A. B. Hansell
A5000380801- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Particle Detector Development and Performance
- Sport and Mega-Event Impacts
- Particle Accelerators and Free-Electron Lasers
- Physical Education and Pedagogy
- Medical Imaging Techniques and Applications
- Nuclear physics research studies
- Sports, Gender, and Society
Susquehanna University
2023-2025
West Virginia University
2022
Temple University
2018-2022
University of Wisconsin–Madison
2019
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{...
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 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...
The PROSPECT experiment is designed to perform precise searches for antineutrino disappearance at short distances (7–9 m) from compact nuclear reactor cores. This Letter reports results a new neutrino oscillation analysis performed using the complete data sample PROSPECT-I detector operated High Flux Isotope Reactor in 2018. uses multiperiod selection of inverse beta decay interactions with reduced backgrounds and enhanced statistical power set limits on electron caused by mixing sterile...
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...
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,...
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...
This paper presents an energy calibration scheme for upgraded reactor antineutrino detector the Precision Reactor Oscillation and Spectrum Experiment (PROSPECT). The PROSPECT collaboration is preparing detector, PROSPECT-II (P-II), to advance capabilities investigation of fundamental neutrino physics, fission processes associated flux, nuclear security applications. P-II will expand statistical power original (P-I) dataset by at least order magnitude. new design builds upon previous P-I...