A5056909166- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Neutrino Physics Research
- Radiation Detection and Scintillator Technologies
- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- Cosmology and Gravitation Theories
- Quantum, superfluid, helium dynamics
- Nuclear physics research studies
- Atmospheric Ozone and Climate
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Indoor and Outdoor Localization Technologies
- Inertial Sensor and Navigation
- Energy Efficient Wireless Sensor Networks
- Pulsed Power Technology Applications
- Laser Design and Applications
- Radiation Therapy and Dosimetry
- CCD and CMOS Imaging Sensors
- Plasma Diagnostics and Applications
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Photocathodes and Microchannel Plates
- Scientific Research and Discoveries
Lawrence Berkeley National Laboratory
2022-2024
University of Edinburgh
2024
Yale University
2018-2023
Pacific Northwest National Laboratory
2019-2021
A search for neutrinoless double-beta decay ($0\nu\beta\beta$) in $^{136}$Xe is performed with the full EXO-200 dataset using a deep neural network to discriminate between $0\nu\beta\beta$ and background events. Relative previous analyses, signal detection efficiency has been raised from 80.8% 96.4$\pm$3.0% energy resolution of detector at Q-value improved $\sigma/E=1.23\%$ $1.15\pm0.02\%$ upgraded detector. Accounting new data, median 90% confidence level half-life sensitivity this analysis...
The projected performance and detector configuration of nEXO are described in this pre-Conceptual Design Report (pCDR). is a tonne-scale neutrinoless double beta ($0νββ$) decay search $^{136}$Xe, based on the ultra-low background liquid xenon technology validated by EXO-200. With $\simeq$ 5000 kg enriched to 90% isotope 136, has half-life sensitivity approximately $10^{28}$ years. This represents an improvement about two orders magnitude with respect current results. Based experience gained...
We apply deep neural networks (DNN) to data from the EXO-200 experiment. In studied cases, DNN is able reconstruct relevant parameters—total energy and position—directly raw digitized waveforms, with minimal exceptions. For first time, developed algorithms are evaluated on real detector calibration data. The accuracy of reconstruction either reaches or exceeds what was achieved by conventional approaches over course Most existing event classification in particle physics trained Monte Carlo...
We report the first measurement of discrimination between low-energy helium recoils and electron in liquid xenon. This result is relevant to proposed low-mass dark matter searches which seek dissolve light target nuclei active volume liquid-xenon time projection chambers. Low-energy were produced by degrading <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>α</a:mi></a:math> particles from <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"...
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 absolute scintillation ionization yields generated by $\ensuremath{\gamma}$ interactions from $^{228}\mathrm{Th}$ (2615 keV), $^{226}\mathrm{Ra}$ (1764 $^{60}\mathrm{Co}$ (1332 keV 1173 keV) calibration sources, over range electric fields. The $W$ value that defines recombination-independent energy scale measured be...
Abstract Silicon photomultipliers (SiPMs) are solid-state, single-photon sensitive, pixelated sensors whose usage for scintillation detection has rapidly increased over the past decade. It is known that avalanche process within device, which renders a single photon detectable, can also generate secondary photons may be detected by separate device. This effect, as external crosstalk, could potentially degrade science goals of future xenon dark matter experiments. In this article, we measure...
Experiments searching for weakly interacting massive particle dark matter are now detecting background events from solar neutrino-electron scattering. However, the dominant radioactive in state-of-the-art experiments such as LZ and XENONnT is beta decays radon contamination. In spite of careful detector material screening, progenitor atoms ubiquitous long-lived, extremely soluble liquid xenon. We propose a change phase demonstrate that crystalline xenon offers more than factor <a:math...
We compute bounds on coefficients of effective operators in the Standard Model that can be inferred from observations neutrino scattering by COHERENT experiment. While many are bound extremely well past experiments full future data set will provide modest improvements for some operators.
Abstract We have built and operated a crystalline/vapor xenon TPC, with the goal of improving searches for dark matter. The motivation this instrument is fact that beta decays from radon decay chain to ground state presently limit state-of-the-art liquid/vapor experiments. In contrast, crystalline target has potential exclude, or tag reject radon-chain backgrounds. As preamble demonstrating such capabilities, present article makes first demonstration operation TPC electroluminescence (gas...
We report the first measurement of discrimination between low-energy helium recoils and electron in liquid xenon. This result is relevant to proposed low-mass dark matter searches which seek dissolve light target nuclei active volume liquid-xenon time projection chambers. Low-energy were produced by degrading $\alpha$ particles from $^{210}$Po with a gold foil situated on cathode xenon time-projection chamber. The resulting population recoil events well separated also offset expected...
These proceedings summarize the program and discussions of ``Workshop on Xenon Detector $0\nu\beta\beta$ Searches: Steps Towards Kilotonne Scale'' held October 25-27 2023 at SLAC National Accelerator Laboratory. This workshop brought together experts from communities neutrinoless double-beta decay dark matter detection, to discuss paths forward for realization monolithic experiments with xenon approaching kilotonne scale.
For the field of high energy physics to continue have a bright future, priority within must be given investments in development both evolutionary and transformational detector that is coordinated across national laboratories with university community, international partners other disciplines. While fundamental science questions addressed by never been more compelling, there acute awareness challenging budgetary technical constraints when scaling current technologies. Furthermore, many...
Silicon photomultipliers (SiPMs) are solid-state, single-photon sensitive, pixelated sensors whose usage for scintillation detection has rapidly increased over the past decade. It is known that avalanche process within device, which renders a single photon detectable, can also generate secondary photons may be detected by separate device. This effect, as external crosstalk, could potentially degrade science goals of future xenon dark matter experiments. In this article, we measure effect...
We compute bounds on coefficients of effective operators in the Standard Model that can be inferred from observations neutrino scattering by COHERENT experiment. While many are bound extremely well past experiments full future data set will provide modest improvements for some operators.
Experiments searching for weakly interacting massive particle dark matter are now detecting background events from solar neutrino-electron scattering. However, the dominant in state-of-the-art experiments such as LZ and XENONnT is beta decays radon contamination. In spite of careful detector material screening, progenitor atoms ubiquitous long-lived, extremely soluble liquid xenon. We propose a change phase demonstrate that crystalline xenon offers more than factor x500 exclusion against...