POTENTIALS BY INVERSION OF HE-3 PLUS ALPHA-PHASE SHIFTS AND BOUND-STATE ENERGIES IN BE-7

A method is introduced to determine a potential by inversion from both bound state energies and phase shifts, based upon the iterative pertu rbative S matrix to potential inversion procedure. The method is appli ed to determine the local potential reproducing low-energy He-3 + alph a phase shifts as well as the l = 1 bound states and lowest l = 3 reso nances in Be-7, for both the single channel RGM and empirical data. An even-parity potential is determined from phase shifts up to l = 4, wh ich differs significantly from the shape of the odd-parity term. The n eed for a pronounced parity-dependent potential underlying the RGM is confirmed, which strongly resembles that found in both alpha + p and a lpha + C-12 scattering.