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A model based on the hadronic fluctuations of the real photon is developed todescribe the total photonucleon and photonuclear cross sections in the energyregion above the nucleon resonances. The hadronic spectral function of thephoton is derived including the finite width of vector-meson resonances and thequark-antiquark continuum. The shadowing effect is evaluated considering theeffective interaction of the hadronic component with the bound nucleons withina Glauber-Gribov multiple scattering theory. The low energy onset of theshadowing effect is interpreted as a possible signature of a modification ofthe hadronic spectral function in the nuclear medium. A decrease of the$\rho$-meson mass in nuclei is suggested for a better explanation of theexperimental data.Comment: 8 pages, 7 figure

Shadowing in nuclear photoabsorption above the resonance region