Elastic scattering and fusion cross sections forBe7,Li7

Abstract

Quasi-elastic-scattering and transfer reaction cross-section measurements were made for the 7 Be + 27 Al system at E lab = 17, 19, and 21 MeV in the angular range θ c.m. = 12 • −43 • . An optical model (OM) analysis of the quasi-elastic scattering data was carried out. The fusion cross sections were derived at these energies by subtraction of the integrated transfer cross sections from the reaction cross sections obtained from the fits to quasi-elastic-scattering data. These fusion cross sections were found to be consistent with those obtained from the coupled-channels calculations. Elastic scattering and fusion cross sections were measured for the 7 Li + 27 Al system at E lab = 10, 13, 16, 19, and 24 MeV. For elastic scattering the angular coverages were in the θ lab = 12 • −72 • range and for fusion the α-evaporation spectra from the compound nucleus were measured in the angular range θ lab = 52 • −132 • (142 • at 10 MeV). The elastic-scattering angular distributions were subjected to OM analysis. The α-evaporation spectra were reproduced with the statistical model calculations, and the fusion cross sections were extracted from them. The fusion cross sections were also extracted by subtraction of the integrated inelastic-scattering cross sections from the reaction cross sections obtained from the OM fits to the elastic-scattering data, and these fusion data were found to be consistent. The CCDEF calculations describe these data quite well. A comparison of the fusion data for the 7 Be + 27 Al and 7 Li + 27 Al systems shows a similar and consistent behavior.

Elastic scattering and total reaction cross section for theBe7+Al27system at near-barrier energies

“…For 7 Be + 27 Al from Ref. [30] we assumed error bars of the order of 8%, similar to the ones reported by Benjamim for 6 He [10].…”

“…Data are from [10,21,22,28,29]. We also show data for the 7 Be + 27 Al system obtained at higher energies than ours (E lab = 17, 19, and 21 MeV) [30]. The reduction method used was the one proposed in Ref.…”

Recent developments in fusion and direct reactions with weakly bound nuclei

“…Kalita et al [385] determined TF fusion cross sections in collisions of 7 Be and 7 Li projectiles on 27 Al, using an indirect procedure. Their experiments were performed at the HIRA-RIB facility at IUCC, New Delhi.…”

FOLDING MODEL ANALYSIS OF 6He+120Sn ELASTIC SCATTERING

“…In recent years, reactions induced by these exotic nuclei on a range of targets have been studied in the energy region around and well above the Coulomb barrier. [2][3][4][5][6][7][8] Nuclear reactions induced by exotic nuclei are expected to show new effects in their reaction for energies around the Coulomb barrier, where couplings between the entrance channel and the continuum, as well as to the various reaction channels are expected to be very important. 4 In addition, the data on reactions induced by exotic nuclei are of particular interest and provide valuable information for understanding the astrophysical reactions.…”

“…4 In addition, the data on reactions induced by exotic nuclei are of particular interest and provide valuable information for understanding the astrophysical reactions. 2 Information about the charge, matter, current and momentum distributions of stable isotopes usually has been provided through the scattering of particles and ions from nuclei. Heavy-ion elastic-scattering reactions have been a major source of such information beside the information about the properties of nucleus-nucleus (NN) interactions.…”