E. P. Bernard
A5058137186- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Quantum, superfluid, helium dynamics
- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- Neutrino Physics Research
- Radiation Detection and Scintillator Technologies
- Cold Atom Physics and Bose-Einstein Condensates
- Nuclear Physics and Applications
- Cosmology and Gravitation Theories
- Advanced Chemical Physics Studies
- Superconducting Materials and Applications
- Astrophysics and Cosmic Phenomena
- Molecular Spectroscopy and Structure
- Radiation Therapy and Dosimetry
- Photocathodes and Microchannel Plates
- Fusion materials and technologies
- Atmospheric Ozone and Climate
- Spacecraft and Cryogenic Technologies
- Astronomy and Astrophysical Research
- Hydrogen Storage and Materials
- Medical Imaging Techniques and Applications
- Radioactive contamination and transfer
- Health, Environment, Cognitive Aging
- Web Data Mining and Analysis
Lawrence Livermore National Laboratory
2012-2024
University of California, Berkeley
2017-2023
Lawrence Berkeley National Laboratory
2017-2023
Yale University
2011-2021
Cornell University
2003-2012
University of Jyväskylä
2006
We report constraints on spin-independent weakly interacting massive particle (WIMP)-nucleon scattering using a 3.35×104 kg day exposure of the Large Underground Xenon (LUX) experiment. A dual-phase xenon time projection chamber with 250 active mass is operated at Sanford Research Facility under Lead, South Dakota (USA). With roughly fourfold improvement in sensitivity for high WIMP masses relative to our previous results, this search yields no evidence nuclear recoils. At 50 GeV c−2,...
The Large Underground Xenon (LUX) experiment is a dual-phase xenon time-projection chamber operating at the Sanford Research Facility (Lead, South Dakota). LUX cryostat was filled for first time in underground laboratory February 2013. We report results of WIMP search data set, taken during period from April to August 2013, presenting analysis 85.3 live days with fiducial volume 118 kg. A profile-likelihood technique shows our be consistent background-only hypothesis, allowing 90% confidence...
We present constraints on weakly interacting massive particles (WIMP)-nucleus scattering from the 2013 data of Large Underground Xenon dark matter experiment, including 1.4×104 kg day search exposure. This new analysis incorporates several advances: single-photon calibration at scintillation wavelength, improved event-reconstruction algorithms, a revised background model events originating detector walls in an enlarged fiducial volume, and calibrations decays injected tritium β source...
We present experimental constraints on the spin-dependent WIMP-nucleon elastic cross sections from total 129.5 kg-year exposure acquired by Large Underground Xenon experiment (LUX), operating at Sanford Research Facility in Lead, South Dakota (USA). A profile likelihood ratio analysis allows 90% CL upper limits to be set WIMP-neutron (WIMP-proton) section of $\sigma_n$ = 1.6$\times 10^{-41}$ cm$^{2}$ ($\sigma_p$ 5$\times 10^{-40}$ cm$^{2}$) 35 GeV$c^{-2}$, almost a sixfold improvement over...
The nature of dark matter and properties neutrinos are among the most pressing issues in contemporary particle physics. dual-phase xenon time-projection chamber is leading technology to cover available parameter space for Weakly Interacting Massive Particles (WIMPs), while featuring extensive sensitivity many alternative candidates. These detectors can also study through neutrinoless double-beta decay a variety astrophysical sources. A next-generation xenon-based detector will therefore be...
Abstract In 2021 JET exploited its unique capabilities to operate with T and D–T fuel an ITER-like Be/W wall (JET-ILW). This second major campaign (DTE2), after DTE1 in 1997, represented the culmination of a series enhancements—new fusion diagnostics, new injection capabilities, refurbishment plant, increased auxiliary heating, in-vessel calibration 14 MeV neutron yield monitors—as well as significant advances plasma theory modelling community. DTE2 was complemented by sequence isotope...
We present experimental constraints on the spin-dependent WIMP (weakly interacting massive particle)-nucleon elastic cross sections from LUX data acquired in 2013. is a dual-phase xenon time projection chamber operating at Sanford Underground Research Facility (Lead, South Dakota), which designed to observe recoil signature of galactic WIMPs scattering nuclei. A profile likelihood ratio analysis 1.4×104 kg day fiducial exposure allows 90% C.L. upper limits be set WIMP-neutron (WIMP-proton)...
