Two specific examples of electromagnetic transitions are used to demonstrate the ability of the macroscopic potentials determined from an iterative-perturbative inversion to reproduce the results of the microscopic resonating-group method (RGM). Phase shifts and bound state energies from a single-configuration microscopic resonating-group method calculation for ${}_{}{}^3{}_{}{}^{}\mathrm{He}$+α have been used to construct a potential model for the ${}_{}{}^3{}_{}{}^{}\mathrm{He}$(α,γ${)}^7$Be electric-dipole capture reaction. With this potential model the astrophysical S factor at zero energy deviates from the resonating-group method result by just 3%. A potential model for the α+α bremsstrahlung cross section, similarly constructed from α+α resonating-group phase shifts, gives good agreement with the RGM cross section.

• Received 21 November 1994

DOI:https://doi.org/10.1103/PhysRevC.51.2268