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- W2023821936 abstract "Dilepton production is studied in heavy-ion collisions at bombarding energies from 60 to 400 MeV/nucleon. The dynamical evolution of the nucleus-nucleus collisions is described by a transport equation of the Vlasov-Uehling-Uhlenbeck type including explicitly pion and ensuremath{Delta}(1232) degrees of freedom and considering free on-shell production processes. We calculate the contribution of proton-neutron bremsstrahlung, ${mathrm{ensuremath{pi}}}^{0}$ and ensuremath{Delta} Dalitz decay, and ${mathrm{ensuremath{pi}}}^{+}$${mathrm{ensuremath{pi}}}^{mathrm{ensuremath{-}}}$ annihilation. At 60 MeV/nucleon bombarding energy proton-neutron bremsstrahlung dominates while around 100 MeV/nucleon most of the ${mathit{e}}^{+}$${mathit{e}}^{mathrm{ensuremath{-}}}$ cross section arises from ${mathrm{ensuremath{pi}}}^{0}$ decay. At 400 MeV/nucleon, however, the ensuremath{Delta} Dalitz decay is the most important dilepton source for invariant masses M>140 MeV thus offfering the possibility to study in-medium properties of this resonance." @default.
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- W2023821936 date "1991-04-01" @default.
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- W2023821936 title "Dilepton production at intermediate-energy heavy-ion collisions" @default.
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- W2023821936 doi "https://doi.org/10.1103/physrevc.43.r1501" @default.
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