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For the determination of the $^{144}Sm-\alpha$ optical potential we measuredthe angular distribution of $^{144}Sm(\alpha,\alpha)^{144}Sm$ scattering at theenergy $E_{lab} = 20 MeV$ 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 $E_{c.m.} = 9.5 MeV$with very limited uncertainties.Comment: 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.u

physical review. c. nuclear physics/physical review. c, nuclear physics

<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>144</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>Sm-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi></mml:math>optical potential at astrophysically relevant energies derived from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>144</mml:mn></mml:mrow…

144Sm-αoptical potential at astrophysically relevant energies derived from144