Proton polarization in the reaction and the measurement of quadrupole components in the N to transition
Institut für Kernphysik der Johannes Gutenberg-Universität, 55099 Mainz, Germany
Received: 3 November 1997 Communicated by B. Povh
The recoil proton polarization in the production off the proton with longitudinally polarized electron beam has been studied as a means to measure quadrupole components in the N to transition. On top of the resonance a high sensitivity to a possible Coulomb quadrupole excitation is found in parallel kinematics. The ratio of S1+/M1+ multipole amplitudes can be determined from the ratio of the two in-scattering-plane recoil proton polarization components. Avoiding the absolute measurement of the polarizations, such a ratio allows small experimental uncertainties. Furthermore, the electron helicity independent proton polarization component enables the characterization of resonant and non-resonant pieces.
14.20.Gk Baryon resonances with S=0 - 13.60.Rj Baryon productions - 13.60.Le Meson production - 13.40.-f Electromagnetic processes and properties - 13.60.-r Photon and charged-lepton interactions with hadrons