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The $R$-Process Alliance: Actinide Abundances, Variation, and Evolution in Metal-Poor Stars
The actinides, including thorium (Th), are the heaviest observable elements synthesized in the universe, holding clues to the extremes of the astrophysical and nuclear conditions of $r$-process sites. We present Th abundances based on high-resolution spectroscopy for 47 metal-poor stars, the largest
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