Total reaction cross sections from $^{141}$141Pr($\alpha$,$\alpha$)$^{141}$Pr elastic scattering and $\alpha$-induced reaction cross sections at low energies

摘要

Elastic scattering data for $^{141}$Pr($\alpha$,$\alpha$)$^{141}$Pr have beenanalyzed to derive a new energy-dependent local potential for the$^{141}$Pr-$\alpha$ system. This potential is used successfully to predict thecross section of the $^{141}$Pr($\alpha$,n)$^{144}$Pm reaction at low energieswhere new experimental data have become available very recently. Contrary tovarious global potentials, this new potential is able to reproducesimultaneously elastic scattering data around and above the Coulomb barrier andreaction data below the Coulomb barrier for the $^{141}$Pr-$\alpha$ system.Reasons for the partial failure of the global potentials are explained byintrinsic properties of the scattering matrix and their variation with energy.The new local potential may become the basis for the construction of a newglobal $\alpha$-nucleus potential.