Speaker
Description
The nuclear symmetry energy and its density dependence, particularly
above saturation density, remain among the most significant
uncertainties in the nuclear equation of state (EoS). These properties
play a crucial role in both intermediate-energy heavy-ion collisions and
the structure of neutron star matter. Experimental information at supra-
saturation densities, however, is still limited, making such collisions a
powerful probe of the symmetry energy.
In this study, we investigate the $ {}^{129,124} \mathrm{Xe} + {}^{124,112} \mathrm{Sn} $ reactions at $ 100
\, \mathrm{MeV} $ per nucleon, measured in 1998 at GSI by the INDRA–ALADIN
collaboration. Directed and elliptic flow parameters extracted from the
experiment are compared with transport model calculations employing
the Improved Quantum Molecular Dynamics (ImQMD) framework. Two
Skyrme parameterizations SkM* and Sly4, differing in their treatment of
the iso-vector effective mass and neutron–proton effective mass
splitting, were implemented in the simulations.
By confronting experimental flow observables with theoretical
predictions, we assess the sensitivity of collective dynamics to effective
mass at supra-saturation densities. Our findings provide new constraints
on the density dependence of the symmetry energy in the intermediate-
to-high density regime, thereby contributing to a more precise
determination of the nuclear EoS.
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