The Quadrupole Amplitudes in the γ N arrow Δ Transition at Low Momentum Transfer

Details The Quadrupole Amplitudes in the γ N arrow Δ Transition at Low Momentum Transfer The Quadrupole Amplitudes in the γ N arrow Δ Transition at Low Momentum Transfer

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprc10004n&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

Small, but non-zero electric and Coulomb quadrupole amplitudes (E2 and C2) measure the deviation of nucleon from a spherical symmetry. The required high experimental accuracy have been measured in the H(e,e^'p)π^0 reaction at MIT-Bates laboratory using the Out-of-Plane detection system (OOPS). This unique detection system minimizes systematic errors by detecting out going reaction particles simultaneously with multiple spectrometers. The out-of-plane detection allows us to accurately observe the imaginary part of the transverse-longitudinal σ_ TL and transverse-transverse component σ_TT cross sections. A combination of the σT and σ_TT cross sections is sensitive to the E2 amplitude. Measurements of the σ_LT and σ_LT^' are particularly sensitive to C2 and non-resonant background amplitudes, respectively. The newly commissioned pulse stretcher ring greatly improved the precision of H(e,e^'π^+)n reaction channel. This channel distribute different sensitivity to the backgrounds and provides an isospin decomposition in combination with π^0 reaction channel. The measured cross sections will be compared to phenomenological and a dynamical model calculations and the results for the quadrupole amplitudes will be presented.

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