Investigation of the 10B(γ,p) reaction using tagged photons

The reaction B-10(gamma,p) has been studied using tagged photons of mean energies E-gamma = 57.6 and 72.9 MeV. Angular distributions and derived single-particle momentum distributions for protons leading to the ground state of Be-9 and higher excited states are compared to various calculations made using model parameters constrained by B-10(e,e' p)Be-9 and Be-9(p,p')Be-9 measurements. The effects of varying final-state interactions (including channel couplings) and meson exchange currents are considered. A sizable discrepancy between direct-knockout calculations and the experimental results is observed. If meson exchange currents are included in an approximate fashion, a good description of the B-10(gamma,p(0))Be-9 data is found.