Systematics of $\alpha$--nucleus optical potentials

Abstract

Double--folded optical $\alpha$--nucleus potentials can be used to calculate elastic scattering cross sections in a wide mass-- and energy region. Because of the systematic behavior of the potential parameters we are able to obtain reliable optical potentials for astrophysically relevant reactions even without scattering data in low--energy region. As example we analyze the capture reaction ${}^{144}\mathrm{Sm}(\alpha ,\gamma ){}^{148}\text{Gd}$.

Comments: 7 pages, LaTex, 3 figures available upon request to gruen@ekpvs2.una.ac.at, IK-TUW-Preprint 9404402