Future Experiments at MAMI with the Crystal Ball Detector

A new set of experiments on meson photoproduction up to E_γ = 1.5 GeV is being planned for MAMI-C. It extends to higher energies the program carried out at MAMI-B. The experimental apparatus consists of the Crystal Ball multiphoton spectrometer together with TAPS as a forward wall, a central tracker based on a cylindrical wire chamber, and a scintillator barrel. This configuration provides a geometrical acceptance approaching 4π sterad and has good energy and angular resolution for photons as well as good angular resolution for charged particles. The detector will be equipped with a frozen-spin polarized target filled with ¹ {ěc H} , or ² {ěc H} . The new experimental program will focus on the helicity dependence of partial channels for investigating the properties of baryon resonances. We are also considering the possibility of measurements using a polarized ³ {ěc He} target. It will substantially improve the quality of the existing neutron data.