Baryon resonances of the proton and few-body systems in the 200–800 MeV energy range
The total photoabsorption cross sections for 1H, 2H, 3He, and 4H have been measured (for the first time for 3He) with high precision on the MAMI-B accelerator (Mainz, Germany) with a tagged photon beam and the large acceptance detector DAPHNE. The dynamics of baryon resonances along the periodic table is analyzed, and they are compared with the sum of partial reactions on proton and deuteron. Preparation and the first stage of polarization measurements of photoabsorption cross sections on proton in the Δ resonance region are reported.