Neutron transfer and fusion-evaporation reactions of weakly bound projectiles

D. ABRIOLA; A. ARAZI; M. AVERSA, ; M.A. CARDONA, ; E. DE BARBARÁ, ; J. DE JESÚS; T. GIUDICE, ; F. GOLLAN, ; D. HOJMAN, ; M.S. KOHEN,; G.V. MARTÍ,; A.J. PACHECO, ; B. PAES, ; D. SCHNEIDER; J. LUBIAN, ; H.O. SOLER, ; V.A.B. ZAGATTO; L.C. CHAMON,; L.R. GASQUES, ; A. LÉPINE-SZILY, ; M.E.B.A. MATOS, ; V. SCARDUELLI; R.M. ID BETAN; M.A.G. ALVAREZ, ; J.P. FERNÁNDEZ-GARCÍA,; M. RODRÍGUEZ GALLARDO

Workshop; XLIV Reunião de Trabalho sobre Física Nuclear no Brasil; 2021

Sociedad Brasileira de Fisica

Weakly bound nuclei, which may break up before reaching the fusion barrier, can have a suppression in their cross section for complete fusion at energies above the barrier, when compared to single barrier penetration models. Conversely, the breakup process can lead to an enhancement of the fusion below the barrier. Thereby, we started a broad collaboration to investigate the unsolved features, and in this presentation we will show and discussed its initial results. The first reactions studied were induced by the weakly bound projectiles 9Be and 10B on 197Au targets. Elastic and inelastic scattering, and one-neutron transfer (pickup and stripping) processes were studied by the online detection of ejected light particles over a wide range of energies around the corresponding Coulomb barrier for each system [1,2]. In addition, complete and incomplete fusion processes for these systems were studied irradiating 197Au foils together with aluminum catchers for several hours. Afterwards, the fusion-evaporation residues, almost all of them with half-lives ranging from 0,5 to 150 h, could be offline identified and counted from the target and catcher by using the beta-delayed gamma-ray detection technique. The most important channels turned to be complete fusion followed by the evaporation of 3, 4, and 5 neutrons, and incomplete fusion of an alpha particle following breakup. Neutron-transfer processes, leading to 198Au or 196Au, could also be detected at energies well below the coulomb barrier [3,4]. Similar studies, performed with 2H projectiles, were also carried out and their preliminary results will be presented. For the near future, it is planned to study the same reaction channels, but for the 12,13C + 197Au and the 6,7Li + 196Pt systems.References[1] F. Gollan et al., Nucl. Phys. A 1000,121789 (2020). [2] L.R. Gasques et al., Phys. Rev. C101, 044604 (2020) [3] F. Gollan et al., Phys. Rev. C104, 024609 (2021). [4] M. Aversa et al. Phys. Rev.C101, 044601 (2020)