Eric Jensen
A5083213854- Atmospheric Ozone and Climate
- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Nuclear physics research studies
- Atmospheric and Environmental Gas Dynamics
- Atomic and Subatomic Physics Research
- Advanced NMR Techniques and Applications
- Demographic Trends and Gender Preferences
- Nuclear Physics and Applications
- High-Energy Particle Collisions Research
- Global Maternal and Child Health
- Icing and De-icing Technologies
- Dark Matter and Cosmic Phenomena
- Quantum, superfluid, helium dynamics
- X-ray Spectroscopy and Fluorescence Analysis
- Radiation Detection and Scintillator Technologies
- Advanced Chemical Physics Studies
- Orthopedic Surgery and Rehabilitation
- Aerospace Engineering and Energy Systems
- Electron and X-Ray Spectroscopy Techniques
- Medical Imaging Techniques and Applications
- Spacecraft and Cryogenic Technologies
- nanoparticles nucleation surface interactions
Cooperative Institute for Research in Environmental Sciences
2024
Aarhus University
2021-2024
Christopher Newport University
2010-2022
NSF National Center for Atmospheric Research
2019-2021
Atmospheric Chemistry Observations & Modeling
2020
Thomas Jefferson National Accelerator Facility
2018-2019
University of Ljubljana
2018
William & Mary
1985-2012
Williams (United States)
1986-2012
University of Virginia
2012
We report the first measurement of parity-violating asymmetry APV in elastic scattering polarized electrons from Pb208. is sensitive to radius neutron distribution (Rn). The result APV=0.656±0.060(stat)±0.014(syst) ppm corresponds a difference between radii and proton distributions Rn−Rp=0.33−0.18+0.16 fm provides electroweak observation skin which expected heavy, neutron-rich nucleus.Received 12 January 2012DOI:https://doi.org/10.1103/PhysRevLett.108.112502© 2012 American Physical Society
We present a search at the Jefferson Laboratory for new forces mediated by sub-GeV vector bosons with weak coupling ${\ensuremath{\alpha}}^{\ensuremath{'}}$ to electrons. Such particle ${A}^{\ensuremath{'}}$ can be produced in electron-nucleus fixed-target scattering and then decay an ${e}^{+}{e}^{\ensuremath{-}}$ pair, producing narrow resonance QED trident spectrum. Using APEX test run data, we searched mass range 175--250 MeV, found no evidence...
Among the most fundamental observables of nucleon structure, electromagnetic form factors are a crucial benchmark for modern calculations describing strong interaction dynamics nucleon's quark constituents; indeed, recent proton data have attracted intense theoretical interest. In this Letter, we report new measurements factor ratio using recoil polarization method, at momentum transfers Q2=5.2, 6.7, and 8.5 GeV2. By extending range Q2 which G(E)(p) is accurately determined by more than 50%,...
Abstract. This study presents airborne in situ and satellite remote sensing climatologies of cirrus clouds humidity. The serve as a guide to the properties clouds, with new database providing detailed insights into boreal midlatitudes tropics, while satellite-borne data set offers global overview. To this end, an extensive, quality-checked archive, Cirrus Guide II database, is created from measurements during 150 flights 24 campaigns. archive contains meteorological parameters, ice water...
It has been suggested that T cell immunoglobulin mucin (Tim)-1 expressed on cells serves to positively costimulate responses. However, crosslinking of Tim-1 by its ligand Tim-4 resulted in either activation or inhibition responses, thus raising the issue whether can have a dual function as costimulator. To resolve this issue, we tested series monoclonal antibodies specific for and identified two showed opposite functional effects. One anti–Tim-1 antibody increased frequency antigen-specific...
Intensive theoretical and experimental efforts over the past decade have aimed at explaining discrepancy between data for proton electric to magnetic form factor ratio, G(E)/G(M), obtained separately from cross section polarization transfer measurements. One possible explanation this difference is a two-photon-exchange contribution. In an effort search effects beyond one-photon-exchange or Born approximation, we report measurements of observables in elastic H(e[over →],e(')p[over →])...
The GEp-III and GEp-2$\gamma$ experiments were carried out in Jefferson Lab's (JLab's) Hall C from 2007-2008, to extend the knowledge of $G_E^p/G_M^p$ highest practically achievable $Q^2$ search for effects beyond Born approximation polarization transfer observables elastic $\vec{e}p$ scattering. This article reports an expanded description common experimental apparatus data analysis procedure, results a final reanalysis both experiments, including previously unpublished full-acceptance...
We have measured the beam-normal single-spin asymmetry $A_n$ in elastic scattering of 1-3 GeV transversely polarized electrons from $^1$H and for first time $^4$He, $^{12}$C, $^{208}$Pb. For $^1$H, $^4$He measurements are agreement with calculations that relate to imaginary part two-photon exchange amplitude including inelastic intermediate states. Surprisingly, $^{208}$Pb result is significantly smaller than corresponding prediction using same formalism. These results suggest a systematic...
