Proton polarization in the p(e,e′p)π0 reaction and the measurement of quadrupole components in the N to Δ transition |
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Authors: | H. Schmieden |
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Affiliation: | Institut für Kernphysik der Johannes Gutenberg-Universit?t, 55099 Mainz, Germany, DE
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Abstract: | The recoil proton polarization in the π0 production off the proton with longitudinally polarized electron beam has been studied as a means to measure quadrupole components in the N to Δ transition. On top of the Δ resonance a high sensitivity to a possible Coulomb quadrupole excitation is found in parallel kinematics. The ratio of S 1+/M 1+ 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. Received: 3 November 1997 |
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Keywords: | 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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