Angular distributions for the 12C(γ,p)11B reaction

Absolute differential cross sections for the C-12(gamma p)B-11 reaction have been measured for low-lying regions of residual excitation energy in B-11. Cross sections with low systematic uncertainties are presented for proton detection angles ranging from 30 degrees to 150 degrees, measured with tagged photons of 25-75 MeV energy. The experimental results resolve the discrepancies between the older data sets, In addition, a reinterpretation of the low-lying states excited in B-11 is presented. It is concluded that HF-RPA calculations with essential contributions of meson exchange currents (MEC) provide a qualitative description of the angular distributions obtained for the negative parity states in the (gamma,p) reaction