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

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

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