Towards quantitative symmetry energy constraints from isospin transport in heavy ion collisions
Résumé
Heavy ion reactions provide a unique opportunity to measure the Equation of State (EoS) of baryonic matter in a large density domain, but to get quantitative constraints observables have to be used that are as insensitive as possible to final state interaction, and at the same time robustly predicted by transport models with limited model dependence. In this work, we compare for the first time BUU transport calculations to the impact parameter dependence of the isospin transport ratio deduced from INDRA-FAZIA data [1]. Using different state-of-the-art nuclear functionals, provided both by ab initio calculations and by phenomenological approaches, a confidence region for the symmetry energy is extracted, which can be used to inform Bayesian inference of the neutron star EoS.
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