Beta-delayed proton emission in the lower half of sd-shell will involve deformed nuclei. We derive normalized matrix element connecting one particle from an initial rotational nuclear state to another final rotating state, and we extract selection rules involving $K$ quantum number. The is approximated as having a core identical state. formalism then directly applicable $\beta^+$-delayed decays even-$Z$, odd-$N$ nuclei or $\beta^-$-delayed neutron odd-$Z$, even $N$ These beta-decay results...
In the pursuit of identifying rare two-particle events within GADGET II Time Projection Chamber (TPC), this paper presents a comprehensive approach for leveraging Convolutional Neural Networks (CNNs) and various data processing methods. To address inherent complexities 3D TPC track reconstructions, is expressed in 2D projections 1D quantities. This capitalizes on diverse modalities TPC, allowing efficient representation distinct features events, with no loss topology uniqueness....
Measurements of ambient ice nucleating particle (INP) composition, concentration, and activation properties in the cirrus regime are extremely sparse. However, such measurements fundamental to advancing understanding extent sensitivities varied sources, as well impacts from perturbations natural and/or anthropogenic origin. Here we present a potential approach providing cirrus-relevant INP observations both fast-response systematic measurement scenarios. We will leverage experience with an...
Abstract Beta-delayed proton emission in the lower half of sd-shell will involve deformed nuclei. We derive normalized matrix element connecting one particle from an initial rotational nuclear state to another final rotating state, and we extract selection rules involving K quantum number. The is approximated as having a core identical state. formalism then directly applicable $$\beta ^+$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>β</mml:mi>...
We model the impact of past migration on fertility, assessing separate effects relative urbanization destination, as a proxy for norms, and post-migration employment, opportunity costs. In Philippines, we find that large fertility declines accompany employment. If not followed by work pay, estimated is small. little evidence migrant selectivity in offer speculative disruption accompanying may be enough to account much apparent effect normative adaptation.
We report the first measurement of target single-spin asymmetry, A(y), in quasielastic scattering from inclusive reaction (3)He(↑)(e,e') on a (3)He gas polarized normal to lepton plane. Assuming time-reversal invariance, this asymmetry is strictly zero for one-photon exchange. A nonzero A(y) can arise interference between one- and two-photon exchange processes which sensitive details substructure nucleon. An experiment recently completed at Jefferson Lab yielded asymmetries with high...
Abstract. This study presents airborne in-situ and satellite remote sensing climatologies of cirrus clouds humidity. The serve as a guide to the properties clouds, with new data base providing detailed insights into boreal mid-latitudes tropics, while satellite-borne set offers global overview. To this end, an extensive, quality checked archive, Cirrus Guide II base, is created from measurements during 150 flights in 24 campaigns. archive contains meteorological parameters, IWC, Nice, Rice,...
The excited levels of $^{122}\mathrm{Te}$ to $3.3\ensuremath{-}\phantom{\rule{0.3em}{0ex}}\text{MeV}$ excitation have been studied using $\ensuremath{\gamma}$-ray spectroscopy following inelastic neutron scattering. decay characteristics these determined from functions, angular distributions at ${E}_{n}\ensuremath{-}1.72,2.80$, and $3.35\phantom{\rule{0.3em}{0ex}}\text{MeV}$, Doppler shifts, $\ensuremath{\gamma}\ensuremath{\gamma}$ coincidences. Electromagnetic transition rates were deduced...
We present a precise measurement of double-polarization asymmetries in the ^{3}He[over →](e[over →],e^{'}d) reaction. This particular process is uniquely sensitive probe hadron dynamics ^{3}He and structure underlying electromagnetic currents. The measurements have been performed around quasielastic kinematics at Q^{2}=0.25(GeV/c)^{2} for missing momenta up to 270 MeV/c. are fair agreement with state-of-the-art calculations terms their functional dependencies on p_{m} ω, but systematically...
We present new data for the polarization observables of final state proton in (1)H(γ,p)π(0) reaction. These can be used to test predictions based on hadron helicity conservation and perturbative QCD. have both small statistical systematic uncertainties were obtained with beam energies between 1.8 5.6 GeV π(0) scattering angles larger than 75° center-of-mass frame. The extend measurements database neutral pion photoproduction up E(γ)=5.6 GeV. results show a nonzero induced above resonance...
Wide-angle exclusive Compton scattering and single-pion photoproduction from the proton have been investigated via measurement of polarization transfer a circularly polarized photon beam to recoil proton. The wide-angle was analyzed at an incident energy 3.7 GeV angle θ_{cm}^{p}=70°. longitudinal K_{LL}, measured be 0.645±0.059±0.048, where first error is statistical second systematic, has same sign as predicted for reaction mechanism in which interacts with single quark carrying spin...