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This study was motivated by recent suggestions that nuclear decay rates may be affected by solar activity, perhaps arising from solar neutrinos. If this were the case then the $\\beta$-decay rates, or half-lives, of a thin foil sample and a spherical sample of gold of the same mass and activity could be different. We find for \\Au{198}, $(T_{1/2})_{\\rm foil}/(T_{1/2})_{\\rm sphere} = 0.999 \\pm 0.002$, where $T_{1/2}$ is the mean half-life. 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Yue, D. E. Krause, E. Fischbach, G. L. Greene, J. B. Buncher, J. H. Jenkins, J. J. Mattes, R. M. Lindstrom","submitted_at":"2010-06-25T21:10:24Z","abstract_excerpt":"We report the results of an experiment to determine whether the half-life of \\Au{198} depends on the shape of the source. This study was motivated by recent suggestions that nuclear decay rates may be affected by solar activity, perhaps arising from solar neutrinos. If this were the case then the $\\beta$-decay rates, or half-lives, of a thin foil sample and a spherical sample of gold of the same mass and activity could be different. We find for \\Au{198}, $(T_{1/2})_{\\rm foil}/(T_{1/2})_{\\rm sphere} = 0.999 \\pm 0.002$, where $T_{1/2}$ is the mean half-life. 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