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The origin of the large $\alpha$ particle production and incomplete fusion inreactions involving weakly-bound $\alpha$+$x$ cluster nuclei still remainsunresolved. While the (two-step) process of breakup followed by capture of the``free" complementary fragment ($x$) is widely believed to be responsible, afew recent studies suggest the dominant role of (direct) cluster stripping. Toachieve an unambiguous experimental discrimination between these two processes,a coincidence measurement between the outgoing $\alpha$ particles and $\gamma$rays from the heavy residues has been performed for the$^7$Li($\alpha$+triton)+$^{93}$Nb system. Proper choice of kinematicalconditions allowed for the first time a significant population of the regionaccessible only to the direct triton stripping process and not to breakupfollowed by the capture of the ``free'' triton (from the three-body continuum).This result, also supported by a cluster-transfer calculation, clearlyestablishes the dominance of the direct cluster-stripping mechanism in thelarge alpha production.

Unraveling the reaction mechanism for large alpha production and incomplete fusion in reactions involving weakly bound stable nuclei