Electromagnetic form factors of the nucleon

الأصل · EN

Elastic form factors provide information about the low energy structure of composite particles.Recent double polarization coincidence experiments significantly improved our knowledge of proton and neutron form factors. Recoil polarization measurements in the p(e, e' p) reaction proved that at momentum transfers above Q² ≃ 1.5 (GeV/c)² the electric form factor of the proton falls significantly faster than the dipole expectation. The close--to--dipole shape at low Q² of the neutron magnetic form factor is now confirmed by independent measurements. For the neutron electric form factor ³He(e,e'n), D(e,e'n) and D (e,e' n) double polarization experiments have provided model independent results, within their statistical errors in agreement with the Galster parameterization.