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HK: Hadronen und Kerne

HK 61: Electromagnetic Probes VIII, Properties of Nucleon, Pion

HK 61.2: Gruppenbericht

Donnerstag, 19. März 1998, 14:30–15:00, B

Q²-Dependence of the Coulomb Quadrupole Contribution to the N→Δ Transition — •Dirk Wacker¹, B. Bantes¹, R. Bantes¹, H. Brunhöber¹, R.W. Gothe¹, H. Hainer¹, D. Jakob¹, P. Maschke¹, J. Langheinrich¹, B. Schoch¹, and H. Willering² — ¹Physikalisches Institut der Universität Bonn, Nußallee 12, 53115 Bonn — ²Dept. of Subatomic Physics, Utrecht University, 3508 TA Utrecht, The Netherlands

Pion electroproduction experiments on ¹H and ²D in the region of the Δ(1232) resonance have been carried out in a Q²-range of (0.04 − 0.8) GeV² at the electron stretcher accelerator ELSA. The decay particles of the Δ have been detected with a nonmagnetic time-of-flight spectrometer. It comprises of four scintillation walls each with the dimensions 3 * 3 m² and is therefore capable to accept large solid angles. Out of the gained Θ and Φ angular distributions of the final state particles informations about the strength of different multipoles contributing to the cross section can be extracted. Especially the Coulomb quadrupole contribution (S₁₊ or L₁₊) to the N→Δ transition will be determined by the ratio Re(S₁₊^*M₁₊)/|M₁₊|². First results for the reaction p(e,e′p)π⁰ extracted on top of the resonance where the nonresonant background is minimal will be presented.