Bulk Nuclear Properties from Pion Yield
- Jun Hong, MSU - NSCL/Physics
Thursday, March 14, 11:00 AM - Research Discussion
NSCL Lecture Hall
Intermediate energy (100 MeV/A ~ 2 GeV/A) heavy ion collisions have been a powerful tool to extract information on bulk properties of nuclear matter. We find that net pion yields in central collisions are strongly sensitive to the momentum dependence of isoscalar nuclear mean field. We have re-examined the momentum dependence assumed in the Boltzmann equation model for the collisions and found new parameterization to describe FOPI pion yield measurements in the Au + Au collisions at different beam energies. We also check the new mean field with baryonic elliptic flow measurements. On the other hand, ratios of charged pions from central collisions are believed to provide information about symmetry energy at supranormal densities. While our results differ in detail from some in the literature, we have optimized the observables exploiting differences between the charged pions, to provide the best guidance on the symmetry energy at supranormal densities, in central collision experiments.