Investigation of inclusive proton photoproduction by bremsstrahlung gamma quanta with maximum energy 2.0-4.5 GeV

The Asup(n) dependence and the momentum spectra of photoprotons are measured in experiments on the 12C, 27Al, 63Cu, 118An, 208Pb nuclei at maximum energies of the bremsstrahlung γ quanta 2.0, 3.0, and 4.5 GeV. The A dependence suggests that the photoproduction mechanism is identical in the whole investigated region of the energies kinetic 65-280 MeV and 45 deg - 150 deg angles of the secondary protons. Dependence of the exponent n on the transversal momentum psub(tr) is in reasonable agreement with that for protons produced by incident protons on nuclei. In momentum spectra of the invariant cross section f approximately exp(-Bp2) it is found that the parameter B does not depend on the incident photon energy and on the target nucleus, but does depend on the proton emission angle