A5084680358- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Neutrino Physics Research
- Cosmology and Gravitation Theories
- Radiation Detection and Scintillator Technologies
- Astrophysics and Cosmic Phenomena
- Nuclear Physics and Applications
- Scientific Research and Discoveries
- Radiation Therapy and Dosimetry
- Quantum, superfluid, helium dynamics
- Quantum Chromodynamics and Particle Interactions
- Indoor and Outdoor Localization Technologies
- Anomaly Detection Techniques and Applications
- Spacecraft and Cryogenic Technologies
- Medical Imaging Techniques and Applications
- Heat Transfer and Numerical Methods
- Health, Environment, Cognitive Aging
- GaN-based semiconductor devices and materials
- High-Energy Particle Collisions Research
- Advanced Data Processing Techniques
- Vehicle Dynamics and Control Systems
- Nuclear reactor physics and engineering
- Computational Physics and Python Applications
South Dakota Science and Technology Authority
2017-2025
University of California, Berkeley
2016-2025
Sanford Research
2021-2023
Lawrence Berkeley National Laboratory
2016-2021
Yale University
2013-2021
University of Michigan
2019-2020
Pennsylvania State University
2018
University of Kassel
2018
University of California, Santa Barbara
2017
University of Edinburgh
2017
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 final results of the EDELWEISS-I dark matter search using cryogenic heat-and-ionization Ge detectors are presented. data sample corresponds to an increase by a factor 5 in exposure relative previously published results. A recoil energy threshold 13 keV or better was achieved with three 320 g working simultaneously over four months stable operation. Limits on spin-independent cross section for scattering weakly interacting massive particle nucleon derived from accumulated fiducial...
The ZEPLIN-III experiment in the Palmer Underground Laboratory at Boulby uses a 12 kg two-phase xenon time-projection chamber to search for weakly interacting massive particles (WIMPs) that may account dark matter of our Galaxy. detector measures both scintillation and ionization produced by radiation liquid differentiate between nuclear recoils expected from WIMPs electron-recoil background signals down $\ensuremath{\sim}10\text{ }\text{ }\mathrm{keV}$ nuclear-recoil energy. An analysis...
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)...
We report experimental upper limits on WIMP-nucleon elastic scattering cross sections from the second science run of ZEPLIN-III at Boulby Underground Laboratory. A raw fiducial exposure 1344 kg⋅days was accrued over 319 days continuous operation between June 2010 and May 2011. total eight events observed in signal acceptance region nuclear recoil energy range 7–29 keV, which is compatible with background expectations. This allows exclusion scalar cross-section above 4.8×10−8 pb near 50...
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...
Following the first science results of LUX-ZEPLIN (LZ) experiment, a dual-phase xenon time projection chamber operating from Sanford Underground Research Facility in Lead, South Dakota, USA, we report initial limits on model-independent nonrelativistic effective field theory describing complete set possible interactions weakly interacting massive particle (WIMP) with nucleon. These utilize same 5.5 t fiducial mass and 60 live days exposure collected for LZ spin-independent spin-dependent...
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 LUX-ZEPLIN experiment recently reported limits on WIMP-nucleus interactions from its initial science run, down to $6.5\times10^{-48}$ cm$^2$ for the spin-independent interaction of a 30 GeV/c$^2$ WIMP at 90% confidence level. In this paper, we present comprehensive analysis backgrounds important result and other upcoming physics analyses, including neutrinoless double-beta decay searches effective field theory interpretations data. We confirm that in-situ determinations bulk fixed...
The LUX-ZEPLIN (LZ) experiment is a dark matter detector centered on dual-phase xenon time projection chamber. We report searches for new physics appearing through few-keV-scale electron recoils, using the experiment's first exposure of 60 live days and fiducial mass 5.5 t. data are found to be consistent with background-only hypothesis, limits set models including solar axion coupling, neutrino magnetic moment millicharge, couplings galactic axionlike particles hidden photons. Similar...
Searches for dark matter with liquid xenon time projection chamber experiments have traditionally focused on the region of parameter space that is characteristic weakly interacting massive particles, ranging from a few GeV/$c^2$ to TeV/$c^2$. Models mass much heavier than this are well motivated by early production mechanisms different standard thermal freeze-out, but they generally been less explored experimentally. In work, we present re-analysis first science run (SR1) LZ experiment, an...
We studied the application of statistical reconstruction algorithms, namely maximum likelihood and least squares methods, to problem event in a dual phase liquid xenon detector. An iterative method was developed for in-situ PMT light response functions from calibration data taken with an uncollimated gamma-ray source. Using techniques described, performance ZEPLIN-III dark matter detector 122 keV gamma-rays. For inner part (R<100 mm), spatial resolutions 13 mm 1.6 FWHM were measured...
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...
Dual-phase xenon time projection chamber (TPC) detectors offer heightened sensitivities for dark matter detection across a spectrum of particle masses. To broaden their capability to low-mass interactions, we investigated the light and charge responses liquid (LXe) sub-keV nuclear recoils. Using neutron events from pulsed Adelphi Deuterium-Deuterium generator, an in situ calibration was conducted on LUX detector. We demonstrate direct measurements yields down 0.45 0.27 keV, respectively,...
We present new experimental constraints on the WIMP-nucleon spin-dependent elastic cross sections using data from first science run of ZEPLIN-III, a two-phase xenon experiment searching for galactic dark matter weakly interacting massive particles based at Boulby mine. Analysis ∼450 kg·days fiducial exposure allow us to place 90%-confidence upper limit pure WIMP-neutron section σn=1.9×10−2 pb 55 GeV/c2 WIMP mass. Recent calculations nuclear spin structure Bonn charge-dependent...
Scintillation and ionisation yields for nuclear recoils in liquid xenon above 10 keVnr (nuclear recoil energy) are deduced from data acquired using broadband Am-Be neutron sources. The several exposures to two sources were compared detailed simulations. Energy-dependent scintillation giving acceptable fits the derived. Efficiency resolution effects treated a light collection Monte Carlo, measured photomultiplier response profiles hardware trigger studies. A gradual fall yield below ~40 is...