Proton polarization in the
reaction and the
measurement of quadrupole components in the N to
transition
H. Schmieden
Institut für Kernphysik der Johannes Gutenberg-Universität, 55099 Mainz, Germany
Received: 3 November 1997 Communicated by B. Povh
Abstract
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.
PACS
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
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