Properties of the nuclear equation of state (EoS) can be probed by measuring
the dynamical properties of nucleus-nucleus collisions. In this study, we
present the directed flow (v1), elliptic flow (v2) and stopping (VarXZ)
measured in fixed target Sn + Sn collisions at 270 AMeV with the SπRIT Time
Projection Chamber. We perform Bayesian analyses in which EoS parameters are
varied simultaneously within the Improved Quantum Molecular Dynamics-Skyrme
(ImQMD-Sky) transport code to obtain a multivariate correlated constraint. The
varied parameters include symmetry energy, S0, and slope of the symmetry
energy, L, at saturation density, isoscalar effective mass, ms∗/mN,
isovector effective mass, mv∗/mN and the in-medium cross-section
enhancement factor η. We find that the flow and VarXZ observables are
sensitive to the splitting of proton and neutron effective masses and the
in-medium cross-section. Comparisons of ImQMD-Sky predictions to the SπRIT
data suggest a narrow range of preferred values for ms∗/mN,
mv∗/mN and η