Effect of breakup processes on the near-barrier elastic scattering of the6,7Li +232Th systems

Recent developments in fusion and direct reactions with weakly bound nuclei

“…For 6 Li projectiles, there are several experiments using a wide range of targets: 27 [115]. For all these systems it is observed the presence of the BTA, since the imaginary potential increases as the bombarding energy decreases towards the Coulomb barrier.…”

“…This behavior is also a signature of the BTA, although not so clear as when the imaginary potential increases when the energy decreases. There are also several works on the elastic scattering of 7 Li with different targets, with the aim of investigating the energy dependence of the optical potential at near barrier energies: 27 [115]. In Fig.…”

Elastic scattering of Be7+Si28 at near-barrier energies

“…[16] and named the "breakup threshold anomaly." Currently the new anomaly is reasonably well established for 6 Li but not for 7 Li, although not fully understood, and verified in numerous articles for various targets such as 27 Al [17], 28 Si [11,12] [25], and 232 Th [26]. A review of these measurements can be found in Ref.…”

Study of the threshold anomaly in the elastic scattering of d+ 197Au

“…The BTA analysis has been reported by studying the energy dependence of the optical potential that accounts for the reactions of systems involving stable weakly bound projectiles like 6 Li [12-16, 8, 17-24], 7 Li [8,13,15,19,21,22,24,[24][25][26][27] and 9 Be [28-31, 3, 32], as well as radioactive like 6 He [33,34], 7 Be and 8 B [35]. In all these studies, it was found that the imaginary part of the optical potential does not drop to zero at energies centered on the Coulomb barrier, as expected when the usual TA is observed.…”