Probing nuclear expansion dynamics with $π^-/π^+$-spectra

Details Probing nuclear expansion dynamics with $π^-/π^+$-spectra Probing nuclear expansion dynamics with $π^-/π^+$-spectra

1997-01-28

arxiv.org/abs/nucl-th/9701057v1

Z.Phys. A359 (1997) 297-304

Physics

Nuclear Physics

Nuclear Theory

21 pages, latex, figures included

Scientific paper

10.1007/s002180050405

We study the dynamics of charged pions in the nuclear medium via the ratio of differential $\pi^-$- and $\pi^+$-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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