Speaker
Description
The isospin of pions has long time been discussed as signal of the equation of state of asymetric matter. Especially in collisions of heavy ions (like Au+Au) at energies of several hundred MeV, the ratio of negative and positive pions has been proposed to be sensitive to isospin dependent potentials. However, the conclusions from comparison to experimental FOPI data have been rather controverse. We use the Isospin Quantum Molecular Dynamics Model (IQMD) to study the production and rescattering of pions in such reactions. We found the influence of different effects but however a very significant contribution from the definition of the radii of proton and neutron distributions, i.e. the neutron skin. We will analyse the effects of the neutron skin as function of energy, mass and centrality and discuss how to obtain information on the neutron skin from pion measurements.
