Freeze-out time in ultrarelativistic heavy ion collisions from Coulomb effects in transverse pion spectra

Journal Article · Mon Sep 01 00:00:00 EDT 1997 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.56.1553· OSTI ID:560985

Barz, H W ^[1]; Bondorf, J P; Heiselberg, H ^[2]

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1. Institut fuer Kern- und Hadronenphysik, FZ Rossendorf, Postfach 510119, D-01314 Dresden (Germany)
2. NORDITA, Blegdamsvej 17, DK-2100 Copenhagen (Denmark)

The influence of the nuclear Coulomb field on transverse spectra of {pi}{sup +} and {pi}{sup {minus}} measured in Pb+Pb reactions at 158A GeV has been investigated. Pion trajectories are calculated in the field of an expanding fireball. The observed enhancement of the {pi}{sup {minus}}/{pi}{sup +} 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. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 560985
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 3 Vol. 56; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CHARGE DISTRIBUTION
COULOMB FIELD
FIREBALL MODEL
FREEZING OUT
HEAVY ION REACTIONS
LEAD
PARTICLE PRODUCTION
PIONS MINUS
PIONS PLUS
TEMPERATURE DEPENDENCE
TEV RANGE 10-100
TRANSVERSE ENERGY