oulomb-nuclear dynamics in the breakup of the weakly bound Li-8 nucleu

Autor(es)

Mukeru, B. ^[1] ; Lubian, J. ^[2] ; Tomio, Lauro ^[3]

Afiliação do(s) autor(es)

^[1] Univ South Africa, Dept Phys, POB 392, ZA-0003 Pretoria - South Africa

^[2] Univ Fed Fluminense, Inst Fis, Ave Litoranea S-N, BR-24210340 Niteroi, RJ - Brazil

^[3] Univ Estadual Paulista, Inst Fis Teor, BR-01140070 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Physical Review C; v. 105, n. 2 FEB 4 2022.
• Citações Web of Science: 0

Resumo

A detailed study of total, Coulomb, and nuclear breakup cross sections dependence on the projectile groundstate binding energy epsilon(b) is presented by considering the Li-8 + C-12 and Li-8 + Pb-208 breakup reactions. To this end, apart from the experimental one-neutron separation energy of Li-8 nucleus (epsilon(b) = 2.03 MeV), lower values of epsilon(b) down to epsilon(b) = 0.01 MeV, are also being considered. It is shown that all breakup processes become peripheral as epsilon(b) -> 0.01 MeV, which is understood as due to the well-known large spacial extension of ground-state wave functions associated to weakly bound projectiles. The Coulomb breakup cross section is found to be more strongly dependent on epsilon(b) than the nuclear breakup cross section, such that the Coulomb breakup becomes more significant as epsilon(b) decreases, even in a naturally nuclear-dominated reaction. This is mainly due to the long-range nature of the Coulomb forces, leading to a direct dependence of the Coulomb breakup on the electromagnetic transition matrix. It is also highlighted the fact that the nuclear absorption plays a minor role for small binding when the breakup becomes more peripheral. (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