Direct and compound-nucleus reaction mechanisms in theBe7+Ni58system at near-barri

Abstract

The energy and angular distributions of 3 He and 4 He ions produced in the 7 Be + 58 Ni reaction at a bombarding energy of 22 MeV have been measured for the first time. The yield of the heavier helium isotope was four to five times more abundant than that of its lighter counterpart, ruling out the possibility that in this energy range the 7 Be reaction dynamics is dominated by the exclusive breakup process 7 Be → 3 He + 4 He (S α = 1.586 MeV). Extensive kinematic and theoretical calculations suggest that the 3 He ions mostly originate from the 4 He-stripping process and the 4 He production is mainly triggered by the fusion-evaporation channel. The role played by the breakup, 3 He-stripping, 1n-stripping, and 1n-pickup processes is also discussed.

Interaction of He8 with Pb208 at near-barrier energies: HeMarquínez-Durán1, Martel2, Sánchez-Benítez3 et al. 2018Phys. Rev. CSelf Cite10020View full textAdd to dashboardCite

“…Monte Carlo calculations of the 6 He angular distribution, similar to those performed in Ref. [17] for the single-neutron stripping and pickup reactions in the 7 Be + 58 Ni system, using the calculated 7 He angular distributions as input confirm this. The mean values of the summed integrated cross sections are given in Table I with uncertainties indicating the range covered by the use of the different exit channel potentials.…”

Elastic scattering of Be7+Si28 at near-barrier energies

“…This beam has been produced regularly at the EXOTIC facility for several years now and a comprehensive description of the beam is given in Ref. [44]. Details pertinent to this work are given below.…”

Ελαστική σκέδαση και μηχανισμοί αντιδράσεων κοντά στο φράγμα Coulomb για το σύστημα 7Be+28Si

“…Therefore, taking into account that according to CDCC calculations, which described in a very good way the elastic scattering data, the contribution of the breakup channel is small, we can say that the bulk of the 3 He production is attributed to 4 He stripping. This is consistent with previous data concerning the 7 Be+ 58 Ni system [67] and it seems to be a more general property of reactions involving weakly bound nuclei presenting a cluster structure. For example, in Ref.…”

“…Exclusive measurements have been reported, mainly for stable weakly bound projectiles, e.g., 6 Li on 28 [51,58]. Relevant inclusive measurements for stable [59][60][61][62] as well as radioactive projectiles [34,40,[63][64][65][66][67] display significant contributions from direct channels including breakup.…”