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

The reaction ¹⁰B(γ,p) has been studied using tagged photons of mean energies Eγ=57.6 and 72.9 MeV. Angular distributions and derived single-particle momentum distributions for protons leading to the ground state of ⁹Be and higher excited states are compared to various calculations made using model parameters constrained by ¹⁰B(e,e′p)⁹Be and ⁹Be(p,p′)⁹Be 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 ¹⁰B(γ,p0)⁹Be data is found.