Berlin 2005 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 22: Postersitzung
HK 22.27: Poster
Montag, 7. März 2005, 16:30–18:00, TU MA141
Anomalous expansion in heavy-ion reactions around Fermi energy — •K. Morawetz1,2, M. Płoszajczak3 und V.D. Toneev4 — 1Institute of Physics, Chemnitz University of Technology, 09107 Chemnitz, Germany — 2Max-Planck-Institute for the Physics of Complex Systems, Nöthnitzer Str. 38, 01187 Dresden, Germany — 3Grand Accélérateur National d’Ions Lourds (GANIL), CEA/DSM – CNRS/IN2P3, BP 5027, F-14076 Caen Cedex 05, France — 4Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russia
Central heavy-ion reactions are simulated within the nonlocal kinetic theory. In the Fermi energy domain the expansion velocity profile is found to be non-Hubblean in the surface region scaling proportional to a higher exponent of the radius. This anomalous expansion velocity profile is accompanied by a specific power law nucleon density profile in the surface region. Both these features disappear at higher energies, and the system follows a uniform Hubble expansion. The interpretation is given in terms of Tsallis statistics revealing a critical behavior pointing towards a phase transition.
[1] P. Lipavský, K. Morawetz, and V. Špička; Annales de Physique, Paris, 2001, No. 26, 1, ISBN 2-86883-541-4
[2] K. Morawetz, P. Lipavsk’y, V. Spicka; Ann. Phys. 294 (2001) 135
[3] K. Morawetz, M. Płoszajczak, V.D. Toneev; Phys. Rev. C 62(2001) 64602
[4] K. Morawetz; Physica A 305 (2002) 234-237