Transition from complete to incomplete fusion in asymmetric heavy ion reactions

Complex fragments with atomic numbers between those of the target and the projectile have been detected from the reactions of 26 and 31 MeV/nucleon ${}_{}{}^{129}{}_{}{}^{}\mathrm{Xe}$+C, Al, Ti, and Cu. Angular distributions, cross sections, and velocity spectra of these fragments were extracted from the inclusive data. The velocity of the emitting source and Z-total distributions were reconstructed from the twofold coincidence data. These results are used to characterize the emission source of the complex fragments. The results are compared to a geometric incomplete fusion model calculation. Agreement between the model and the data is good.