C. E. Dahl
A5003483180- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- Neutrino Physics Research
- Cosmology and Gravitation Theories
- Radiation Detection and Scintillator Technologies
- Radiation Therapy and Dosimetry
- Nuclear Physics and Applications
- Astrophysics and Cosmic Phenomena
- Quantum Chromodynamics and Particle Interactions
- Advanced Thermodynamics and Statistical Mechanics
- Quantum, superfluid, helium dynamics
- Nuclear reactor physics and engineering
- High-Energy Particle Collisions Research
- Computational Physics and Python Applications
- Scientific Research and Discoveries
- Ion-surface interactions and analysis
- Atomic and Molecular Physics
- Nuclear and radioactivity studies
- Inertial Sensor and Navigation
- Archaeology and Cultural Heritage
- Inorganic Fluorides and Related Compounds
- Advanced X-ray and CT Imaging
- Cardiac Arrest and Resuscitation
Fermi National Accelerator Laboratory
2015-2025
Northwestern University
2013-2024
The University of Texas at Austin
2024
University at Albany, State University of New York
2019
Case Western Reserve University
2005-2013
University of Chicago
2010-2012
Princeton University
2005-2011
Indiana University South Bend
2010
Brown University
2010
Iowa City Public Library
1985
The XENON10 experiment at the Gran Sasso National Laboratory uses a 15 kg xenon dual phase time projection chamber (XeTPC) to search for dark matter weakly interacting massive particles (WIMPs). detector measures simultaneously scintillation and ionization produced by radiation in pure liquid xenon, discriminate signal from background down 4.5 keV nuclear recoil energy. A blind analysis of 58.6 live days data, acquired between October 6, 2006 February 14, 2007, using fiducial mass 5.4 kg,...
We report results of a search for light (<10 GeV) particle dark matter with the XENON10 detector. The event trigger was sensitive to single electron, analysis threshold 5 electrons corresponding 1.4 keV nuclear recoil energy. Considering spin-independent matter-nucleon scattering, we exclude cross sections \sigma_n>3.5x10^{-42} cm^2, mass m_{\chi}=8 GeV. find that our data strongly constrain recent elastic interpretations excess low-energy events observed by CoGeNT and CRESST-II, as well...
The LUX-ZEPLIN experiment is a dark matter detector centered on dual-phase xenon time projection chamber operating at the Sanford Underground Research Facility in Lead, South Dakota, USA. This Letter reports results from LUX-ZEPLIN's first search for weakly interacting massive particles (WIMPs) with an exposure of 60~live days using fiducial mass 5.5 t. A profile-likelihood ratio analysis shows data to be consistent background-only hypothesis, setting new limits spin-independent...
New data are reported from the operation of a 4.0 kg CF$_{3}$I bubble chamber in 6800-foot-deep SNOLAB underground laboratory. The effectiveness ultrasound analysis discriminating alpha-decay background events single nuclear recoils has been confirmed, with lower bound $>$99.3% rejection events. Twenty recoil event candidates and three multiple were observed during total exposure 553 kg-days distributed over different nucleation thresholds. effective for recoil-like was 437.4 kg-days. A...
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...
New results are reported from the operation of PICO-60 dark matter detector, a bubble chamber filled with 52 kg C_{3}F_{8} located in SNOLAB underground laboratory. As previous PICO chambers, exhibits excellent electron recoil and alpha decay rejection, observed multiple-scattering neutron rate indicates single-scatter background less than one event per month. A blind analysis an efficiency-corrected 1167-kg day exposure at 3.3-keV thermodynamic threshold reveals no single-scattering nuclear...
New data are reported from the operation of a 2 liter ${\mathrm{C}}_{3}{\mathrm{F}}_{8}$ bubble chamber in SNOLAB underground laboratory, with total exposure 211.5 kg days at four different energy thresholds below 10 keV. These show that provides excellent electron-recoil and alpha rejection capabilities very low thresholds. The exhibits an sensitivity $<3.5\ifmmode\times\else\texttimes\fi{}1{0}^{\ensuremath{-}10}$ factor $>98.2%$. also include first observation dependence acoustic signal on...
