Comparison of woods-saxon and double-folding potentials forα-particle scattering from54Fe at 24.5 MeV

Abstract

Inelastic-scattering data are presented forα-particles of 24.5 MeV from54Fe over the range 15° to 175° in the centre-of-mass system. The real part of the optical potential is calculated microscopically using the M3Y effective interaction of Bertschet al. and the DDM3Y density-dependent interaction. Elastic scattering has been analysed by using as real part of the optical potential M3Y, DDM3Y and Woods-Saxon forms (WS), taking in all three cases as imaginary part a WS potential. To fit the data the double-folding potential needs to be normalized by a factor of ⋍1.6 for the M3Y interaction and of ⋍1.13 for the DDM3Y interaction. By the study of the invariant-point ambiguity it has been observed that there exists a zone near the strong-absorption radius in which the real potential is well defined. Inelastic scattering has been analysed by coupled-channel calculations. The transition form factors for WS and DDM3Y obtained in the framework of vibrational model have been compared.