On the near-barrier fusion of the proton-halo 8B + 58Ni system

Abstract

We have performed two independent calculations, without any free parameter, to predict the near-barrier fusion cross section for the proton-halo 8B + 58Ni system, for which data were recently reported. Standard coupled channel calculations predict fusion cross sections smaller than the data, while CDCC calculations for the absorption cross section (fusion + transfer + inelastic cross sections) agree with the data above the barrier, although transfer cross sections are calculated to have non-negligible cross section at this energy regime. At sub-barrier energies, region where transfer cross sections are particularly important, the CDCC calculations overpredict the data. The fusion data of the 8B + 58Ni system fail to follow the systematics of other weakly bound nuclei and the UFF curve and do not agree with the fusion data of the 8B + 28Si system. We try to explain this anomalous behaviour.