Systematics of fusion barriers obtained with a modified proximity potential

A systematic semiempirical analysis is presented for excitation functions for complete fusion of complex nuclei. Barrier penetration is included as is the $l$ dependence of the fusion radius. The general form of the proximity potential is assumed and small but important parameter adjustments are made to achieve a fit to experimental data. A correction is presented of $s$-wave barrier heights and radii for complete fusion. For $Z_t{Z}_p<500\mathrm{}$ these fusion radii are greater than the empirical reaction radii obtained at energies well above the barrier. This result implies weak surface absorption for $Z_t{Z}_p<500\mathrm{}$ and the contrary for higher $Z_t{Z}_p$.