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HK: Fachverband Hadronen und Kerne

HK 24: Hadron Structure and Spectroscopy I

HK 24.3: Talk

Tuesday, March 17, 2009, 15:00–15:15, H-ZO 20

Topics in Meson Photoproduction with Crystal Ball/TAPS at MAMI — •Sven Schumann — Institut für Kernphysik, Johannes Gutenberg-Universität Mainz

Since June 2004 the Crystal Ball/TAPS detector setup at the Mainz Mikrotron (MAMI) is used for experiments with energy-tagged real photons on liquid H₂/D₂ and various solid targets. The photon beam is produced in the bremsstrahlung process by the Glasgow-Mainz tagging system. The Crystal Ball as a spherical segmented photon spectrometer (672 NaI(Tl) crystals) in combination with the TAPS detector as a forward wall provides a solid angle coverage of nearly 4π; additional inner detectors are used for particle identification and track reconstruction. The experimental programme includes topics like photoexcitation of nucleon resonances in π⁰ and η production, structure investigation of baryons (such as the Δ⁺(1232) magnetic dipole moment determination), rare meson decays (η, ω), a new measurement of the η mass and studies of nuclear mass distributions using coherent π⁰ production on nuclei. An overview of the various experiments and results from both the MAMI-B (883 MeV beam energy) and also the new MAMI-C (1,5 GeV beam energy, operational since 2006) runs will be presented.