Abstract
We propose a semi-classical model to study the characteristics of the observed hard-photon production in heavy-ion collisions. For this we divide the nucleons in two categories on a geometrical basis: participant nucleons in the overlapping region which can suffer two-body collisions thus producing photons through n-p bremsstrahlung and spectator nucleons. We investigate the relative importance of the gain and loss term of the Uehling-Uhlenbeck collision integral. The elementary pn→pnγ process is included for two different prescriptions: i) classical soft limit, ii) quantum calculation including meson exchange. We also study the influence of the Δ-resonance in hard-photon production. We show that for heavy colliding nuclei and high beam energies a bump should be visible.
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