A5082775971- Atomic and Subatomic Physics Research
- Quantum, superfluid, helium dynamics
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Nuclear physics research studies
- NMR spectroscopy and applications
- Advanced NMR Techniques and Applications
- Quantum Chromodynamics and Particle Interactions
- Superconducting Materials and Applications
- Particle Detector Development and Performance
- Nuclear reactor physics and engineering
- Particle Accelerators and Free-Electron Lasers
- Physics of Superconductivity and Magnetism
- Radioactive Decay and Measurement Techniques
- Surface and Thin Film Phenomena
- Advanced Frequency and Time Standards
- Inorganic Fluorides and Related Compounds
- Advanced Optical Sensing Technologies
- Medical Imaging Techniques and Applications
- Pentecostalism and Christianity Studies
- Contemporary Christian Leadership and Education
Le Moyne College
2015-2023
University of York
2020
University of South Carolina
2018
Thomas Jefferson National Accelerator Facility
2012-2017
National Institute of Standards and Technology
2005-2016
National Institute of Standards
2012
Indiana University Bloomington
2008-2010
U.S. Air Force Space Command
2008
International Atomic Energy Agency
2007
University of Washington
2005
This Letter reports the first scientific results from observation of antineutrinos emitted by fission products $^{235}\mathrm{U}$ at High Flux Isotope Reactor. PROSPECT, Precision Reactor Oscillation and Spectrum Experiment, consists a segmented 4 ton $^{6}\mathrm{Li}$-doped liquid scintillator detector covering baseline range 7--9 m reactor operating under less than 1 water equivalent overburden. Data collected during 33 live days operation nominal power 85 MW yield detection $25\text{...
The Precision Reactor Oscillation and Spectrum Experiment, PROSPECT, is designed to make a precise measurement of the antineutrino spectrum from highly-enriched uranium reactor probe eV-scale sterile neutrinos by searching for neutrino oscillations over meter-long distances. PROSPECT conceived as 2-phase experiment utilizing segmented $^6$Li-doped liquid scintillator detectors both efficient detection antineutrinos through inverse beta decay reaction excellent background discrimination....
If dark matter has mass lower than around 1 GeV, it will not impart enough energy to cause detectable nuclear recoils in many direct-detection experiments. However, if is upscattered high by collisions with cosmic rays, may be both experiments and neutrino We report the results of a dedicated search for boosted rays using PROSPECT reactor antineutrino experiment. show that such flux would display characteristic diurnal sidereal modulation, use this set new experimental constraints on sub-GeV...
The standard model predicts that, in addition to a proton, an electron, and antineutrino, continuous spectrum of photons is emitted the β decay free neutron. We report on RDK II experiment which measured photon using two different detector arrays. An annular array bismuth germanium oxide scintillators detected from 14 782 keV. spectral shape was consistent with theory, we determined branching ratio 0.00335±0.00005[stat]±0.00015[syst]. A second large area avalanche photodiodes directly 0.4...
A joint determination of the reactor antineutrino spectra resulting from fission ^{235}U and ^{239}Pu has been carried out by Daya Bay PROSPECT Collaborations. This Letter reports level consistency spectrum measurements two experiments presents new results a analysis both data sets. The are found to be consistent. combined reduces degeneracy between dominant isotopes improves uncertainty spectral shape about 3%. energy unfolded jointly deconvolved using Wiener-SVD unfolding method, providing...
We report an upper bound on parity-violating neutron spin rotation in $^{4}\mathrm{He}$. This experiment is the most sensitive search for neutron-weak optical activity yet performed and represents a significant advance precision comparison to past measurements heavy nuclei. The was at NG-6 slow-neutron beamline National Institute of Standards Technology (NIST) Center Neutron Research. Our result angle per unit length $^{4}\mathrm{He}$...
This paper describes the design and performance of a 50 liter, two-segment $^{6}$Li-loaded liquid scintillator detector that was designed operated as prototype for PROSPECT (Precision Reactor Oscillation Spectrum) Experiment. The constructed according to specifications experiment. It features low-mass optical separators, an integrated source calibration system, materials are compatible with $^{6}$Li-doped developed by PROSPECT. We demonstrate high light collection 850$\pm$20 PE/MeV, energy...
We report the first beam-target double-polarization asymmetries in γ+n(p)→π^{-}+p(p) reaction spanning nucleon resonance region from invariant mass W=1500 to 2300 MeV. Circularly polarized photons and longitudinally deuterons solid hydrogen deuteride (HD) have been used with CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. The exclusive final state has extracted using three very different analyses that show excellent agreement, these deduce E polarization observable for an...
Current models of antineutrino production in nuclear reactors predict detection rates and spectra at odds with the existing body direct reactor measurements. High-resolution detectors operated close to compact research cores can produce new precision measurements useful testing explanations for these observed discrepancies involving underlying or physics. Absolute measurement 235U-produced spectrum provide additional constraints evaluating accuracy current future models, while relative...
This work reports the production and characterization of lithium-loaded liquid scintillator (LiLS) for Precision Reactor Oscillation Spectrum Experiment (PROSPECT) . Fifty-nine 90 liter batches LiLS (6Li mass fraction 0.082%±0.001%) were produced samples from all characterized by measuring their optical absorbance relative to air, light yield a pure reference, pulse shape discrimination capability. Fifty-seven passed quality assurance criteria used PROSPECT experiment.
Abstract The precision reactor oscillation and spectrum experiment, PROSPECT, has made world-leading measurements of antineutrinos at short baselines. In its first phase, conducted the high flux isotope (HFIR) Oak Ridge National Laboratory, PROSPECT produced some strongest limits on eV-scale sterile neutrinos, a measurement antineutrino from 235 U, demonstrated observation in an aboveground detector with good energy resolution well-controlled backgrounds. collaboration is now preparing...
A meter-long, 23-liter EJ-309 liquid scintillator detector has been constructed to study the light collection and pulse-shape discrimination performance of elongated cells for PROSPECT reactor antineutrino experiment. The magnitude uniformity neutron/gamma power in energy range inverse beta decay products have studied using gamma spontaneous fission calibration sources deployed along cell long axis. We also neutron-gamma abilities differing PMT reflector configurations. Key design features...
A chromium wire-grid duplexer polarizer for CO2 lasers has been developed using holographic and chemical etching techniques. The reflection transmission measurements show reasonably good agreement with the theory.
We present the design, description, calibration procedure, and an analysis of systematic effects for apparatus designed to measure rotation plane polarization a transversely polarized slow neutron beam as it passes through unpolarized matter. This device is optical equivalent crossed polarizer/analyzer pair familiar from light optics. has been used search parity violation in interaction neutrons Given brightness existing sources, this capable measuring rotary power dϕ/dz = 1 × 10−7 rad/m.
PROSPECT, the Precision Reactor Oscillation and SPECTrum experiment, is a short-baseline reactor antineutrino experiment designed to provide precision measurements of 235U product e spectrum, utilizing an optically segmented 4-ton liquid scintillator detector. PROSPECT's segmentation system, optical grid, plays central role in reconstructing position energy interactions This paper technical reference for this PROSPECT subsystem, describing its design, fabrication, quality assurance,...