Predominance of transfer in triggering breakup in sub-barrier reactions of 6^,7Li with 144Sm, 207^,208Pb, and 209Bi

Coincidence measurements of breakup fragments were carried out for the 7Li+144Sm and 6^,7Li+207^,208Pb,209Bi reactions at sub-barrier energies. Breakup modes in reactions of 6^,7Li were identified through the reaction Q values, and the time-scales of each process inferred through the relative energy of the breakup fragments. Breakup was found to be predominantly triggered by nucleon transfer, with p pickup leading to α+α coincidences being the preferred breakup mode for 7Li, and n stripping leading to α+p for 6Li. Breakup triggered by 2n stripping was also found to be prominent in the 7Li+144Sm reaction. The breakup yields were separated into prompt and delayed components based on the relative energies of the breakup fragments. This enables the identification of breakup process important in the suppression of complete fusion of 6^,7Li at above-barrier energies.