The ^{144}Sm-\alpha optical potential at astrophysically relevant energies derived from ^{144}Sm(\alpha,\alpha)^{144}Sm elastic scattering

Abstract

For the determination of the ${}^{144}Sm-\alpha$ optical potential we measured the angular distribution of ${}^{144}Sm(\alpha ,\alpha {)}^{144}Sm$ scattering at the energy $E_{lab}=20MeV$ with high accuracy. Using the known systematics of $\alpha$-nucleus optical potentials we are able to derive the ${}^{144}Sm-\alpha$ optical potential at the astrophysically relevant energy $E_{c.m.}=9.5MeV$ with very limited uncertainties.

Comments: 16 pages (uses revtex), 7 figures (uses psfig), accepted for publication in PRC, uuencoded tex-files and postscript-files available at ftp://is1.kph.tuwien.ac.at/pub/ohu/Sm.uu