Fusion cross sections for 6Li+12C and 6Li+13C reactions at low energies

The partial cross sections for the Li-6+C-12 and Li-6+C-13 reactions below and above the Coulomb barrier energy have been determined from the cross sections of the characteristic gamma-rays measured with HPGe detectors and using the branching factor sigma(gamma)/sigma(ch) obtained from the statistical model calculations. The fusion cross sections obtained from the sum of these partial cross sections are found to be equal to the total reaction cross sections upto an energy well above the Coulomb barrier energy and there appears to be no evidence for limitation of fusion cross sections for these systems at such energies contrary to the evaporation residue measurements. The measured cross sections are also found to agree nicely with the IWBC (Incoming Wave Boundary Condition) and one-dimensional BPM (Barrier Penetration Model) calculation. (C) 1998 Elsevier Science B.V.