One-neutron stripping processes to excited states of theLi6+Zr96reaction at near-barrier energies

Classical dynamical modelling of near-barrier breakup

“…Indeed, many works have noted a correlation between the direct breakup threshold and the degree of fusion suppression [19,20]. This correlation is apparent not only for weakly-bound stable nuclides such as 6,7 Li, 9 Be and 6 He, but also for more well-bound nuclides such as 10,11 B, 12,13 C and 16 O. So on the face of it we might conclude that direct breakup causes fusion suppression.…”

“…The strong binding of the α-particle means that light nuclides with A < 10 have low cluster breakup thresholds: 6 Li→ α + d at 1.474 MeV, 7 Li→ α + t at 2.468 MeV, and 9 Be→ α + α + n at 1.665 MeV. Direct excitation of the intrinsic cluster continuum of the projectile is one possible trigger of breakup.…”

“…The strong binding of the α-particle makes nuclides with A < 10 intrinsically fragile. The lowest cluster separation thresholds for the stable nuclides 6 Li, 7 Li and 9 Be are all less than 2.5 MeV [2]. This makes them liable to breakup in nuclear collisions, which in turn is believed to have importance consequences for fusion.…”

“…[5] for � e-mail: edward.simpson@anu.edu.au a recent review). FUSION17 encompassed a large number of talks addressing different aspects of the reactions of these light weakly-bound nuclides, including measurements of fusion and reaction cross sections (Aguilera [6]), quasielastic scattering (Mukherjee), charged-particle conincidences (Kalkal [7], Cook [8], G. L. Zhang [9]), and attempts to model incomplete fusion (Parkar [10]). …”

“…Blue lines indicate neutron transfers, red lines indicate proton transfers, and the purple line indicates np transfer. 5 Li and 8 Be are both unbound, and though 6,7 Li and 9 Be are bound, their cluster breakup thresholds are low.…”