TY - JOUR A1 - Magas, Volodymyr A1 - Csernai, László Pal A1 - Molnár, Etele T1 - Bjorken hydrodynamics and gradual freeze out T2 - Proceedings of Science, Critical Point and Onset of Deconfinement, July 3 - 6 2006, Florence, Italy N2 - The freeze out of the expanding systems, created in relativistic heavy ion collisions, is discussed. We combine kinetic freeze out equations with Bjorken type system expansion into a unified model. The important feature of the proposed scenario is that physical freeze out is completely finished in a finite time, which can be varied from 0 (freeze out hypersurface) to infinit. The dependence of the post freeze out distribution function on the freeze out time will be studied. Model allows analytical analyses for the simplest systems such as pion gas. We shall see that the basic freeze out features, pointed out in the earlier works, are not smeared out by the expansion of the system. The entropy evolution in such a scenario is also studied. Y1 - 2006 UR - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/1013 UR - https://nbn-resolving.org/urn:nbn:de:hebis:30-45330 N1 - Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence. VL - 031 IS - CPOD2006) ER -