Pion and proton "temperatures" in relativistic heavy-ion reactions

Pion and proton production are measured to investigate thermal equilibrium in central collisions of 40Ar+KCl at 1.8 GeV/nucleon. The bulk of the pion yield is isotropic in the c.m. system, with an apparent temperature of
Pion and proton production are measured to investigate thermal equilibrium in central collisions of 40Ar+KCl at 1.8 GeV/nucleon. The bulk of the pion yield is isotropic in the c.m. system, with an apparent temperature of 58±3 MeV, much lower than the 118±2 MeV of the protons. It is shown that the low pion "temperature" can be explained by the decay kinematics of delta resonances in thermal equilibrium. A (5±1)% component in the pion spectrum is, however, found to have a temperature of 110±10 MeV. The effect on the spectra of possible contributions from collective radial flow is discussed.
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Author:R. Brockmann, J. W. Harris, A. Sandoval, Reinhard Stock, Herbert Ströbele, G. Odyniec, H. G. Pugh, L. S. Schroeder, R. E. Renfordt, D. Schall, K. Bangert, W. Rauch, K. L. Wolf
URN:urn:nbn:de:hebis:30-17500
Document Type:Article
Language:English
Date of Publication (online):2005/10/05
Year of first Publication:1984
Publishing Institution:Univ.-Bibliothek Frankfurt am Main
Release Date:2005/10/05
Source:Phys. Rev. Lett. 53, 2012-2015, ©1983 The American Physical Society, http://link.aps.org/abstract/PRL/v53/p2012
HeBIS PPN:186959982
Institutes:Physik
Dewey Decimal Classification:530 Physik
Sammlungen:Universitätspublikationen
Licence (German):License Logo Veröffentlichungsvertrag für Publikationen

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