Abstract
We report a few selected results from systematic studies of e+ e− production in C+C, Ar+KCl, p+p, d+p and p+Nb collisions performed by the High-Acceptance Di-Electron Spectrometer (HADES) in the energy domain of 1–3.5 GeV kinetic energy per nucleon. The comparison of a N+N reference spectrum with the di-electron invariant-mass distribution measured in Ar+KCl collisions shows pronounced excess radiation. Medium effects have been further investigated in p+Nb interactions at 3.5 GeV by a direct comparison to p+p reactions measured at the same beam energy.
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