The CB-ELSA experiment

The Crystal Barrel detector used before at LEAR (CERN) has been modified an d installed at the electron stretcher accelerator (ELSA) in Bonn. It will b e used to study photo- and electro-production of neutral mesons. One of the major aims of this experiment is the search for missing baryon resonances and to achieve a better understanding of the baryon spectrum. First data fr om test runs at low energy (250 MeV > E-gamma < 800 MeV) show photoproducti on of pi (0) and of 2 pi (0)-pairs.