Fusion cross sections for 12C+128Te and the deduction of absolute average angular momenta.

Abstract

Fusion cross sections have been measured for $^{12}\mathrm{C}$${+}^{128}$Te from ${\mathit{E}}_{\mathrm{c}.\mathrm{m}.}$=40.4 to 56.6 MeV by direct detection and identification of evaporation residues using a time-of-flight technique. Average angular momenta for fusion are deduced from a sharp cutoff approximation at energies above the Coulomb barrier. These values of 〈l〉 and those already obtained from isomer ratio measurements are in very good agreement in the energy region where both methods should be valid.