Abstract
Medium energy (γ, p 0) reactions are investigated with the purpose of finding how far a direct knockout mechanism holds. Final state interactions are included in a cross section where the hole spectral function is not factorized. The approximate factorized formula gives large differences (a priori out of control). The choice of different optical model potentials and bound state wave functions is discussed and results are compared with experimental data for 12C, 16O and 40Ca. The sensitivity to the optical potential is confirmed. The direct mechanism appears able to reproduce the experimental cross sections up to photon energies corresponding to a recoil momentum larger than 2 fm −1.
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