First measurement of the electric form-factor of the neutron in the exclusive quasielastic scattering of polarized electrons from polarized He-3

1994
7 pages
Published in:
  • Phys.Lett.B 327 (1994) 201-207

Citations per year

19911999200720152023051015
Abstract: (Elsevier)
A first measurement of the asymmetry in quasielastic scattering of longitudinally polarized electrons from a polarized 3 He gas target in coincidence with the knocked out neutron is reported. This measurement was made feasible by the cw beam of the 855 MeV Mainz Microtron MAMI. It allows a determination of the electric formfactor of the neutron G E n independent of binding effects to first order. At Q 2 =0.31 ( GeV /c) 2 two asymmetries A ∥ ( S He ∥ q ) and A ⊥ ( S He ⊥ q ) have been measured giving A ∥ =(−7.40±0.73)% and A ⊥ =(0.89±0.30)% . The ratio A ⊥ / A ∥ is independent of the absolute value of the electron and target polarization and yields G E n =0.035±0.012±0.005.
  • n: form factor
  • form factor: n
  • form factor: electric
  • electric: form factor
  • electron nucleus: inelastic scattering
  • inelastic scattering: electron nucleus
  • electron: polarized beam
  • polarized beam: electron
  • helium: nuclide
  • helium: polarized target