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Delta and pion abundances in hot dense nuclear matter and the nuclear equation of state
Institution:1. Facility for Antiproton and Ion Research (FAIR), Planckstraße 1, 64291 Darmstadt, Germany;1. Cyclotron Institute and Department of Physics and Astronomy, Texas A&M University, College Station, TX 77843-3366, USA;2. Institut für Theoretische Physik, Johann-Wolfgang-Goethe-Universität Frankfurt, Max-von-Laue-Str. 1, D-60438 Frankfurt, Germany;3. Frankfurt Institute for Advanced Studies, Ruth-Moufang-Str. 1, D-60438 Frankfurt, Germany;1. GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany;2. SUBATECH, UMR 6457, Ecole des Mines de Nantes – IN2P3/CNRS – Université de Nantes, France;1. Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA;2. Joint Institute for Nuclear Astrophysics, University of Notre Dame, Notre Dame, IN 46556, USA;3. Cyclotron and Radioisotope Center, Tohoku University, Sendai 980-8578, Japan;4. Department of Physics, Konan University, Kobe 568-8501, Japan;5. Research Center for Nuclear Physics, Osaka University, Osaka 567-0047, Japan;6. Kernfysisch Versneller Instituut, University of Groningen, 9747 AA Groningen, The Netherlands;7. GANIL, CEA/DSM-CNRS/IN2P3, 14076 Caen, France;8. Division of Physics and Astronomy, Kyoto University, Kyoto 606-8502, Japan;9. Japan Atomic Energy Agency, Kyoto 619-0215, Japan
Abstract:Delta and pion abundances in hot dense nuclear matter are calculated self-consistently within a relativistic mean-field model for different equations of state. The density of deltas turns out to be much more sensitive to the effective masses of the baryons than to the stiffness of the equation of state. The results are compared to experimental pion yields from intermediate-energy nucleus-nucleus collisions. The influence of deviations from thermal momentum distributions for the baryons is estimated.
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