Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf
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Freeze-Out Time in Ultrarelativistic Heavy Ion Collisions from Coulomb Effects in Transverse Pion SpectraBarz, H.-W.; Bondorf, J. P.; Gaardhoje, J. J.; Heiselberg, H.
The influence of the nuclear Coulomb field on transverse spectra of λ + and λ- 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 λ-/λ+ 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.
- Physical Review C 56, No. 3, September 1997, 1553-1556
- Forschungszentrum Rossendorf; FZR-168 Preprint