J. K. Gaison
A5072119914- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Nuclear Physics and Applications
- Particle Detector Development and Performance
- Nuclear physics research studies
- Nuclear reactor physics and engineering
- Scientific Research and Discoveries
- Methane Hydrates and Related Phenomena
- Medical Imaging Techniques and Applications
- Nonlinear Dynamics and Pattern Formation
- Nonlinear Waves and Solitons
- Quantum Chromodynamics and Particle Interactions
- Radiopharmaceutical Chemistry and Applications
- Atomic and Molecular Physics
- Atomic and Subatomic Physics Research
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Nonlinear Photonic Systems
- X-ray Spectroscopy and Fluorescence Analysis
- Atmospheric Ozone and Climate
- Mass Spectrometry Techniques and Applications
- Pulsars and Gravitational Waves Research
Johannes Gutenberg University Mainz
2023-2024
University of Washington
2023-2024
Pacific Northwest National Laboratory
2023-2024
Battelle
2024
Yale University
2015-2023
Drexel University
2015
The PROSPECT Collaboration presents their improved results with new limits on the oscillation of electron antineutrinos to light sterile neutrinos and energy spectrum measurements several short baselines.
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 absolute scale of the neutrino mass plays a critical role in physics at every scale, from subatomic to cosmological. Measurements tritium end-point spectrum have provided most precise direct limit on scale. In this Letter, we present advances by Project 8 cyclotron radiation emission spectroscopy (CRES) technique culminating first frequency-based limit. With only cm^{3}-scale physical detection volume, m_{β}<155 eV/c^{2} (152 eV/c^{2}) is extracted background-free measurement continuous...
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...
This Letter reports the first measurement of $^{235}$U $\overline{\nu_{e}}$ energy spectrum by PROSPECT, Precision Reactor Oscillation and Spectrum experiment, operating 7.9m from 85MW$_{\mathrm{th}}$ highly-enriched uranium (HEU) High Flux Isotope Reactor. With a surface-based, segmented detector, PROSPECT has observed 31678$\pm$304 (stat.) $\overline{\nu_{e}}$-induced inverse beta decays (IBD), largest sample HEU fission to date, 99% which are attributed $^{235}$U. Despite broad agreement,...
Neutrino mass is a key parameter in nuclear and particle physics cosmology. The Project 8 Collaboration developed an innovative method with potential to improve the current limits by more than order of magnitude. Announced paper published last September (PRL 131, 102502; see also Synopsis at https://physics.aps.org/articles/v16/s121), measures frequency radiation from tritium $\ensuremath{\beta}$-decay electrons spiraling magnetic field. In authors provide details this unique measurement...
We consider the evolution of small amplitude, long wavelength initial data by a polyatomic Fermi--Pasta--Ulam lattice differential equation whose material properties vary periodically. Using methods homogenization theory, we prove rigorous estimates that show solution breaks up into linear superposition two appropriately scaled and modulated counter-propagating waves, each which solves Korteweg--de Vries equation, plus error. The are valid over very time scales.
This Letter reports one of the most precise measurements to date antineutrino spectrum from a purely 235U-fueled reactor, made with final dataset PROSPECT-I detector at High Flux Isotope Reactor. By extracting information previously unused segments, this analysis effectively doubles statistics previous PROSPECT measurement. The reconstructed energy is unfolded into and compared both Huber-Mueller model commercial reactor burning multiple fuel isotopes. A local excess over observed in 5–7 MeV...
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...
The PROSPECT and STEREO collaborations present a combined measurement of the pure ^{235}U antineutrino spectrum, without site specific corrections or detector-dependent effects. spectral measurements two highest precision experiments at research reactors are found to be compatible with χ^{2}/ndf=24.1/21, allowing joint unfolding prompt energy into energy. This ν[over ¯]_{e} spectrum is provided community, an excess events relative Huber model in 5-6 MeV region. When Gaussian bump fitted...
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...
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...
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,...
The objective of the Cyclotron Radiation Emission Spectroscopy (CRES) technology is to build precise particle energy spectra. This achieved by identifying start frequencies charged trajectories which, when exposed an external magnetic field, leave semi-linear profiles (called tracks) in time-frequency plane. Due need for excellent instrumental resolution application, highly efficient and accurate track reconstruction methods are desired. Deep learning convolutional neural networks (CNNs) -...
Reactor neutrino experiments have seen major improvements in precision recent years. With the experimental uncertainties becoming lower than those from theory, carefully considering all sources of $\overline{\nu}_{e}$ is important when making theoretical predictions. One source that often neglected arises irradiation nonfuel materials reactors. The rates and energies these vary widely based on reactor type, configuration, sampling stage during cycle to be considered for each experiment...
We comment on the claimed observation [arXiv:arXiv:2005.05301] of sterile neutrino oscillations by Neutrino-4 collaboration. Such a claim, which requires existence new fundamental particle, demands level rigor commensurate with its impact. The burden lies collaboration to provide information necessary prove validity their claim community. In this note, we describe aspects both data and analysis method that might lead an oscillation signature arising from null experiment additional needed...
Abstract The objective of the cyclotron radiation emission spectroscopy (CRES) technology is to build precise particle energy spectra. This achieved by identifying start frequencies charged trajectories which, when exposed an external magnetic field, leave semi-linear profiles (called tracks) in time–frequency plane. Due need for excellent instrumental resolution application, highly efficient and accurate track reconstruction methods are desired. Deep learning convolutional neural networks...