  In this work, we perform a model-to-data comparison for U+U and Au+Au
collisions performed at RHIC at $\sqrt{s_{\rm NN}}$ = $193$ GeV and $200$ GeV,
using a multistage framework. Model calculations for various configurations of
$^{238}$U and $^{197}$Au are used to compare with measurements of
$\rho(v_n\{2\}^2,\left\langle p_T \right\rangle)$, the elliptic-flow-momentum
correlator, for the first time. It is found that momentum-flow correlations
measured in high-energy nuclear collisions, combined with the flow harmonics
themselves, are excellent probes of nuclear deformation and of nuclear
structure in general.
