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.
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Received: 3 November 1997
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Schmieden, H. Proton polarization in the p(e,e′p)π0 reaction and the measurement of quadrupole components in the N to Δ transition . EPJ A 1, 427–433 (1998). https://doi.org/10.1007/s100500050077
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DOI: https://doi.org/10.1007/s100500050077