Beam-energy dependence of spatial and temporal characteristics of shape-selected events in Au+Au collisions at STAR

The correlations measured from the Hanbury Brown and Twiss effect (HBT) allows access to the spatial and temporal characteristics of the systems produced in relativistic heavy-ion collisions. This presentation contains new measurements of the two-pion HBT radii, $\mathrm{R_{out}}$, $\mathrm{R_{side}}$ and $\mathrm{R_{long}}$ which have been made for shape-engineered events by the STAR experiment. Shape selection was accomplished via cuts on the distributions of the second-order flow vector $Q_2$. Selected events, characterized with larger magnitudes of $Q_{2}$, indicate a systematic decrease for $R_{long}$ and $R_{out}$ with little, if any, change for $R_{side}$. Results obtained as a function of collision centrality and average pair transverse momentum ($k_T$) will be presented for the full range of the Au+Au beam energy scan ($\sqrt{s_{NN}} = 7.7 - 200$~GeV). The implications of these results for expansion dynamics of the collision systems will be discussed.