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Excitation functions and recoil range distributions for radioactive products formed in the reactions of 12 C on 89 Y have been measured using catcher foil technique followed by gamma-ray spectrometry. The alpha emission products show higher cross sections than that predicted for complete fusion. Recoil range distributions of evaporation residues indicate incomplete momentum transfer events. Detailed Monte Carlo simulation of the shapes of recoil range distributions for these processes have been carried out using PACE2 code to extract the contributions of incomplete fusion in the individual channels. From the relative yields of incomplete fusion products the excitation energy and angular momentum of the incompletely fused composite nucleus have been deduced. The values agree well with the break-up fusion model of the incomplete fusion.

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Excitation functions for 17 evaporation residues were measured for the 16 O + 93 Nb system in the energy range 4-6 MeV/nucleon. The experimental results were compared with the theoretical values calculated using the Monte Carlo simulation code PACE2. Several complete and incomplete fusion products were observed in the present study. It was observed that a definite amount of incomplete fusion contribution is present even at the lowest energy. The results indicate the occurrence of incomplete fusion involving breakup of 16 O into 8 Be + 8 Be followed by fusion of one of the fragments with the target nucleus.