  Background: The understanding of the impact of initial deformation and
collision orientation on quasi-fission and fusion-fission reactions remains
incomplete. Purpose: This article aims to explore how the orientation of
deformed nuclei influences quasi-fission and fusion-fission around 1.2 VB,
employing a micro dynamical method in systems with diverse shapes, namely 24Mg
+ 178Hf, 34S + 168Er, and 48Ti + 154Sm. Method: Utilizing the
Boltzmann-Uehling-Uhlenbeck model, this study investigates quasi-fission and
fusion fission reactions. The model elucidates micro-dynamic processes and
microscopic observables through the definition of the window and event-by-event
simulations. Results: The findings reveal that the orientation of deformed
nuclei significantly influences the nucleus-nucleus interaction potential,
thereby impacting the competition between quasi-fission and fusion-fission.
Particularly, the orientation of the deformed target nucleus emerges as the
primary factor affecting this competition. Notably, a higher proportion of
fusion-fission events is observed when the target nucleus is in the belly
orientation compared to the tip. The study also observes that the configuration
of the dinuclear system contributes to fluctuations and dissipation. Collisions
with different orientations result in distinct dinuclear system configurations,
with belly-oriented collisions leading to larger fluctuations between events,
while tip-oriented collisions exhibit smaller fluctuations. Conclusions:
Considering diverse orientations of nuclei with distinct initial deformations,
this study concludes that the orientation of the target nucleus is the key
factor influencing quasi-fission and fusion-fission reactions around 1.2 VB.
