Reaction mechanism in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">O</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>16</mml:mn></mml:mrow></mml:mmultiscripts><mml:mo>+</mml:mo><mml:mmultiscripts><mml:mi mathvariant="normal">Al</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>27</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>system: Measurements and analysis of excitation functions and angular distributions

To study the dynamics of heavy ion fusion reactions in the lower mass region, experiments were carried out to measure the cross sections of radioactive residues produced in the interaction of the $^{16}\mathrm{O}$ ion with $^{27}\mathrm{Al}$ target nucleus at 19 different energies in very close intervals covering the energy range from $\ensuremath{\approx}58$ to 94 MeV, using the well-known recoil catcher off-line \ensuremath{\gamma}-ray spectroscopy technique. The simulation of experimental data was performed using statistical-model-based computer codes, viz., CASCADE, PACE2, and ALICE-91. The analysis of measured excitation functions indicates that these residues are likely to be produced by complete fusion, incomplete fusion, and direct reaction processes. Furthermore, to confirm the contribution of different reaction channels, a complementary experiment was performed that measured the angular distributions of the residues produced in the $^{16}\mathrm{O}+^{27}\mathrm{Al}$ system at 85 MeV beam energy. The analysis of the results of both experiments indicates that at these energies, the direct reactions compete with complete fusion and incomplete fusion reaction processes.

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