Freeze-out time in ultrarelativistic heavy ion collisions from Coulomb effects in transverse pion spectra
作者： H. W. Barz , J. P. Bondorf , J. J. Gaardhøje , H. Heiselberg
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摘要: The influence of the nuclear Coulomb field on transverse spectra ${\ensuremath{\pi}}^{+}$ and ${\ensuremath{\pi}}^{\ensuremath{-}}$ measured in Pb+Pb reactions at $158A$ GeV has been investigated. Pion trajectories are calculated an expanding fireball. observed enhancement ${\ensuremath{\pi}}^{\ensuremath{-}}/{\ensuremath{\pi}}^{+}$ ratio small momenta depends temperature expansion velocity source, rapidity distribution net positive charge, mainly time freeze-out.
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