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HK: Physik der Hadronen und Kerne
HK 11: Poster Session: Electromagnetic and Hadronic Probes
HK 11.28: Poster
Tuesday, March 9, 2004, 13:30–15:30, Foyer
η and η′ photoproduction on deuteron — •Igal Jaeglé — Universität Basel, CH-4056 Basel, Klingelbergst. 82
The photoproduction of η and η′ mesons on the deuteron has been measured at the tagged photon beam of the Bonn ELSA accelerator with a combined setup of the Crystal Ball and TAPS detectors, which formed a 4π electromagnetic calorimeter. The mesons were detected in coincidence with the (participant) recoil nucleons, so that the reactions on the proton and on the neutron can be compared. For η - mesons previous experiments have determined a neutron - proton cross section ratio of 2 / 3 in the excitation energy range of the S11(1535). Models predict a strong rise of the ratio at higher energies due to the contribution from other resonances. Angular distributions and photon beam asymetries will be analysed in view of these effects. The measurement of η′ production is the first attempt to study this reaction on the neutron. It aims furthermore at an investigation of the threshold behaviour (η′ nucleon - interaction) on the deuteron. First preliminary results will be discussed.