A5053318136- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Nuclear reactor physics and engineering
- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- Nuclear physics research studies
- Neutrino Physics Research
- Nuclear Materials and Properties
- Quantum, superfluid, helium dynamics
- Medical Imaging Techniques and Applications
- Astro and Planetary Science
- Cosmology and Gravitation Theories
- Radiation Therapy and Dosimetry
- Superconducting Materials and Applications
- Astrophysics and Cosmic Phenomena
- X-ray Spectroscopy and Fluorescence Analysis
- Particle Accelerators and Free-Electron Lasers
- Geomagnetism and Paleomagnetism Studies
- Scientific Research and Discoveries
- Quantum Chromodynamics and Particle Interactions
- Atmospheric Ozone and Climate
- Solar and Space Plasma Dynamics
- Atomic and Molecular Physics
University of Coimbra
2016-2025
LIP - Laboratory of Instrumentation and Experimental Particle Physics
2004-2024
University of Edinburgh
2009-2024
Centro De Medicina Veterinária Anjos De Assis
2023
University of Aveiro
2023
National Research Nuclear University MEPhI
2017-2019
University of California, Berkeley
2017
Strategic Insight (United States)
2017
IMS Nanofabrication (Austria)
2017
Institute for Basic Science
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...
LUX-ZEPLIN (LZ) is a next-generation dark matter direct detection experiment that will operate 4850 feet underground at the Sanford Underground Research Facility (SURF) in Lead, South Dakota, USA. Using two-phase xenon detector with an active mass of 7 tonnes, LZ search primarily for low-energy interactions weakly interacting massive particles (WIMPs), which are hypothesized to make up our galactic halo. In this paper, projected WIMP sensitivity presented based on latest background estimates...
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 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)...
The design and performance of the LUX-ZEPLIN (LZ) detector is described as March 2015 in this Conceptual Design Report. LZ a second-generation dark-matter with potential for unprecedented sensitivity to weakly interacting massive particles (WIMPs) masses from few GeV/c2 hundreds TeV/c2. With total liquid xenon mass about 10 tonnes, will be most sensitive experiment WIMPs region by end decade. This report describes detail technical systems. Expected backgrounds are quantified presented....
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...
In this Technical Design Report (TDR) we describe the LZ detector to be built at Sanford Underground Research Facility (SURF). The dark matter experiment is designed achieve sensitivity a WIMP-nucleon spin-independent cross section of three times ten negative forty-eighth square centimeters.
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...
We present the Migdal In Galactic Dark mAtter expLoration (MIGDAL) experiment aiming at unambiguous observation and study of so-called effect induced by fast-neutron scattering. It is hoped that this elusive atomic process can be exploited to enhance reach direct dark matter search experiments lower masses, but it still lacking experimental confirmation. Our goal detect predicted electron emission which thought accompany nuclear scattering with low, calculable, probability, deploying an...
In this Technical Design Report (TDR) we describe the NEXT-100 detector that will search for neutrinoless double beta decay (ββ0ν) in 136XE at Laboratorio Subterráneo de Canfranc (LSC), Spain. The document formalizes design presented our Conceptual (CDR): an electroluminescence time projection chamber, with separate readout planes calorimetry and tracking, located, respectively, behind cathode anode. is designed to hold a maximum of about 150 kg xenon 15 bar, or 100 10 bar. This option...
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...
A high-resolution measurement of the neutron-induced fission cross section $^{234}\mathrm{U}$ and $^{237}\mathrm{Np}$ has been performed at CERN Neutron Time-of-Flight facility. The sections have determined in a wide energy range from 1 eV to GeV using evaluated $^{235}\mathrm{U}$ as reference. In these measurements determination for resonances could be improved, whereas previous discrepancies were confirmed. New cross-section data are provided high neutron energies that go beyond limits...
The cross section of the reaction $^{197}\mathrm{Au}$($n,\ensuremath{\gamma}$) was measured with time-of-flight technique at n_TOF (neutron time-of-flight) facility in unresolved resonance region between 5 and 400 keV using a pair ${\mathrm{C}}_{6}$D${}_{6}$ (where D denotes $^{2}\mathrm{H}$) liquid scintillators for detection prompt capture $\ensuremath{\gamma}$ rays. results total uncertainty $3.9%--6.7$$%$ resolution 20 bins per energy decade show fair agreement Evaluated Nuclear Data...