9 research outputs found
The Measurement of the Asymmetry of Tensor-Polarized Deuteron Electrodisintegration at 180 MeV Electron Energy
The nucleon emission asymmetry in d(e, pn)e' reaction was measured using the tensor-polarized deuterium jet target in the VEPP-2 electron storage ring. At the present experimental accuracy, the results for the proton energy interval Ep= 12-100 MeV do not contradict the nonrelativistic calculations.
Precision Measurement of the p(e,e ' p)pi(0) Reaction at Threshold
New results are reported from a measurement of electroproduction near
threshold using the reaction. The experiment was
designed to determine precisely the energy dependence of and wave
electromagnetic multipoles as a stringent test of the predictions of Chiral
Perturbation Theory (ChPT). The data were taken with an electron beam energy of
1192 MeV using a two-spectrometer setup in Hall A at Jefferson Lab. For the
first time, complete coverage of the and angles
in the center-of-mass was obtained for invariant energies above
threshold from 0.5 MeV up to 15 MeV. The 4-momentum transfer coverage
ranges from 0.05 to 0.155 (GeV/c) in fine steps. A simple phenomenological
analysis of our data shows strong disagreement with wave predictions from
ChPT for (GeV/c), while the wave predictions are in
reasonable agreement.Comment: 5 pages, 6 figure
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Tests of a polarized source of hydrogen and deuterium based on spin-exchange optical pumping and a storage cell for polarized deuterium
A novel laser-driven polarized source of hydrogen and deuterium which is based on the principle of spin-exchange optical pumping has been developed at Argonne. The advantages of this method over conventional polarized sources for internal target experiments is discussed. At present, the laser-driven polarized source delivers hydrogen 8 x 10 W atoms/s with a polarization of 24% and deuterium at 6 x 10 W atoms/s with a polarization of 25%. A passive storage cell for polarized deuterium was tested in the VEPP-3 electron storage ring. The storage cell was found to increase the target thickness by approximately a factor of three and no loss in polarization was observed. 10 refs., 4 figs., 2 tabs
Two-photon exchange contribution in elastic electron-proton scattering, experiment at the VEPP-3 storage ring
We describe a precise measurement of the ratio of the (e+ p) to (eâ p) elastic scattering cross sections. This comparison is sensitive to the effect of two-photon exchange contributions which may be the cause for inconsistent extractions of the proton form factors obtained using different methods. The experiment was performed at storage ring VEPPâ3, Novosibirsk at energies of positron/electron beams of 1.0 and 1.6 GeV with electron/positron scattering angles Ξ = 65Ă·105° for the first case and 15Ă·25° and 55Ă·75° for the second case. Details of the experiment and the preliminary results are presented
Two-photon exchange contribution in elastic electron-proton scattering, experiment at the VEPP-3 storage ring
We describe a precise measurement of the ratio of the (e+ p) to (eâ p) elastic scattering cross sections. This comparison is sensitive to the effect of two-photon exchange contributions which may be the cause for inconsistent extractions of the proton form factors obtained using different methods. The experiment was performed at storage ring VEPPâ3, Novosibirsk at energies of positron/electron beams of 1.0 and 1.6 GeV with electron/positron scattering angles Ξ = 65Ă·105° for the first case and 15Ă·25° and 55Ă·75° for the second case. Details of the experiment and the preliminary results are presented