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Quantum Hadrodynamics in mean field approximation describes the effectivenucleon-nucleus potential (about -50 MeV deep) as resulting from a strongrepulsive vector (about 400 MeV) and a strong attractive scalar (about -450MeV) contribution. This scalar-vector Lorentz structure implies a significantlowering of the threshold for $p\bar{p}$ photoproduction on a nucleus by about850 MeV as compared to the free case since charge conjugation reverses the signof the vector potential contribution in the equation of motion for the$\bar{p}$ states. It also implies a certain size of the photon induced$p\bar{p}$ pair creation cross section near threshold which is calculated for atarget nucleus $^{208}$Pb. We also indicate a measurable second signature ofthe $p\bar{p}$ photoproduction process by estimating the increased crosssection for emission of charged pions as a consequence of $\bar{p}$annihilation within the nucleus.Comment: 18 pages latex, 5 PS figure

Can one directly test the scalar-vector Lorentz structure of the nucleon- and antinucleon-nucleus potential?