\begin{document}$^{64}\mathrm{Ni}+{}^{238}\mathrm{U}$\end{document} reaction at \begin{document}$E_{\mathrm{c.m.}}=301.05 ~\;\mathrm{MeV}$\end{document} is investigated within the Boltzmann–Uehling–Uhlenbeck transport framework. Three representative orientations of the deformed \begin{document}$^{238}\mathrm{U}$\end{document} target are considered, and an event-by-event window analysis is performed to connect final-state observables with the underlying contact-stage dynamics. The calculated fragment mass distribution, mass–angle distribution, and mass–total-kinetic-energy correlation reproduce the main qualitative features of the available experimental data, including the double-humped mass structure and the weak population near mass symmetry. Within the present event-identification criterion and evolution time, no fusion events are identified. The x orientation gives the largest quasifission component and the strongest mass drift toward symmetry, the z orientation is intermediate, whereas the y orientation is dominated by quasielastic or weakly dissipative events. The analysis of the contact probability \begin{document}$P_{\rm{cont}}(b)$\end{document}, contact time \begin{document}$T_{\rm{cont}}$\end{document}, and fragment Z, N, and \begin{document}$N/Z$\end{document} indicates that the orientation dependence originates from the combined effects of contact formation, contact lifetime, and nucleon-exchange efficiency through the neck region. An additional reference calculation using an artificially spherical \begin{document}$^{238}\mathrm{U}$\end{document} nucleus shows that, although the contact probability remains comparable to those of the x and z orientations, the contact time is significantly reduced. This result suggests that the deformation of \begin{document}$^{238}\mathrm{U}$\end{document} primarily enhances the persistence of the dinuclear configuration rather than simply increasing the probability of initial contact formation. These results provide a dynamical interpretation of how the entrance-channel orientation governs the branching between quasielastic and quasifission trajectories."> Dynamic description and orientation effects in the near-Coulomb barrier <sup>64</sup>Ni + <sup>238</sup>U reaction -
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