Be9+Sn120 scattering at near-barrier energies within a four-body model

Abstract

Cross sections for elastic and inelastic scattering of the weakly-bound 9 Be nucleus on a 120 Sn target have been measured at seven bombarding energies around and above the Coulomb barrier. The elastic angular distributions are analyzed with a four-body continuum-discretized coupled-channels (CDCC) calculation, which considers 9 Be as a three-body projectile (α + α + n). An optical model analysis using the São Paulo potential is also shown for comparison. The CDCC analysis shows that the coupling to the continuum part of the spectrum is important for the agreement with experimental data even at energies around the Coulomb barrier, suggesting that breakup is an important process at low energies. At the highest incident energies, two inelastic peaks are observed at 1.19(5) and 2.41(5) MeV. Coupled-channels (CC) calculations using a rotational model confirm that the first inelastic peak corresponds to the excitation of the 2 + 1 state in 120 Sn, while the second one likely corresponds to the excitation of the 3 − 1 state.

Elastic scattering, inelastic excitation, and 1n pick-up transfer cross sections for B10 + SnÁlvarez1, Rodríguez‐Gallardo2, Gasques3 et al. 2018Phys. Rev. CSelf Cite204140View full textAdd to dashboardCite

“…On the other hand, according to our theoretical approaches, a Fresnel peak is expected at 37.5 MeV around 100 • , but without correspondence in the experimental data. A similar result has been recently reported in [33] for the elastic scattering of 9 Be on 120 Sn. In this case, the Fresnel peak is prominent in the data at E LAB = 29.5 MeV, damped at E LAB = 31 MeV, and again appears in higher energies (42 and 50 MeV).…”

Structure of 13Be probed via quasi-free scattering

“…This consists in diagonalizing the Hamiltonian in an analytical transformed harmonic oscillator (THO) basis for three-body systems. The method has been previously applied with great success to describe direct reactions induced by three-body projectiles [22,[42][43][44].…”

Global study of Be9 + p at 2.72A MeV

“…Within this framework, continuum states are obtained by diagonalizing the three-body Hamiltonian in a THO basis, and may contain resonant and nonresonant components. The method has been previously applied to 9 Be-induced reactions on heavier targets [42,43]. In the present case, we need p- 4 He and p-n potentials to generate the corresponding form factors.…”

“…For that the CDCC formalism was extended to a four-body formalism in a transformed harmonic oscillator framework (THO) [6,40,41]. The new formalism has been successfully applied to several reactions induced by 9 Be [42,43]. Within the present study, we have to face an additional challenge, moving at a very low energy regime, where breakup is expected to be small and coupling mechanisms to other reaction channels may prove to be important [20].…”