Self-consistent optical potential for α-particles at low energiesM. Avrigeanu1, W. von Oertzen2, A. Obreja1, F.L. Roman1 and V. Avrigeanu1
1 "Horia Hulubei" National Institute for Physics and Nuclear Engineering, P.O. Box MG-6, 76900 Bucharest, Romania
2 Freie Universität Berlin, Fachbereich Physik, 14195 Berlin, and Hahn-Meitner-Institut, 14109 Berlin, Germany
Published online: 21 May 2008
A previous semi-microscopic analysis based on the double folding model, for the α-particle elastic scattering on A ~ 100 nuclei at energies below 32 MeV, is enlarged for medium mass nuclei up to A ~ 120 and energies below 50 MeV. The energy-dependent phenomenological imaginary part for this semi-microscopic optical model potential (OMP) was obtained, making use also of the dispersive correction to the microscopic real potential. A regional OMP parameter set for low-energy α-particles has been obtained as well for nuclei within the above-mentioned mass range. It has been proved able to describe both scattering and α-particle induced reaction data, through the statistical model analysis of most accurate data of total α-reaction cross sections for 48Ti and 51V, and (α,n) reaction cross sections for the target nuclei 45Sc, 46,48Ti, 51V, 50Cr and 54Fe and incident energies lower than 11-12 MeV.
© CEA 2008