Near- and sub-barrier fusion of theBe7+Ni58system

Abstract

Evaporation proton yields were measured for the fusion of the radioactive proton-rich nucleus 7 Be onto a 58 Ni target at six near-barrier energies. Total fusion cross sections were deduced by using calculated proton multiplicities. The resulting fusion excitation function shows a considerable enhancement with respect to calculations for a bare potential, even for energies above the Coulomb barrier. Inelastic couplings can account for the enhancement at the highest energy. Total fusion channels nearly saturate the total reaction cross section in the measured energy region. Comparison with previous results scaled appropriately for 7 Be + ( 27 Al, 238 U) shows good agreement.

Sub-barrier fusion of weakly bound Li6 with Ni58

“…The details of the corresponding procedure have been described in Ref. [18]. It was determined that the presence of background protons in the data was insignificant in the present case, with typical contributions around 1%.…”

“…Additional details concerning the 7 Be + 58 Ni radioactive beam measurements were given in Ref. [18]. Specific details related to the 6 Li data are described here.…”

Recent developments in fusion and direct reactions with weakly bound nuclei

“…Recently, Martinez-Quiroz et al [354] measured the TF cross section for the 7 Be + 58 Ni system. The experiment was performed at Notre Dame, using the proton multiplicity method.…”

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

“…The elastic scattering process for the 7 Be + 58 Ni system was measured at five energies around the Coulomb barrier in an experiment performed with the Twinsol [25] facility at the University of Notre Dame (USA) with a 8 B, 7 Be, 6 Li "cocktail" beam [21]. More recently, the fusion cross section for the same system was deduced from a measurement of the proton (evaporation) cross section at backward angles [26]. The elastic scattering angular distributions and the fusion excitation function were simultaneously fitted [27] using a theoretical approach consisting of splitting the dynamical polarization potential into two parts: the first related to the coupling between the elastic channel and the fusion process and the second corresponding to the couplings with direct reaction channels.…”