Bochum 1998 – scientific programme
Parts | Days | Selection | Search | Downloads | Help
HK: Hadronen und Kerne
HK 61: Electromagnetic Probes VIII, Properties of Nucleon, Pion
HK 61.2: Group Report
Thursday, March 19, 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.