A Microscopic Calculation of Photoabsorption Cross Sections on Protons and Nuclei

Details A Microscopic Calculation of Photoabsorption Cross Sections on Protons and Nuclei A Microscopic Calculation of Photoabsorption Cross Sections on Protons and Nuclei

1997-09-05

arxiv.org/abs/nucl-th/9709008v1

Phys.Lett.B417:1-6,1998

Physics

Nuclear Physics

Nuclear Theory

10 pages RevTeX, 2 eps-figures

Scientific paper

10.1016/S0370-2693(97)01360-9

A recently developed model for $\rho$-meson propagation in dense hadronic matter is applied to total photoabsorption cross sections in $\gamma$-proton and $\gamma$-nucleus reactions. Within the vector dominance model the photon coupling to the virtual pion cloud of the nucleon, two-body meson-exchange currents, as well as $\gamma$-nucleon resonances are included. Whereas the $\gamma p$ reaction is determined by the low-density limit of the model, higher orders in the nuclear density are important to correctly account for the experimental spectra observed on both light and heavy nuclei over a wide range of photon energies, including the region below the pion threshold. In connection with soft dilepton spectra in high-energy heavy-ion collisions we emphasize the importance of photoabsorption to further constrain the parameters of the model.

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