Extended Optical Model Analyses of Elastic Scattering, Direct Reaction, and Fusion Cross Sections for the 9Be + 208Pb System at Near-Coulomb-Barrier Energies

Abstract

Based on the extended optical model approach in which the polarization potential is decomposed into direct reaction (DR) and fusion parts, simultaneous ${\chi }^2$ analyses are performed for elastic scattering, DR, and fusion cross section data for the ${}^9$Be+${}^{208}$Pb system at near-Coulomb-barrier energies. Similar ${\chi }^2$ analyses are also performed by only taking into account the elastic scattering and fusion data as was previously done by the present authors, and the results are compared with those of the full analysis including the DR cross section data as well. We find that the analyses using only elastic scattering and fusion data can produce very consistent and reliable predictions of cross sections particularly when the DR cross section data are not complete. Discussions are also given on the results obtained from similar analyses made earlier for the ${}^9$Be+${}^{209}$Bi system.

Comments: 5 figures