A5108056983- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Diamond and Carbon-based Materials Research
- Particle Detector Development and Performance
- High-Energy Particle Collisions Research
- Atomic and Subatomic Physics Research
- Radiation Detection and Scintillator Technologies
- Religious Studies and Spiritual Practices
- Medical Imaging Techniques and Applications
- Energetic Materials and Combustion
- High-pressure geophysics and materials
- Rocket and propulsion systems research
- Nuclear physics research studies
- Muon and positron interactions and applications
- American Constitutional Law and Politics
- Noncommutative and Quantum Gravity Theories
- Sensor Technology and Measurement Systems
- Particle Accelerators and Free-Electron Lasers
- Intermetallics and Advanced Alloy Properties
- Planetary Science and Exploration
- Experimental Learning in Engineering
- Historical Art and Culture Studies
Illinois Institute of Technology
2015-2024
University of Hawaiʻi at Mānoa
2023
University of Hassan II Casablanca
2022
Institut de Physique
2022
University of California, Berkeley
2022
Université Paris Cité
2008-2022
Centre National de la Recherche Scientifique
2022
Laboratoire de Physique Nucléaire et de Hautes Énergies
2022
Yale University
2022
Institut National de Physique Nucléaire et de Physique des Particules
2022
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 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...
We report the first evidence for decay Σ+→pμ+μ− from data taken by HyperCP (E871) experiment at Fermilab. Based on three observed events, branching ratio is B(Σ+→pμ+μ−)=[8.6−5.4+6.6(stat)±5.5(syst)]×10−8. The narrow range of dimuon masses may indicate that proceeds via a neutral intermediate state, Σ+→pP0,P0→μ+μ− with P0 mass 214.3±0.5 MeV/c2 and B(Σ+→pP0,P0→μ+μ−)=[3.1−1.9+2.4(stat)±1.5(syst)]×10−8.Received 3 November 2004DOI:https://doi.org/10.1103/PhysRevLett.94.021801©2005 American...
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,...
Angular correlation of gamma rays from two-quantum positron annihilation has been investigated in seven metals: zinc, cadmium, indium, lead, tin, aluminum, and bismuth, over a range temperatures –150 °C up to their melting points. The distributions for bismuth show no more than the small variation with temperature expected because change lattice volume. Zinc, indium display large increase proportion annihilations occurring valence electrons at higher temperatures. This observation evidence...
We report a study of 20 exclusive reactions measured at the AGS 5.9 GeV/c incident momentum, 90\ifmmode^\circ\else\textdegree\fi{} center mass. This experiment confirms strong quark flow dependence two-body hadron-hadron scattering large angle. At 9.9 an upper limit had been set for ratio cross sections $\frac{(\overline{p}p\ensuremath{\rightarrow}\overline{p}p)}{(pp\ensuremath{\rightarrow}pp)}$ c.m., with less than 4%. The present was performed lower energy to gain sensitivity, but still...
Electrical characteristics associated with radiation detection were measured on single-crystal natural type-IIa diamond using two techniques: charged particle-induced conductivity and time-resolved transient photoinduced conductivity. The techniques complement each other: technique measures the product of carrier mobility μ lifetime τ throughout bulk material while photoconductivity independently at first few micrometers surface. For technique, μτ was determined by integration respective...
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...
We measured simultaneously $\mathrm{pp}$ elastic and quasielastic $(p,2p)$ scattering in hydrogen, deuterium, carbon for momentum transfers of 4.8 to $6.2(\mathrm{GeV}/c{)}^{2}$ at incoming momenta 5.9 $7.5\mathrm{GeV}/c$ center-of-mass angles the range ${\ensuremath{\theta}}_{\mathrm{c}.\mathrm{m}.}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}83.7\ifmmode^\circ\else\textdegree\fi{}--90\ifmmode^\circ\else\textdegree\fi{}$. The nuclear transparency is defined as ratio cross section free...
We summarize the results of two experimental programs at Alternating Gradient Synchrotron BNL to measure nuclear transparency nuclei measured in $A(p,2p)$ quasielastic scattering process near ${90}^{\ifmmode^\circ\else\textdegree\fi{}}$ $pp$ center mass. The incident momenta varied from 5.9 $14.4\phantom{\rule{0.3em}{0ex}}\mathrm{GeV}∕c$, corresponding $4.8<{Q}^{2}<12.7\phantom{\rule{0.3em}{0ex}}{(\mathrm{GeV}∕c)}^{2}$. Taking into account motion target proton nucleus, effective extended 5.0...
We have searched for ${\ensuremath{\theta}}^{+}(1.54)\ensuremath{\rightarrow}{K}^{0}p$ decays using data from the 1999 run of HyperCP experiment at Fermilab. see no evidence a narrow peak in ${K}_{S}^{0}p$ mass distribution near $1.54\text{ }\text{ }\mathrm{G}\mathrm{e}\mathrm{V}/c$ among 106 000 candidates, and obtain an upper limit fraction ${\ensuremath{\theta}}^{+}(1.54)$ to candidates $<0.3%$ 90% confidence.
Based on a sample of 144×106 polarized Ξ−→Λπ−,Λ→pπ− decays collected by the HyperCP experiment (E871) at Fermilab, we report new measurement Ξ− decay-parameter angle φΞ=(−2.39±0.64±0.64)° from which deduce decay parameters βΞ=−0.037±0.011±0.010 and γΞ=0.888±0.0004±0.006. Assuming that CP-violating phase difference between s p waves is negligible, strong phase-shift difference, δp−δs, for Λπ scattering determined to be (4.6±1.4±1.2)°.Received 13 February...
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...