Abstract
Coincidence measurements of breakup fragments were carried out for the Li-7 + Au-197 and Pb-204 systems at sub-barrier energies. The mechanisms triggering breakup, and time-scales of each process, were identified through the reaction Q-values and the relative energy of the breakup fragments. Binary breakup of Li-7 were found to be predominantly triggered by nucleon transfer, with p-pickup leading to Be-8 -> alpha + alpha decay being the preferred breakup mode. From the time-scales of each process, the coincidence yields were separated into prompt and delayed components, allowing the identification of breakup process important in the suppression of complete fusion of Li-7 at above-barrier energies.