Measurements of elastic scattering for 7Be, 7Li + 9Be systems and fusion cross sections for 7Li + 9Be system

Elastic scattering angular distributions have been measured for Be-7 + Be-9 system at E-lab = 17, 19 and 21MeV in the angular range theta(cm)=26 degrees-58 degrees, and for Li-7 + Be-9 system at E-lab= 15.75, 24 and 30MeV. An optical model (OM) analysis of these data have been carried out. For the Li-7 + Be-9 system fusion cross sections were obtained at E-lab = 15.75, 24 and 30MeV by measuring the alpha-evaporation spectra from the compound nucleus at backward angles. The measured alpha-evaporation spectra were reproduced by the statistical model calculations and fusion cross sections were extracted therefrom. The ratios of the experimental fusion cross sections to the total reaction cross sections (obtained form OM analysis) were found to be rather small. This result suggests that break-up process has a strong influence on fusion process leading to a reduction in fusion cross section.