Latest documents http://publikationen.ub.uni-frankfurt.de/index/index/ Tue, 10 May 2005 13:57:13 +0200 Tue, 10 May 2005 13:57:13 +0200 http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/3734 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. 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 article http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/3734 Wed, 05 Oct 2005 13:57:13 +0200