J. Napolitano
A5077633047- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Neutrino Physics Research
- High-Energy Particle Collisions Research
- Astrophysics and Cosmic Phenomena
- Nuclear physics research studies
- Atomic and Subatomic Physics Research
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Atomic and Molecular Physics
- Advanced NMR Techniques and Applications
- Medical Imaging Techniques and Applications
- Particle accelerators and beam dynamics
- X-ray Spectroscopy and Fluorescence Analysis
- Computational Physics and Python Applications
- Superconducting Materials and Applications
- Photocathodes and Microchannel Plates
- Quantum, superfluid, helium dynamics
- Electron and X-Ray Spectroscopy Techniques
- Radioactive Decay and Measurement Techniques
- Chemical Synthesis and Analysis
- Electron Spin Resonance Studies
- Cosmology and Gravitation Theories
Temple University
2014-2024
Temple College
2024
University of Wisconsin–Madison
2019
Wagner College
2019
Rensselaer Polytechnic Institute
2002-2018
Institute of High Energy Physics
2015
Nanjing University
2014
Florida State University
2006
Campbell Collaboration
2004
Argonne National Laboratory
1983-1994
We report a precision measurement of the parity-violating asymmetry $A_{PV}$ in elastic scattering longitudinally polarized electrons from $^{208}$Pb. measure $A_{PV}=550\pm 16 {\rm (stat)}\pm 8\ (syst)}$ parts per billion, leading to an extraction neutral weak form factor $F_W(Q^2 = 0.00616\ GeV}^2) 0.368 \pm 0.013$. Combined with our previous measurement, extracted neutron skin thickness is $R_n-R_p=0.283 0.071$~fm. The result also yields first significant direct interior density...
We report a precise measurement of the parity-violating (PV) asymmetry A_{PV} in elastic scattering longitudinally polarized electrons from ^{48}Ca. measure A_{PV}=2668±106(stat)±40(syst) parts per billion, leading to an extraction neutral weak form factor F_{W}(q=0.8733 fm^{-1})=0.1304±0.0052(stat)±0.0020(syst) and charge minus F_{ch}-F_{W}=0.0277±0.0055. The resulting neutron skin thickness R_{n}-R_{p}=0.121±0.026(exp)±0.024(model) fm is relatively thin yet consistent with many model...
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.
The cross section for quasielastic $^{12}\mathrm{C}$(e,e'p) scattering has been measured at momentum transfer ${\mathit{Q}}^{2}$=1, 3, 5, and 6.8 (GeV/c${)}^{2}$. results are consistent with from a single nucleon as the dominant process. nuclear transparency is obtained compared theoretical calculations that incorporate color effects. No significant rise of ${\mathit{Q}}^{2}$ observed.
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,...
The first measurements of the differential cross section for d(gamma,p)n reaction up to 4.0 GeV were performed at Continuous Electron Beam Accelerator Facility (CEBAF) Jefferson Lab. We report sections proton center-of-mass angles 36, 52, 69 and 89 degrees. These results are in reasonable agreement with previous lower energy. degree data show constituent-counting-rule behavior photon 36 52 disagree counting rule behavior. quantum chromodynamics (QCD) model nuclear reactions involving reduced...
We have measured the differential cross section for two-body deuteron photodisintegration at ${\ensuremath{\theta}}_{\mathrm{c}.\mathrm{m}.}=90\ifmmode^\circ\else\textdegree\fi{}$ and photon energies between 0.8 1.6 GeV. At above \ensuremath{\simeq} 1.2 GeV, data appear to obey a simple scaling law predicted by constituent-counting rules assuming parton degrees of freedom nucleons. Agreement with model calculations based on meson exchange or "reduced nuclear amplitudes" is discussed.
We report precision determinations of the beam-normal single spin asymmetries (A_{n}) in elastic scattering 0.95 and 2.18 GeV electrons off ^{12}C, ^{40}Ca, ^{48}Ca, ^{208}Pb at very forward angles where most detailed theoretical calculations have been performed. The first measurements A_{n} for ^{40}Ca ^{48}Ca are found to be similar that consistent with expectations thus demonstrating validity nuclei Z≤20. also two new momentum transfers (Q^{2}) extending previous measurement. Our data...
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...
Measurements were performed for the photodisintegration cross section of deuteron photon energies from 1.6 to 2.8 GeV and center-of-mass angles 37\ifmmode^\circ\else\textdegree\fi{} 90\ifmmode^\circ\else\textdegree\fi{}. The measured energy dependence at ${\ensuremath{\theta}}_{\mathrm{c}.\mathrm{m}.}=90\ifmmode^\circ\else\textdegree\fi{}$ is in agreement with constituent counting rules.
The possibility that a scalar boson is sometimes emitted in the decay of $^{4}\mathrm{He}$(20.1 MeV, ${0}^{+}$) examined experimentally. Finding no positive evidence authors exclude scalars with Higgs-like couplings for $3\ensuremath{\lesssim}{m}_{\ensuremath{\phi}}\ensuremath{\lesssim}14$ MeV/${\mathit{c}}^{2}$, where precise range depends upon model.
Structure functions, as measured in lepton-nucleon scattering, have proven to be very useful studying the quark dynamics within nucleon. However, it is experimentally difficult separately determine longitudinal and transverse structure consequently there are substantially less data available for function particular. Here we present separated functions hydrogen deuterium at low four--momentum transfer squared, Q^2< 1 GeV^2, compare these with parton distribution parameterizations a k_T...
The differential cross section for the reaction H2(γ,p)n has been measured at several center-of-mass angles ranging from 50° to 143° photon energies between 0.8 and 1.8 GeV. experiment was performed SLAC-NPAS facility with use of 1.6 GeV/c spectrometer detect high energy protons produced by a bremsstrahlung beam directed liquid deuterium target. Contributions concurrent disintegration residual electron were determined measuring proton yield without Cu radiator. At not very far 90°,...
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.
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,...
Cross sections are presented for the reaction 2H(e,e′p)n momentum transfers in range 1.2≤Q2≤6.8(GeV/c)2 and missing momenta from 0 to 250 MeV/c. The longitudinal-transverse interference structure function has been separated at Q2=1.2(GeV/c)2. observables compared calculations performed nonrelativistic relativistic frameworks. data best described by a fully calculation.Received 4 November 1994DOI:https://doi.org/10.1103/PhysRevLett.74.4775©1995 American Physical Society
A 20-ton neutrino detector located near the Los Alamos Meson Physics Facility beam stop is used search for ${\overline{\ensuremath{\nu}}}_{e}$ generated via oscillations from any of three types, ${\ensuremath{\nu}}_{\ensuremath{\mu}}$, ${\overline{\ensuremath{\nu}}}_{\ensuremath{\mu}}$, and ${\ensuremath{\nu}}_{e}$, which radiate stop. The analysis years data provides limits on oscillation modes...
The number of pseudoscalar mesons in the mass range from 1400 to 1500 MeV/c2 has been a subject considerable interest for many years, with several experiments having presented evidence two closely spaced states. A new measurement reaction π−p→K+K−π0n made at beam energy 18 GeV. partial wave analysis K+K−π0 system shows three resonances, η(1295), η(1416), and η(1485), as well axial vectors, f1(1285), f1(1420). Their observed masses, widths decay properties are reported. No signal was C(1480),...