Europium Isotope Ratios in s-Process Element-enhanced Metal-poor Stars: A new probe of the 151 Sm branching
We report on the first measurement of the Eu isotope fractions ( 151Eu and 153Eu) in s-process element-enhanced metal-poor stars. We use these ratios to investigate the 151Sm branching of s-process nucleosynthesis. The measurement was made by detailed study of Eu II lines that are significantly affected by hyperfine splitting and isotope shifts in spectra of the carbon-rich very metal poor stars LP 625-44 and CS 31062-050, observed with the Subaru Telescope High Dispersion Spectrograph. The...[Show more]
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|Source:||Astrophysical Journal, The|
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