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Physics  2003 

Meson photoproduction in the first and second resonance region

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The study of baryon resonances via meson photoproduction reactions on the free proton and on nucleons in the nuclear medium is discussed. Special emphasis is laid on the production of neutral mesons which due to the suppression of non-resonant backgrounds are particularly well suited for the study of excited states of the nucleon. Experiments carried out during the last ten years with the TAPS-detector at the Mainz Microtron (MAMI) have very significantly contributed to a detailed investigation of the low lying nucleon resonances P33(1232), D13(1520) and S11(1535). The most recent results from single and double pion production and from eta-photoproduction are summarised.


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