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- W2119472354 abstract "The dynamical evolution of nucleus-nucleus collisions is described by a transport equation of the Uehling-Uhlenbeck type. Our model evolves phase-space distribution functions for nucleons, Δ's, N∗(1440)-resonances and pions with their isospin degrees of freedom. The equations are solved by the test-particle simulation method. We apply this model to proton-nucleus and nucleus-nucleus collisions from 400 MeV/A to 2.1 GeV/A. Our approach is found to correctly describe the spectra of baryons and pions. Furthermore, we calculate the production of dileptons considering proton-neutron and pion bremsstrahlung, Δ and N∗ decay and π+π− annihilation. The calculations reproduce the data for p+9Be and for 40Ca + 40Ca at the bombarding energies of 1 GeV/A and 2 GeV/A except for small invariant masses (M⩽ 200 MeV) where the situation is not fully understood. Above 300 MeV dilepton invariant mass the relevant contributions arise from proton-neutron bremsstrahlung, the Δ Dalitz-decay and π+ π− annihilation. At 2 GeV/A for 40Ca + 40Ca, however, we find the bremsstrahlung contribution to be higher than that from pion annihilation." @default.
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- W2119472354 date "1990-10-01" @default.
- W2119472354 modified "2023-10-01" @default.
- W2119472354 title "Dilepton production in heavy-ion collisions" @default.
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- W2119472354 doi "https://doi.org/10.1016/0375-9474(90)90222-8" @default.
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