Elastic scattering and Li 7 production in the Li 8 + Sn 120 reaction

Santos O.C.B.; Filho R.L.; Pires K.C.C.; Umbelino U.; Zevallos E.O.N.; De Lara A.L.; Serra A.S.; Scarduelli V.; Alcántara-Núñez J.; Lépine-Szily A.; Moro A.M.; Appannababu S.; Assunção M.; Lei J. · Physical Review C (2024) · DOI: 10.1103/physrevc.110.034610

Resumen

The Li8+Sn120 collision has been investigated at laboratory energies of 21.7 and 25.8 MeV (VCBlab=20.5 MeV). The Li8+Sn120 elastic scattering and the Li7 fragment angular and energy distributions from the Sn120(Li8,Li7)X reaction have been measured. The elastic scattering angular distributions were analyzed by optical model and coupled reaction channels (CRC) calculations considering the coupling with the neutron stripping channel. The effect of the projectile breakup on the elastic scattering distributions has been studied via continuum-discretized coupled-channels (CDCC) calculations. The experimental Li7 energy distribution presents characteristics similar to a neutron transfer reaction populating a wide range of excited states in the recoil system, from the ground state up to states above the neutron threshold, with a maximum in the excitation energy predicted by Q-optimum arguments. These energy distributions, as well as the corresponding Li7 angular distributions, are well described using the Ichimura, Austern, and Vincent (IAV) model, which includes the neutron transfer to bound and unbound states of the target nucleus. The total reaction cross sections from the elastic scattering angular distributions and total breakup cross sections have been obtained from the IAV plus CDCC and CRC calculations. A comparison with previous measurements of the Li8 scattering on Be9 and Ni58 targets is presented. A dominance of the transfer to bound states over the breakup channel is seen in the present case.

Instituciones: Universidad Científica del Sur