Effective potentials and threshold anomaly

The strong E and L dependence of the effective elastic channel potentials is shown to be an implicit radial kinetic energy (ε) dependence. It is also shown that this effective potential satisfies the dispersion relation in ε variable at the strong absorption radius. Further, the experimental data for both elastic and fusion channels are consistent with this L-dependence of the corresponding effective potentials. The effective transfer channel potentials derived using CRC code FRESCO are shown to exhibit strong energy dependence as a result of couplings. The energy dependence of effective transfer strength for 16O+208Pb and 16O+ 232Th system is determined using the experimental transfer angular distributions. (author). 19 refs., 6 figs., 4 tabs