Freeze-Out Time in Ultrarelativistic Heavy Ion Collisions from Coulomb Effects in Transverse Pion Spectra
H. W. Barz, J. P. Bondorf, J. J. Gaardhøje, H. Heiselberg
Abstract
The influence of the nuclear Coulomb field on transverse spectra of π+ and π- measured in Pb+Pb reactions at 158 A GeV has been investigated. Pion trajectories are calculated in the field of an expanding fireball. The observed enhancement of the π-/π+ ratio at small momenta depends on the temperature and transverse expansion velocity of the source, the rapidity distribution of the net positive charge, and mainly the time of the freeze-out.
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