Speaker
Prof.
Hermann Wolter
(Univeristy of Munich)
Description
Transport descriptions of heavy ion collisions in the intermediate energy range are an important method to extract information on the nuclear equation-of-state which is also relevant for astrophysical processes. Different transport model codes have been developed and applied widely. The physical deductions of such analyses should be independent as much as possible of the particular model, or at least, differences should be well understood. However, this has not always been the case in recent analyses, e.g. of pion production.
In view of this a transport code evaluation project under controlled conditions with the participation of most of the widely used codes has been initiated some time ago to understand these differences. A first study was made for Au+Au collisions, which showed rather substantial differences. To investigate these further, comparisons were made of calculations in infinite nuclear matter, which can be realized in a good approximation in a box with periodic boundary conditions. In this set-up the different aspects of a transport calculation can be investigated separately and can be compared against analytical results. We have completed a study of the collision term, and found an important influence of the fluctuations, which are intrinsically built into the codes, e.g. on the Pauli-blocking behavior. Work on the mean field propagation and on pion production is in progress. In this talk I will give an overview of the status and conclusions of these comparisons and discuss implications on transport code development and future directions.
Primary author
Prof.
Hermann Wolter
(Univeristy of Munich)
