ENERGY-DEPENDENT INVERSION OF P-16 SCATTERING DATA(O)

A fast iterative procedure is developed to determine potentials by inv ersion from elastic cross section, analysing powers and reaction cross -section measurements covering a wide energy range. The procedure inco rporates both energy and parity dependence. The method is applied to e xtensive p + O-16 scattering data for an energy range from 27.3 to 46. 1 MeV, giving a solution which simultaneously reproduces the data at a ll energies. The wide angle data is well reproduced by including parit y dependence and a linear energy dependence is established for the rea l potential, including the parity-dependent component. The real terms agree qualitatively with potentials derived from the single channel RG M, but the central and spin-orbit imaginary components have distinct f eatures strongly suggestive of further non-local contributions, possib ly arising from channel coupling. The large data set is found essentia l to reduce the potential ambiguities present when fitting scattering data. (C) 1997 Elsevier Science B.V.