, Canada. Since 2019, the has held most stringent exclusion limit for Weakly Interacting Massive Particles (WIMPs) above 20 GeV/c$^2$. Detector upgrades have been ongoing since end of second fill run 2020 to reduce backgrounds from shadowed alphas and dust dissolved it upcoming third run. In parallel that, physics reach widened, unique contributions WIMP search within...