The scattering of dark matter (DM) particles with sub-GeV masses off nuclei is difficult to detect using liquid xenon-based DM search instruments because the energy transfer during nuclear recoils smaller than typical detector threshold. However, tree-level DM-nucleus diagram can be accompanied by simultaneous emission a bremsstrahlung photon or so-called "Migdal" electron. These provide an electron recoil component experimental signature at higher energies corresponding recoil. presence...
The first searches for axions and axionlike particles with the Large Underground Xenon experiment are presented. Under assumption of an axioelectric interaction in xenon, coupling constant between electrons ${g}_{\mathrm{Ae}}$ is tested using data collected 2013 exposure totaling 95 live days $\ifmmode\times\else\texttimes\fi{}118\text{ }\text{ }\mathrm{kg}$. A double-sided, profile likelihood ratio statistic test excludes larger than...
We present measurements of the electron-recoil (ER) response LUX dark matter detector based upon 170 000 highly pure and spatially uniform tritium decays. reconstruct energy spectrum using combined model find good agreement with expectations. report average charge light yields ER events in liquid xenon at 180 $105\text{ }\text{ }\mathrm{V}/\mathrm{cm}$ compare results to NEST model. also measure mean recombination fraction its fluctuations, we investigate location width band. These provide...
Abstract 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 search for the in 136 Xe. Progress detector design, paired with higher fidelity its simulation an advanced data analysis, based on one used final results EXO-200, produce sensitivity prediction that exceeds half-life 10 28 years. Specifically, improvements have been made understanding production scintillation photons charge as...
The Migdal effect predicts that a nuclear recoil interaction can be accompanied by atomic ionization, allowing many dark matter direct detection experiments to gain sensitivity sub-GeV masses. We report the first search for M- and L-shell electrons in liquid xenon using recoils produced tagged neutron scatters. Despite an observed background rate lower than of expected signals region interest, we do not observe signal consistent with predictions. discuss possible explanations, including...
Abstract LUX-ZEPLIN (LZ) is a second-generation direct dark matter experiment with spin-independent WIMP-nucleon scattering sensitivity above $${1.4 \times 10^{-48}}\, {\hbox {cm}}^{2}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>1.4</mml:mn> <mml:mo>×</mml:mo> <mml:msup> <mml:mn>10</mml:mn> <mml:mo>-</mml:mo> <mml:mn>48</mml:mn> </mml:mrow> </mml:msup> <mml:mspace/> <mml:mtext>cm</mml:mtext> <mml:mn>2</mml:mn> </mml:math> for WIMP mass of $${40}\, \hbox...
Dual-phase xenon detectors, as currently used in direct detection dark matter experiments, have observed elevated rates of background electron events the low energy region. While this negatively impacts detector performance various ways, its origins only been partially studied. In paper we report a systematic investigation pathologies LUX experiment. We characterize different populations based on their emission intensities and correlations with preceding depositions detector. By studying...
The Large Underground Xenon (LUX) experiment is a dual-phase liquid xenon time projection chamber (TPC) operating at the Sanford Research Facility in Lead, South Dakota. A calibration of nuclear recoils was performed $\textit{in situ}$ LUX detector using collimated beam mono-energetic 2.45 MeV neutrons produced by deuterium-deuterium (D-D) fusion source. recoil energy from first neutron scatter TPC reconstructed measured scattering angle defined double-scatter events within active volume. We...
This work presents an analysis of monoenergetic electronic recoil peaks in the dark-matter-search and calibration data from first underground science run Large Underground Xenon (LUX) detector. Liquid xenon charge light yields for energies between 5.2 661.7 keV are measured, as well energy resolution LUX detector at those same energies. Additionally, there is interpretation existing measurements descriptions electron-ion recombination fluctuations liquid limiting cases a more general re-...
Various dark matter models predict annual and diurnal modulations of interaction rates in Earth-based experiments as a result the Earth's motion halo. Observation such features can provide generic evidence for detection interactions. This paper reports search both rate LUX experiment using over 20 calendar months data acquired between 2013 2016. focuses on electron recoil events at low energies, where leptophilic interactions are expected to occur DAMA has observed strong modulation two...
The LUX experiment has performed searches for dark-matter particles scattering elastically on xenon nuclei, leading to stringent upper limits the nuclear cross sections dark matter. Here, results derived from $1.4\ifmmode\times\else\texttimes\fi{}{10}^{4}\text{ }\text{ }\mathrm{kg}$ days of target exposure in 2013, details calibration, event-reconstruction, modeling, and statistical tests that underlie are presented. Detector performance is characterized, including measured efficiencies,...