The End of Nucleosynthesis: Production of Lead and Thorium in the Early Galaxy

Ian U. Roederer, Karl-Ludwig Kratz, Anna Frebel +4

We examine the Pb and Th abundances in 27 metal-poor stars (-3.1 < [Fe/H] < -1.4) whose very heavy metal (Z > 56) enrichment was produced only by the rapid (r-) nucleosynthesis pro…