Recent results from the NA49 experiment on Pb-Pb collisions at 158 GeV per nucleon

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作者：
Röhrich, D [1 ]
机构：
[1] Univ Frankfurt, D-6000 Frankfurt, Germany
来源：
INTERNATIONAL EUROPHYSICS CONFERENCE ON HIGH ENERGY PHYSICS | 1999年
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O412 [相对论、场论]; O572.2 [粒子物理学];
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摘要：
Baryon stopping and transverse energy production in central Pb+Pb collisions at 158 GeV per nucleon lead to an estimate of the energy density of 2-3 GeV/fm(3). Multiplicities of strange particles as compared to negatively charged hadrons are higher in heavy ion collisions than in p+p and p+A reactions. Single particle momentum spectra and two particle correlations suggest a rather low temperature (120 MeV) at thermal freeze-out for central Pb+Pb collisions at 158 GeV per nucleon. The matter at freeze-out shows an almost boost-invariant strong longitudinal expansion. The k(perpendicular to) dependence of the transverse radius parameter together with the inverse slopes of the transverse mass spectra indicate significant transverse flow.
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页码：613 / 618
页数：6
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