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A particle-γ -coincidence experiment is performed to investigate the role of high values in the production of direct-α-emitting channels (associated with incomplete fusion) in 12 C + 169 Tm system. Spin distributions of various xn/pxn/αxn/2αxn channels are measured at E lab = 5.6A and 6.5A MeV. Entirely different de-excitation patterns are observed in direct-α-emitting channels and fusion-evaporation channels. The fusion-evaporation channels are found to be strongly fed over a broad spin range. While narrow range feeding for only high-spin states was observed in the case of direct-α-emitting channels, in the present work, incomplete fusion is shown to be a promising tool to populate high-spin states in final reaction products. To have better insight into the associated values in different reaction channels, the present data are compared with similar data obtained in 16 O(E lab ≈ 5.6A MeV) + 169 Tm system. The mean driving angular momenta involved in the production of direct-α-emitting channels are found to be higher than those involved in the production of fusion-evaporation channels. Direct-α multiplicity in the forward cone increases with driving angular momenta, which indicates the origin of direct-α-emitting channels at high values in noncentral interactions.

An experiment was carried out to explore heavy ion incomplete fusion reaction dynamics, within the framework of the break-up fusion model, at energies near and above the Coulomb barrier. Excitation functions for several radionuclides produced via xn, pxn, and αxn channels were measured in the 16 O + 181 Ta system at energies of ≈76-100 MeV. The experimental excitation functions were compared with those calculated using the theoretical model code PACE4. It was observed that excitation functions of xn/pxn channels are in good agreement with theoretical predictions. However, a significant enhancement in the measured excitation functions of α-emitting channels was observed and attributed to the incomplete fusion processes. The incomplete fusion fraction (F ICF ) that gives the relative importance of complete and incomplete fusion processes was found to increase with energy. The results are discussed in terms of α-cluster structure of the projectile on various fusion reactions.

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