Probing nuclear expansion dynamics with ${\pi }^{-}/{\pi }^{+}$-spectra

Abstract

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.

21 pages, latex, figures included

Cited by in corpus (14)

• Hadronic Particle Production in Nucleus-Nucleus Collisions
• The N N -> N Delta cross section in nuclear matter
• System Size and Energy Dependence of Dilepton Production in Heavy-Ion Collisions at SIS Energies
• Photoproduction of phi mesons from nuclei
• In-medium dependence and Coulomb effects of the pion production in heavy ion collisions
• Evidence of kaon nuclear and Coulomb potential effects on soft K+ production from nuclei
• Dilepton production in heavy-ion collisions with in-medium spectral functions of vector mesons
• e^+e^- production from pp reactions at BEVALAC energies
• $e^{+}{e}^{-}$ pairs from ${\pi }^{-}$A reactions
• Relativistic quantum transport theory of hadronic matter: the coupled nucleon, delta and pion system
• Role of isospin dependent mean field in pion production in heavy ion reactions
• $\rho /\omega$ properties from dilepton spectra in $pA$ reactions at 12 GeV
• Effects of retarded electrical fields on observables sensitive to the high-density behavior of nuclear symmetry energy in heavy-ion collisions at intermediate energies
• Impact of the Coulomb field on charged-pion spectra in few-GeV heavy-ion collisions