Nuclear geometry and pre-equilibrium phase effects on high-energy isobar collisions

Ultrarelativistic isobar collisions can be used to determine nuclear structure. In systems of this nature, instantaneous achievement of local thermal equilibrium is not achievable, consequently requiring a prethermalization phase. In this phase, there is a possibility that some of the initial structure information may be lost and artifacts may be introduced during its determination. This research employs free-streaming to model the prethermalization phase, thus reducing information loss. We systematically change nuclear structure parameters from $^{96}_{44}$Ru to $^{96}_{40}$Zr in order to investigate their impact on system eccentricities. For the first time it was calculated in the case of isobars, the Pearson coefficient for momentum and flow, from properties of the initial matter, in which an appropriate estimator for the momentum was used. Our findings suggest the potential for utilizing this estimator in conjunction with anisotropies to constrain nuclear structure parameters.