Shadowing in the nuclear photoabsorption above the resonance region

Details Shadowing in the nuclear photoabsorption above the resonance region Shadowing in the nuclear photoabsorption above the resonance region

1999-04-13

arxiv.org/abs/nucl-th/9904033v1

Phys.Rev. C60 (1999) 064617

Physics

Nuclear Physics

Nuclear Theory

8 pages, 7 figures

Scientific paper

10.1103/PhysRevC.60.064617

A model based on the hadronic fluctuations of the real photon is developed to describe the total photonucleon and photonuclear cross sections in the energy region above the nucleon resonances. The hadronic spectral function of the photon is derived including the finite width of vector-meson resonances and the quark-antiquark continuum. The shadowing effect is evaluated considering the effective interaction of the hadronic component with the bound nucleons within a Glauber-Gribov multiple scattering theory. The low energy onset of the shadowing effect is interpreted as a possible signature of a modification of the hadronic spectral function in the nuclear medium. A decrease of the $\rho$-meson mass in nuclei is suggested for a better explanation of the experimental data.

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