Weakly bound halo breakup of neutron-Li-7 and nucleon-Be-7 on a lead target

Autor(es)

Mukeru, B. ; Frederico, T. ; Tomio, Lauro

• Tipo de documento: Artigo Científico
• Fonte: PHYSICAL REVIEW C; v. 102, n. 6, p. 13-pg., 2020-12-28.

Resumo

A comparative analysis of the breakup cross-sections, using continuum discretized coupled-channel approach, is presented for the weakly bound p-wave neutron Li-7 and nucleon-Be-7 projectiles on the Pb-208 target, by investigating the role of interaction effects between the core (Li-7, Be-7) with the target. The extra charge in the B-8 has the effect to increase the Coulomb contribution in the breakup reaction channel. By fixing both projectile ground-state binding energies at 0.137 MeV (B-8 experimental one), with incident energies at the Coulomb barrier and above, we found that the charge difference accounts for over 30% of the neutron-Be-7 breakup cross sections, substantially larger than the corresponding one for proton-Be-7. The large enhancement of the neutron-halo breakup cross-section with respect to the proton-halo case shown in this work is associated to dynamical effects coming from the excitation of the projectile internal continuum due to the nucleon-target and core-target interactions, together with the widely accepted static effects coming from the long wave-function tail of the weakly bound neutron. The interplay between these dynamical and static effects in the energy spectrum of the B-8 fragments is visible, revealed by the peak of the energy distribution pushed to higher relative energies. This follows from the two-body final state interactions between the charged fragments distorted by the three-body reaction environment. (AU)

• Processo FAPESP: 17/05660-0 - Estudos teóricos da estrutura e reações de núcleos exóticos e sistemas de muitos corpos
• Beneficiário: Brett Vern Carlson
• Modalidade de apoio: Auxílio à Pesquisa - Temático