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Author: Patrick Phelps Publisher: ISBN: Category : Astrophysics Languages : en Pages : 191
Book Description
Dark matter, the mysterious substance that seems to make up most of the mass of the universe, has never been detected in the laboratory. In this document I outline the current world's leading experiment, LUX, to look for a class of dark matter, the Weakly Interacting Massive Particle. I outline the general principles of searching for dark matter through low background detectors and event rejection, I move on to a description of the LUX experiment and its performance, reviewing its internal structure and subsystems including a novel heat exchange system that expedited system readiness and resulted in a stable platform for WIMP searching. The LUX energy reconstruction is then examined, followed by a breakdown of signal fluctuations as a function of energy as part of our understanding of back- ground discrimination in this class of detectors. Finally, I review the first LUX WIMP search result, culminating in the world's most sensitive limit on the spin- independent WIMP-nucleon cross section, before moving to a discussion of next steps in the search for dark matter for LUX and next generational experiments.
Author: Patrick Phelps Publisher: ISBN: Category : Astrophysics Languages : en Pages : 191
Book Description
Dark matter, the mysterious substance that seems to make up most of the mass of the universe, has never been detected in the laboratory. In this document I outline the current world's leading experiment, LUX, to look for a class of dark matter, the Weakly Interacting Massive Particle. I outline the general principles of searching for dark matter through low background detectors and event rejection, I move on to a description of the LUX experiment and its performance, reviewing its internal structure and subsystems including a novel heat exchange system that expedited system readiness and resulted in a stable platform for WIMP searching. The LUX energy reconstruction is then examined, followed by a breakdown of signal fluctuations as a function of energy as part of our understanding of back- ground discrimination in this class of detectors. Finally, I review the first LUX WIMP search result, culminating in the world's most sensitive limit on the spin- independent WIMP-nucleon cross section, before moving to a discussion of next steps in the search for dark matter for LUX and next generational experiments.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Here, we 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 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 reanalysis of the LUX run 3 weakly interacting massive particle search.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
The grant supported research on an experimental search for evidence of dark matter interactions with normal matter. The PI carried out the research as a member of the LUX and LZ collaborations. The LUX research team collected a first data set with the LUX experiment, a large liquid xenon detector installed in the Sanford Underground Research Facility (SURF). The first results were published in Physical Review Letters on March 4, 2014. The journal Nature named the LUX result a scientific highlight of the year for 2013. In addition, the LZ collaboration submitted the full proposal for the Lux Zeplin experiment, which has since been approved by DOE-HEP as a second-generation dark matter experiment. Witherell is the Level 2 manager for the Outer Detector System on the LUX-Zeplin experiment.
Author: Publisher: ISBN: Category : Languages : en Pages : 3
Book Description
We present the status and prospects of the LUX experiment, which employs approximately 300 kg of two-phase xenon to search for WIMP dark matter interactions. The LUX detector was commissioned at the surface laboratory of the Sanford Underground Research Facility in Lead, SD, between December 2011 and February 2012 and the detector has been operating underground since January, 2013. These proceedings review the results of the commissioning run as well as the status of underground data-taking.
Author: Daniel Kodroff Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Over the past half-century overwhelming evidence has mounted indicating the existence of a non-baryonic and enigmatic dark matter that constitutes approximately 85% of the total matter in the universe. Among the potential dark matter detection methods, dual- phase time projection chambers (TPCs) have emerged as the leading detector technology. LUX-ZEPLIN (LZ) is a direct detection dark matter experiment located at the 4850-ft depth level of the Sanford Underground Research Facility in South Dakota, USA, employing a 7 tonne active volume of liquid xenon in a dual-phase TPC. It's surrounded by an instrumented xenon "Skin" region and gadolinium-loaded liquid-scintillator outer detector, primarily serving as active vetoes for gamma-ray and neutron backgrounds, respectively, and contained within an ultra-pure water tank. The LZ detector began its first science run in December of 2021 and released its first results in the Summer of 2022. In order to ensure a low-background environment, a comprehensive material assay and selection campaign, for detector components, along with a xenon-purification campaign were pursued prior to and during construction. These mitigations have allowed LZ to achieve a background rate of 63.0 ± 4.5 x 10-6 events/keVee/kg/day in the low- energy region, approximately 60 times lower than that of its predecessor, the LUX experiment. LZ performed comprehensive measurements to constrain backgrounds in situ and construct a well-constrained time-dependent background model to use in searches for novel physics signals within this low-energy (
Author: Publisher: ISBN: Category : Languages : en Pages : 11
Book Description
LUX is a two-phase (liquid/gas) xenon time projection chamber designed to detect nuclear recoils resulting from interactions with dark matter particles. Signals from the detector are processed with an FPGA-based digital trigger system that analyzes the incoming data in real-time, with just a few microsecond latency. The system enables first pass selection of events of interest based on their pulse shape characteristics and 3D localization of the interactions. It has been shown to be >99% efficient in triggering on S2 signals induced by only few extracted liquid electrons. It is continuously and reliably operating since its full underground deployment in early 2013. This document is an overview of the systems capabilities, its inner workings, and its performance.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
The landscape of dark matter direct detection has been profoundly altered by the slew of recent experiments. While some have claimed signals consistent with dark matter, others have seen few, if any, events consistent with dark matter. The results of the putative detections are often incompatible with each other in the context of naive spin-independent scattering, as well as with the null results. In particular, in light of the conflicts between the DM interpretation of the three events recently reported by the CDMS-Si experiment and the first results of the LUX experiment, there is a strong need to revisit the assumptions that go into the DM interpretations of both signals and limits. We attempt to reexamine a number of particle physics, astrophysics and experimental uncertainties. Specifically, we examine exothermic scattering, isospin-dependent couplings, modified halo models through astrophysics independent techniques, and variations in the assumptions about the scintillation light in liquid Xenon. We find that only a highly tuned isospin-dependent scenario remains as a viable explanation of the claimed detections, unless the scintillation properties of LXe are dramatically different from the assumptions used by the LUX experiment.
Author: Publisher: ISBN: Category : Languages : en Pages : 3
Book Description
We report results from a search for weakly interacting dark matter particles obtained with the LUX experiment. LUX was located at a depth of 4850 feet at the Sanford Underground Research Facility in Lead, South Dakota from 2013 through 2016. It found no evidence for dark matter particle interactions and set new constraints on the properties of such particles for masses between 6 GeV and 100 TeV. The work reported here also characterized the performance of such experiments by developing a new calibration technique based upon a tritium beta decay source.
Author: Patrick Phelps
Author: Patrick Phelps
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Author: Umit Utku
Author: Sally Shaw
Author: Daniel Kodroff
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