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[Background] Despite the importance of light-ion fusion in nucleosynthesis, alimited amount of data exists regarding the de-excitation following fusion forsuch systems. [Purpose] To explore the characteristics of alpha emissionassociated with the decay of light fused systems at low excitation energy.[Method] Alpha particles were detected in coincidence with evaporation residues(ER) formed by the fusion of 18O and 12C nuclei. Both alpha particles and ERswere identified on the basis of their energy and time-of-flight. ERs werecharacterized by their energy spectra and angular distributions while the alphaparticles were characterized by their energy spectra, angular distributions,and cross-sections. [Results] While the energy spectra and angulardistributions for the alpha particles are well reproduced by statistical modelcodes, the measured cross-section is substantially underpredicted by themodels. Comparison with similar systems reveals that the fundamental quantityfor the alpha cross-section is Ec.m. and not the excitation energy of the fusedsystem. [Conclusion]The enhancement in the measured alpha cross-section ascompared to the statistical model codes and its dependence with Ec.m. suggestthat a coupling between pre-existing alpha cluster structure and the collisiondynamics is responsible for the observed alpha cross-section.

Does the alpha cluster structure in light nuclei persist through the fusion process?