THE C-12-24 ELASTIC-SCATTERING - AN EXAMPLE OF ANOMALOUS TRANSPARENCYAT COULOMB BARRIER ENERGIES(MG)

Fifteen complete angular distributions of the elastic scattering of C- 12+Mg-24 were measured at energies around the Coulomb barrier (E-cm = 10.67-16 MeV). The angular distributions are strongly oscillating and could be well described by an optical potential family, whose real par t was determined without continuous ambiguity. The imaginary part of t his optical potential is very shallow. At four energies the inelastic scattering angular distributions leading to the 2(+) state of the Mg-2 4 were also measured and analysed with coupled-channels calculations. The volume integrals of the optical potentials used in the coupled-cha nnels calculations present the threshold anomaly in their energy depen dence, with a clear Q-value dependence. (C) 1997 Elsevier Science B.V.