1,062 research outputs found
Dark Matter Searches with the LUX Experiment
No full textThe Large Underground Xenon (LUX) experiment is a 350 kg liquid xenon time projection chamber (TPC) whose primary goal is to directly detect galactic Dark Matter in form of Weakly Interacting Massive Particles (WIMPs). The first LUX science search results based on 85.3\,day of data (Run3) collected in 2013 has set the best limit on spin-independent WIMP-nucleon cross section, reaching a minimum of 90\% CL for WIMP mass of 33\,GeV/. While presently collecting a 300-day data set (Run4), the LUX collaboration is also performing the re-analysis of the Run3 sample with new calibration measurements for nuclear and electronic recoil events, and additional improvements of the analysis methods. Dual phase xenon based TPCs, although optimised to observe WIMPs, are particularly suitable for exploration of alternative Dark Matter scenarios, such as axions and axion-like particles. The present status of the ongoing searches in LUX is also described
Background determination for the LUX-ZEPLIN dark matter experiment
No full textThe LUX-ZEPLIN experiment recently reported limits on WIMP-nucleus interactions from its initial science run, down to 9.2×10-48 cm2 for the spin-independent interaction of a 36 GeV/c2 WIMP at 90% confidence level. In this paper, we present a comprehensive analysis of the backgrounds important for this result and for other upcoming physics analyses, including neutrinoless double-beta decay searches and effective field theory interpretations of LUX-ZEPLIN data. We confirm that the in-situ determinations of bulk and fixed radioactive backgrounds are consistent with expectations from the ex-situ assays. The observed background rate after WIMP search criteria were applied was (6.3±0.5)×10-5 events/keVee/kg/day in the low-energy region, approximately 60 times lower than the equivalent rate reported by the LUX experiment
Searching for Dark Matter with the LUX experiment
No full textThe Large Underground Xenon (LUX) experiment completed its first physics run in 2013 and produced a world-leading limit for spin-independent scattering of Weakly Interacting Massive Particles using 85.3 live-days of data. After presenting these first results we discuss the detector development work and calibrations following the first physics run, the current status of LUX and plans for the future multi-ton LUX-ZEPLIN experiment
The Large Underground Xenon (LUX) Experiment
No full textThe Large Underground Xenon (LUX) collaboration has designed and constructed a dual-phase xenon detector, in order to conduct a search for Weakly Interacting Massive Particles(WIMPs), a leading dark matter candidate. The goal of the LUX detector is to clearly detect (or exclude) WIMPS with a spin independent cross section per nucleon of cm, equivalent to 1 event/100 kg/month in the inner 100-kg fiducial volume (FV) of the 370-kg detector. The overall background goals are set to have 1 background events characterized as possible WIMPs in the FV in 300 days of running. This paper describes the design and construction of the LUX detector.Peer Reviewe
Kr calibration of the 2013 LUX dark matter search
No full textLUX was the first dark matter experiment to use a Kr83m calibration source. In this paper, we describe the source preparation and injection. We also present several Kr83m calibration applications in the context of the 2013 LUX exposure, including the measurement of temporal and spatial variation in scintillation and charge signal amplitudes, and several methods to understand the electric field within the time projection chamber.Peer Reviewe
Tritium calibration of the LUX dark matter experiment
No full textWe present measurements of the electron-recoil (ER) response of the LUX dark matter detector based upon 170,000 highly pure and spatially-uniform tritium decays. We reconstruct the tritium energy spectrum using the combined energy model and find good agreement with expectations. We report the average charge and light yields of ER events in liquid xenon at 180 V/cm and 105 V/cm and compare the results to the NEST model. We also measure the mean charge recombination fraction and its fluctuations, and we investigate the location and width of the LUX ER band. These results provide input to a re-analysis of the LUX Run3 WIMP search
Toward a Biocommunicable Cartography of Health Decision-Making in the Amazon Basin of Ecuador
No full text© Copyright is owned by the author of this document. This Honors Project is brought to you for free and open access by Lux. It has been accepted for inclusion in Lawrence University Honors Projects by a
Position Reconstruction in LUX
No full textThe (x, y) position reconstruction method used in the analysis of the complete exposure of the Large Underground Xenon (LUX) experiment is presented. The algorithm is based on a statistical test that makes use of an iterative method to recover the photomultiplier tube (PMT) light response directly from the calibration data. The light response functions make use of a two dimensional functional form to account for the photons reflected on the inner walls of the detector. To increase the resolution for small pulses, a photon counting technique was employed to describe the response of the PMTs. The reconstruction was assessed with calibration data including 83mKr (releasing a total energy of 41.5 keV) and 3H (β− with Q = 18.6 keV) decays, and a deuterium-deuterium (D-D) neutron beam (2.45 MeV) . Within the detector's fiducial volume, the reconstruction has achieved an (x, y) position uncertainty of σ = 0.82 cm and σ = 0.17 cm for events of only 200 and 4,000 detected electroluminescence photons respectively. Such signals are associated with electron recoils of energies ~0.25 keV and ~10 keV, respectively. The reconstructed position of the smallest events with a single electron emitted from the liquid surface (22 detected photons) has a horizontal (x, y) uncertainty of 2.13 cm.Peer Reviewe
Lux Cumontiana F. Cumont, Lux Perpetua, volume édité par Bruno Rochette et André Motte avec la collaboration de Bastien Toune, Nino Aragno Editore Turin 2009 (réimpression de la Librairie orientaliste Paul Geuthner, Paris 1949)
No full textLabarre Guy. Lux Cumontiana F. Cumont, Lux Perpetua, volume édité par Bruno Rochette et André Motte avec la collaboration de Bastien Toune, Nino Aragno Editore Turin 2009 (réimpression de la Librairie orientaliste Paul Geuthner, Paris 1949). In: Dialogues d'histoire ancienne, vol. 39, n°1, 2013. pp. 279-283
Lux Cumontiana F. Cumont, Lux Perpetua, volume édité par Bruno Rochette et André Motte avec la collaboration de Bastien Toune, Nino Aragno Editore Turin 2009 (réimpression de la Librairie orientaliste Paul Geuthner, Paris 1949)
No full textLabarre Guy. Lux Cumontiana F. Cumont, Lux Perpetua, volume édité par Bruno Rochette et André Motte avec la collaboration de Bastien Toune, Nino Aragno Editore Turin 2009 (réimpression de la Librairie orientaliste Paul Geuthner, Paris 1949). In: Dialogues d'histoire ancienne, vol. 39, n°1, 2013. pp. 279-283
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