Effects of coupling to breakup in theLi6,7+Zn64systems at near-barrier energies

Abstract

Elastic scattering angular distributions for the weakly bound nucleus 7 Li on 64 Zn have been measured in a wide angular range at energies around the Coulomb barrier. The present experimental data and our previously measured elastic scattering data for the system 6 Li + 64 Zn have been analyzed within the continuum-discretized coupled-channels method, where the resonant and nonresonant states of the projectile are taken into account. In this theoretical framework, we have also analyzed our previously measured excitation functions of elastic scattering at backward angles and the corresponding barrier distributions for the same systems. A good agreement between the experimental data and the calculations has been observed. The obtained results, besides confirming the importance of the coupling to the breakup channels in collisions with weakly bound nuclei, show that, in the case of 6 Li, the inclusion of the resonant states of the projectile produces non-negligible effects.

Breakup of Li6+p at near-barrier energies and the effect on elastic scattering

“…The effect of breakup coupling on the elastic channel was strong, with the most significant contribution coming from sequential breakup via the first resonance at 2.186 MeV. This is in accordance with similar findings for medium and heavy mass targets [22,23]. From an inspection of Table III, where in the third column we present total breakup cross sections and in parentheses sequential breakup cross sections via the 3 1 + resonance, we can conclude that the sequential breakup accounts for ∼50% of the total breakup for the highest two energies, ∼38% at 20 MeV and almost zero for the lowest energy, 16 MeV.…”

“…It has mainly been investigated in exclusive measurements at near-barrier energies on light [5,6], medium [7][8][9][10][11], and heavy targets [12][13][14][15][16][17][18][19][20]. Interest has also been shown in the effect of breakup on the elastic scattering [21][22][23]. The only existing breakup measurement, p + 6 Li, reported in Ref.…”

Probing the cluster structure ofLi7via elastic scattering on protons and deuterons in inverse kinematics

“…Couplings to the continuum were found to be weak, while couplings to the resonant states were strong, especially at the higher energies [33]. It should be noted here that strong couplings to resonance states were also reported previously for 6,7 Li scattering from heavy targets [34,35]. However, for our system, 7 Li + p, we expect small contributions from couplings to both the continuum and the resonant states, as the available energy is insufficient for such excitations.…”

Sub-barrier fusion of weakly bound Li6 with Ni58

“…Subsequent CDCC analyses of the corresponding elastic scattering angular distributions for this system [10] showed important effects of coupling to breakup channels. At the lowest incident energies a significant effect of coupling to resonant states of 6 Li also was found.…”