Final results are reported from operation of the PICO-60 C$_3$F$_8$ dark matter detector, a bubble chamber filled with 52 kg located in SNOLAB underground laboratory. The was operated at thermodynamic thresholds as low 1.2 keV without loss stability. A new blind 1404-kg-day exposure 2.45 threshold acquired approximately same expected total background rate previous 1167-kg-day 3.3 keV. This increased is enabled part by optical tracking analysis to better identify events near detector walls,...
XENON10 is an experiment to directly detect weakly interacting massive particles (WIMPs), which may comprise the bulk of nonbaryonic dark matter in our Universe. We report new results for spin-dependent WIMP-nucleon interactions with $^{129}\mathrm{Xe}$ and $^{131}\mathrm{Xe}$ from 58.6 live days operation at Laboratori Nazionali del Gran Sasso. Based on nonobservation a WIMP signal 5.4 kg fiducial liquid xenon mass, we exclude previously unexplored regions theoretically allowed parameter...
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....
The PICO collaboration reports results obtained by PICO-2L Run-2 after carefully controlling for particulate contamination. data clearly indicates that previously observed anomalies were due to contamination in the bubble chamber fluid. These observations set new bounds on spin-dependent scattering of dark matter, and help pave way larger scale experiments.
Data from the operation of a bubble chamber filled with 3.5 kg CF3I in shallow underground site are reported. An analysis ultrasound signals accompanying nucleations confirms that alpha decays generate significantly louder acoustic emission than single nuclear recoils, leading to an efficient background discrimination. Three dark matter candidate events were observed during effective exposure 28.1 day, consistent neutron background. This observation provides strong direct detection...
New data are reported from the operation of PICO-60 dark matter detector, a bubble chamber filled with 36.8 kg CF$_3$I and located in SNOLAB underground laboratory. is largest to search for date. With an analyzed exposure 92.8 livedays, exhibits same excellent background rejection observed smaller chambers. Alpha decays exhibit frequency-dependent acoustic calorimetry, similar but not identical that recently C$_3$F$_8$ chamber. also observes large population unknown events, exhibiting...
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.
The European Spallation Source (ESS), presently well on its way to completion, will soon provide the most intense neutron beams for multi-disciplinary science. Fortuitously, it also generate largest pulsed neutrino flux suitable detection of Coherent Elastic Neutrino-Nucleus Scattering (CE$\nu$NS), a process recently measured first time at ORNL's Neutron Source. We describe innovative detector technologies maximally able profit from order-of-magnitude increase in provided by ESS, along with...
Presented here is the design of Mechanical Ventilator Milano (MVM), a novel mechanical ventilator designed for rapid mass production in response to COVID-19 pandemic address urgent shortage intensive therapy ventilators many countries, and growing difficulty procuring these devices through normal supply chains across borders. This an electro-mechanical equivalent old reliable Manley Ventilator, able operate both pressure-controlled pressure-supported ventilation modes. MVM optimized...
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...
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...
We report the first measurements of absolute ionization yield nuclear recoils in liquid xenon, as a function energy and electric field. Independent experiments were carried out with two dual-phase time-projection chamber prototypes, developed for XENON dark matter project. find that charge increases decreasing recoil energy, exhibits only weak field dependence. These results are unambiguous demonstration capability xenon detectors to discriminate between electron down 20 keV, key requirement...
It has been suggested that dark matter particles which scatter inelastically from detector target nuclei could explain the apparent incompatibility of DAMA modulation signal (interpreted as evidence for particle matter) with null results CDMS-II and XENON10. Among predictions interacting are a suppression low-energy events, population nuclear recoil events at higher equivalent energies. This is in stark contrast to well-known expectation falling exponential spectrum case elastic...
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...