Abstract
Evaporation residues (ER) of $Z=34--42$ were measured in coincidence with emitted protons, deuterons, tritons, and \ensuremath{\alpha} particles for the reaction ${}^{84}\mathrm{Kr}{+}^{27}\mathrm{Al}$ at a ${}^{84}\mathrm{Kr}$ bombarding energy of 1260 MeV. Our study demonstrates the presence of a strong preequilibrium component in the reaction yield. The assumption of a forward center-of-mass angular distribution for the emission of energetic protons and \ensuremath{\alpha}, following full momentum transfer, gives the best description of the observed experimental data. This description differs substantially from the one provided by prevailing models of incomplete fusion.
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