Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 69: Hadron Structure and Spectroscopy I

HK 69.3: Talk

Thursday, March 19, 2009, 17:30–17:45, H-ZO 20

Coherent photoproduction of multiple mesons off the deuteron — •Igal Jaegle — Department of Physics, University of Basel

The coherent photoproduction of ηπ^o-pairs, ωπ^o-pairs, π^oπ^oπ^o-triplets and ηπ^oπ^o-triplets have been measured for the first time at a tagged photon beam of the Bonn ELSA electron accelerator with the combined Crystal Barrel - TAPS electromagnetic calorimeter for incident photon energies up to 2.5 GeV. A clear identification of the coherent signal is possible by detecting the mesons in coincidence with the recoil deuterons. This coherent productions may lead to novel approaches for the search of mesic nuclei. For example, in the reaction γ d → ηπ^od, the η-mesons are emitted with very small kinetic energies, so that it can be used as a tool to study the much discussed η-nucleon, η-deuteron interaction at small relative momenta. Furthermore, the inclusive measurement (i.e. without detecting the recoil deuterons) of the coherent photoproduction of multiple mesons is also possible. This development might open a new possibility for the observation of in medium effects in heavy nuclei. Funded by the Swiss National Fund and the DFG (TR16).