TY - INPR A1 - Konopka, Jens A1 - Bass, Steffen A. A1 - Bleicher, Marcus A1 - Brandstetter, Mathias A1 - Ernst, Christoph A1 - Gerland, Lars A1 - Greiner, Walter A1 - Soff, Sven A1 - Spieles, Christian A1 - Stöcker, Horst A1 - Weber, Henning A1 - Winckelmann, Luke Andreas T1 - Collective flow in heavy ion reactions and the properties of excited nuclear matter N2 - Quantum Molecular Dynamics (QMD) calculations of central collisions between heavy nuclei are used to study fragment production and the creation of collective flow. It is shown that the final phase space distributions are compatible with the expectations from a thermally equilibrated source, which in addition exhibits a collective transverse expansion. However, the microscopic analyses of the transient states in the intermediate reaction stages show that the event shapes are more complex and that equilibrium is reached only in very special cases but not in event samples which cover a wide range of impact parameters as it is the case in experiments. The basic features of a new molecular dynamics model (UQMD) for heavy ion collisions from the Fermi energy regime up to the highest presently available energies are outlined. Y1 - 1996 UR - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/4800 UR - https://nbn-resolving.org/urn:nbn:de:hebis:30-7046 ER -