Probing nuclear expansion dynamics with π-/π+-spectra
S. Teis, W. Cassing, M. Effenberger, A. Hombach, U. Mosel, Gy. Wolf
Abstract
We study the dynamics of charged pions in the nuclear medium via the ratio of differential π-- and π+-spectra in a coupled-channel BUU (CBUU) approach. The relative energy shift of the charged pions is found to correlate with the pion freeze-out time in nucleus-nucleus collisions as well as with the impact parameter of the heavy-ion reaction. Furthermore, the long-range Coulomb force provides a 'clock' for the expansion of the hot nuclear system. Detailed comparisons with experimental data for Au + Au at 1 GeV/A and Ni + Ni at 2.0 GeV/A are presented.
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