Alpha particle production by molecular single-particle effect in reactions of ${}^9$Be just above the Coulomb barrier

Abstract

The $\alpha$-particle production in the dissociation of ${}^9$Be on ${}^{209}$Bi and ${}^{64}$Zn at energies just above the Coulomb barrier is studied within the two-center shell model approach. The dissociation of ${}^9$Be on ${}^{209}$Bi is caused by a molecular single-particle effect (Landau-Zener mechanism) before the nuclei reach the Coulomb barrier. Molecular single-particle effects do not occur at that stage of the collision for ${}^9$Be+${}^{64}$Zn, and this explains the absence of fusion suppression observed for this system. The polarisation of the energy level of the last neutron of ${}^9$Be and, therefore the existence of avoided crossings with that level, depends on the structure of the target.

arXiv comment5 pages, 4 figures

References in corpus (3)

• Fusion versus Breakup: Observation of Large Fusion Suppression for ^9Be + ^{208}Pb
• Effect of continuum couplings in fusion of halo ${}^{11}$Be on ${}^{208}$Pb around the Coulomb barrier
• Role of break-up processes in fusion enhancement of drip-line nuclei at energies below the Coulomb barrier

Cited by in corpus (6)

• How does breakup influence the total fusion of ${}^{6,7}$Li at the Coulomb barrier?
• Relating breakup and incomplete fusion of weakly-bound nuclei through a classical trajectory model with stochastic breakup
• Modelling incomplete fusion dynamics of weakly-bound nuclei at near-barrier energies
• Solving the two-center nuclear shell-model problem with arbitrarily-orientated deformed potentials
• Effects of unconventional breakup modes on incomplete fusion of weakly bound nuclei
• Tracing the dynamical interplay of low-energy reaction processes of exotic nuclei using a two-center molecular continuum