Abstract
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.
Highlights
The discovery of halo nuclei [1, 2] ushered in the development of radioactive ion beams (RIBs)
This called for better understanding of the interactions of their cousins, the weakly-bound but stable nuclei. Such understanding is essential in relating the internal nuclear structure, e.g. nucleon clustering and low threshold for cluster-breakup [3,4,5,6], to the reaction outcomes, e.g. fusion, nucleon transfer, and breakup [7]
Charged breakup fragments from the reaction were captured in coincidence using BALiN [27], a detector array consisting of four large area double-sided silicon strip detectors (DSSD) arranged in a lamp-shade configuration with apex angle 45◦
Summary
The discovery of halo nuclei [1, 2] ushered in the development of radioactive ion beams (RIBs). This called for better understanding of the interactions of their cousins, the weakly-bound but stable nuclei. Such understanding is essential in relating the internal nuclear structure, e.g. nucleon clustering and low threshold for cluster-breakup [3,4,5,6], to the reaction outcomes, e.g. fusion, nucleon transfer, and breakup [7]. With 6,7Li and 9Be being more accessible, while offering similar characteristics (namely nucleon clustering and low breakup threshold), studying the former presents a great opportunity to understand and predict the behaviour of the much less accessible RIBs
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