Breakup mechanisms for ⁷Li + ¹⁹⁷Au, ²⁰⁴Pb systems at sub-barrier energies

Coincidence measurements of breakup fragments were carried out for the ⁷Li + ¹⁹⁷Au and ²⁰⁴Pb 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 ⁷Li were found to be predominantly triggered by nucleon transfer, with p-pickup leading to ⁸Be → α + α 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 ⁷Li at above-barrier energies.