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Background: The understanding of the impact of initial deformation and collision orientation on quasifission and fusion-fission reactions remains incomplete. Purpose: This paper aims to explore how the orientation of deformed nuclei influences quasifission and fusion-fission reactions around 1. 2V₁, employing a microdynamical method in systems with diverse shapes, namely ^24Mg+^178Hf, ^34S+^168Er, and ^48Ti+^154Sm. Method: Utilizing the Boltzmann-Uehling-Uhlenbeck model, this paper investigates quasifission and fusion-fission reactions. The model elucidates microdynamic 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 quasifission and fusion-fission reactions. 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 orientation. The paper 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 paper concludes that the orientation of the target nucleus is the key factor influencing quasifission and fusion-fission reactions around 1. 2V₁.
Feng et al. (Tue,) studied this question.