Semiclassical transport of hadrons with dynamical spectral functions in A+A collisions at SIS/AGS energies

The transport of hadrons with dynamical spectral functions A(h) (X, (P) ove r right arrow, M-2) is studied for nucleus-nucleus collisions at SIS and AG S energies in comparison to the conventional quasiparticle limit and the av ailable experimental data within the recently developed off-shell HSD trans port approach. Similar to reactions at GANIL energies the off-shell effects show up in high momentum tails of the particle spectra, however, at SIS an d AGS energies these modifications are found to be less pronounced than at lower energies due to the high lying excitations of the nucleons in the col lision zone. (C) 2000 Elsevier Science B.V. All rights reserved.