Abstract
With a tunable electron energy of up to 3.5 GeV the Electron Stretcher Accelerator ELSA at the University of Bonn covers the domain of nucleon resonances and exceeds the thresholds of the lowest lying nonets of pseudoscalar and vector mesons. ELSA delivers a beam current of I = 80 nA in the stretcher mode and up to I = 20 nA in the postaccelerator mode. The duty factor of up to 90 % allows to perform coincidence experiments in electron scattering and photoproduction with tagged photon beams. The electron scattering facility ELAN had been used to study elastic and transition form factors for the proton as well as for the neutron. Results on the deformation of N Δ are reported elsewhere in these proceedings ([1]). This experiment position is now used by a set-up for the measurement of the Gerasimov-Drell-Hearn sumrule. The work at SAPHIR focussed on the production of associated strangeness in KΛ, KΣ as well as vectormeson-production and nucleon resonances. In its place the Crystal Barrel detector with its excellent capability for the detection and spectroscopy of photonic final states has been set up and is presently in the commissioning phase. The main characteristics of these experiments, their aims and results are described on the following pages.
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