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Universal pion freeze-out phase-space density

Authors
Journal
Nuclear Physics A
0375-9474
Publisher
Elsevier
Publication Date
Volume
661
Identifiers
DOI: 10.1016/s0375-9474(99)85044-1

Abstract

Abstract Results on the pion phase-space density at freeze-out in sulphur-nucleus, Pb-Pb and π-p collisions at the CERN SPS are presented. All heavy-ion reactions are consistent with the thermal Bose-Einstein distribution ƒ = [exp( E/T) − 1] −1 at T ∼ 120 MeV, modified for radial expansion. π-p data are also consistent with ƒ, but at T ∼ 180 MeV and without radial flow.

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