TY  - JOUR
A1  - Brockmann, Robert
A1  - Harris, John W.
A1  - Sandoval, Andres
A1  - Stock, Reinhard
A1  - Ströbele, Herbert
A1  - Odyniec, Grazyna Janina
A1  - Pugh, Howel G.
A1  - Schroeder, Lee S.
A1  - Renfordt, Rainer Arno Ernst
A1  - Schall, Dietmar
A1  - Bangert, Dieter
A1  - Rauch, Wolfgang
A1  - Wolf, Kevin L.
T1  - Pion and proton "temperatures" in relativistic heavy-ion reactions
T2  - Physical review letter
N2  - 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.
Y1  - 2005
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/3734
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30-17500
UR  - http://link.aps.org/abstract/PRL/v53/p2012
VL  - 53
IS  - 21
SP  - 2012
EP  - 2015
ER  -