T. Pershing
A5068506400- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Radiation Detection and Scintillator Technologies
- Astrophysics and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Quantum, superfluid, helium dynamics
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Nuclear Physics and Applications
- Cosmology and Gravitation Theories
- Atmospheric Ozone and Climate
- Nuclear physics research studies
- Astronomical Observations and Instrumentation
- Scientific Research and Discoveries
- Advanced biosensing and bioanalysis techniques
- Ionosphere and magnetosphere dynamics
- Geophysics and Sensor Technology
- Advanced Frequency and Time Standards
- X-ray Spectroscopy and Fluorescence Analysis
- Photocathodes and Microchannel Plates
- Advanced Optical Sensing Technologies
- High-pressure geophysics and materials
- Inertial Sensor and Navigation
- High-Energy Particle Collisions Research
Lawrence Livermore National Security
2023-2024
Lawrence Livermore National Laboratory
2022-2024
University of Edinburgh
2024
University of California, Davis
2015-2021
Campbell Collaboration
2018
Abstract New developments in liquid scintillators, high-efficiency, fast photon detectors, and chromatic sorting have opened up the possibility for building a large-scale detector that can discriminate between Cherenkov scintillation signals. Such could reconstruct particle direction species using light while also having excellent energy resolution low threshold of scintillator detector. Situated deep underground, utilizing new techniques computing reconstruction, this achieve unprecedented...
The Migdal effect predicts that a nuclear recoil interaction can be accompanied by atomic ionization, allowing many dark matter direct detection experiments to gain sensitivity sub-GeV masses. We report the first search for M- and L-shell electrons in liquid xenon using recoils produced tagged neutron scatters. Despite an observed background rate lower than of expected signals region interest, we do not observe signal consistent with predictions. discuss possible explanations, including...
A measurement of the $^{8}\mathrm{B}$ solar neutrino flux has been made using a 69.2 kt-day dataset acquired with $\mathrm{SNO}+$ detector during its water commissioning phase. At energies above 6 MeV is an extremely pure sample elastic scattering events, owing primarily to detector's deep location, allowing accurate relatively little exposure. In that energy region best fit background rate $0.2{5}_{\ensuremath{-}0.07}^{+0.09}\text{ }\text{...
Abstract The Accelerator Neutrino Neutron Interaction Experiment (ANNIE) is a 26-ton water Cherenkov neutrino detector installed on the Booster Beam (BNB) at Fermilab. Its main physics goals are to perform measurement of neutron yield from neutrino-nucleus interactions, as well charged-current cross section muon neutrinos. An equally important focus research and development new technologies target media. Specifically, water-based liquid scintillator (WbLS) interest novel medium, it allows...
Thermal noise resulting from the mechanical loss of multilayer dielectric coatings is expected to impose a limit sensitivities precision measurement systems used in fundamental and applied science. In case gravitational wave astronomy, future interferometric detectors are likely operate at cryogenic temperatures reduce such thermal ameliorate loading effects, with desirable thermomechanical properties silicon making it an attractive mirror substrate choice for this purpose. For use...
Detection of light signals is crucial to a wide range particle detectors. In particular, efficient detection vacuum ultraviolet (VUV) will provide new opportunities for some novel detectors currently being developed, but technically challenging. this article, we characterized the performance Hamamatsu VUV4 silicon photomultipliers (SiPMs) detecting VUV argon scintillation without wavelength shifting. Using customized cryogenic amplifier design, operated two models SiPMs inside liquid and...
The Migdal effect predicts that a nuclear recoil interaction can be accompanied by atomic ionization, allowing many dark matter direct detection experiments to gain sensitivity sub-GeV masses. We report the first search for M- and L-shell electrons in liquid xenon using 7.0$\pm$1.6 keV recoils produced tagged neutron scatters. Despite an observed background rate lower than of expected signals region interest, we do not observe signal consistent with predictions. discuss possible...
Liquid argon detectors are employed in a wide variety of nuclear and particle physics experiments. The addition small quantities xenon to modifies its scintillation, ionization, electroluminescence properties can improve performance as detection medium. However, liquid argon-xenon mixture develop instabilities, especially systems that require phase transitions or utilize high concentrations. In this work, we analyze the causes these instabilities describe (liter-scale) apparatus with unique...
The $\mathrm{SNO}+$ experiment collected data as a low-threshold water Cherenkov detector from September 2017 to July 2019. Measurements of the 2.2-MeV $\ensuremath{\gamma}$'s produced by neutron capture on hydrogen were made using an Am-Be calibration source, for which large fraction emitted neutrons are simultaneously with 4.4-MeV $\ensuremath{\gamma}$. Analysis delayed coincidence between $\ensuremath{\gamma}$ and revealed detection efficiency that is centered around 50% varies at level...
SNO+ is a large-scale liquid scintillator experiment with the primary goal of searching for neutrinoless double beta decay, and located approximately 2 km underground in SNOLAB, Sudbury, Canada. The detector acquired data two years as pure water Cherenkov detector, starting May 2017. During this period, optical properties were measured situ using deployed light diffusing sphere, improving model energy response systematic uncertainties. parameters included attenuation coefficients, effective...
Liquid xenon-based direct detection dark matter experiments have recently expanded their searches to include high-energy nuclear recoil events as motivated by effective field theory and inelastic interaction models, but few xenon calibrations above 100 keV are currently available. In this work, we measured the scintillation ionization yields of recoils up 426 keV. The experiment uses 14.1 MeV neutrons scatter off in a compact liquid time projection chamber produce quasimonoenergetic between...
The Accelerator Neutrino Neutron Interaction Experiment (ANNIE) is a 26-ton water Cherenkov neutrino detector installed on the Booster Beam (BNB) at Fermilab. Its main physics goals are to perform measurement of neutron yield from neutrino-nucleus interactions, as well charged-current cross section muon neutrinos. An equally important focus placed research and development new technologies target media. Specifically water-based liquid scintillator (WbLS) interest novel medium, it allows for...
When monitoring a reactor site for nuclear nonproliferation purposes, the presence of an unknown or hidden could be obscured by activities known much greater power nearby. Thus when observation antineutrino emissions, one must discriminate background fluxes from possible signals under investigation. To quantify this discrimination, we find confidence to reject (null) hypothesis single proximal reactor, exploiting directional in second, reactor. In particular, simulate inverse beta decay...
SNO+ is a multipurpose neutrino experiment located approximately 2 km underground in SNOLAB, Sudbury, Canada. The detector started taking physics data May 2017 and currently completing its first phase, as pure water Cherenkov detector. low trigger threshold of the allows for substantial neutron detection efficiency, observed with deployed ^{241}Am^{9}Be source. Using statistical analysis one hour AmBe calibration data, we report capture constant 208.2 + 2.1(stat.) us lower bound efficiency...
Liquid xenon-based direct detection dark matter experiments have recently expanded their searches to include high-energy nuclear recoil events as motivated by effective field theory and inelastic interaction models, but few xenon calibrations above 100 keV are currently available. In this work, we measured the scintillation ionization yields of recoils up 426 keV. The experiment uses 14.1 MeV neutrons scatter off in a compact liquid time projection chamber produce quasi-monoenergetic between...
Liquid argon detectors are employed in a wide variety of nuclear and particle physics experiments. The addition small quantities xenon to modifies its scintillation, ionization, electroluminescence properties can improve performance as detection medium. However, liquid argon-xenon mixture develop instabilities, especially systems that require phase transitions or utilize high concentrations. In this work, we discuss the causes for such instabilities describe (liter-scale) apparatus with...