When observed in singles, complex fragments associated with the 18A-MeV ${}_{}{}^{139}{}_{}{}^{}\mathrm{Ni}$ reaction present a complex invariant-cross-section pattern without an obvious source, while the center-of-mass velocities of the coincident binary events span the entire range from complete fusion to near projectile velocities. By gating on a given value of the source velocity, it is possible to characterize precisely the product formed in the corresponding incomplete-fusion process and its decay.

• Received 29 December 1988

DOI:https://doi.org/10.1103/PhysRevLett.62.1833