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 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:Robert Brockmann, John W. HarrisORCiDGND, Andres SandovalORCiD, Reinhard StockGND, Herbert Ströbele, Grazyna Janina Odyniec, Howel G. Pugh, Lee S. Schroeder, Rainer Arno Ernst Renfordt, Dietmar Schall, Dieter Bangert, Wolfgang Rauch, Kevin L. Wolf
Parent Title (German):Physical review letter
Document Type:Article
Date of Publication (online):2005/10/05
Year of first Publication:1984
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2005/10/05
Page Number:4
First Page:2012
Last Page:2015
Source:Phys. Rev. Lett. 53, 2012-2015, ©1983 The American Physical Society, http://link.aps.org/abstract/PRL/v53/p2012
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoDeutsches Urheberrecht