Abstract
The emission of high energy photons and neutral pions in heavy ion collisions at E/A≤150MeV/u is discussed. The bulk of the experimental data is found to be consistent with particle production in individual nucléon — nucléon collisions within the reaction zone. A sytematics of in-medium photon and π 0 — production probabilities is established. It is illustrated that a theoretical analysis of the experimental results provides information on the space — time history of nucleus — nucleus collisions. Future perspectives of hard photon and neutral meson production in relativistic heavy ion collisions are outlined.
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