Abstract
The angular distributions of neutrons scattered from 139La, 141Pr, Er and 209Bi were measured at incident energies from 1.5 to 3.5 MeV in 500 keV steps. The results were compared with calculations using both the spherical optical model and the coupled-channels theory. The optical-potential parameters used in both the calculations were determined from comparison of the theoretical calculations with the measured values for 209Bi. The angular distributions for 139La, 141Pr and Er calculated with the coupled-channels theory fit the experiments better than those calculated with a spherical potential, except for the case of the lowest energy for 139La and 141Pr.
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