Robert Brockmann, John W. Harris, Andres Sandoval, Reinhard Stock, Herbert Ströbele, Grazyna Janina Odyniec, Howel G. Pugh, Lee S. Schroeder, Rainer Arno Ernst Renfordt, Dietmar Schall, Dieter Bangert, Wolfgang Rauch, Kevin L. Wolf
- 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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