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- W3108505744 abstract "Abstract Certain nuclear isomers are well known to affect nucleosynthesis with important observable consequences (e.g., 26 Al and 180 Ta). We study the impact of nuclear isomers in the context of rapid neutron capture process ( r -process) nucleosynthesis. We demonstrate that nuclear isomers are dynamically populated in the r process and that some are populated far from thermal equilibrium; this makes them astrophysical isomers, or “astromers.” We compute thermally mediated transition rates between long-lived isomers and the corresponding ground states in neutron-rich nuclei. We calculate the temperature-dependent β -decay feeding factors, which represent the fraction of material going to each of the isomer and ground state daughter species from the β -decay parent species. We simulate nucleosynthesis following the decay of a solar-like r -process composition and include as separate species nuclear excited states with measured terrestrial half-lives greater than 100 μ s. We introduce a new metric to identify those astromers most likely to be influential and summarize them in a table. Notable entries include many second peak nuclei (e.g., the Te isotopic chain) and previously overlooked isomers in stable nuclei (e.g., 119 Sn, 131 Xe, and 195 Pt). Finally, we comment on the capacity of isomer production to alter radioactive heating in an r -process environment." @default.
- W3108505744 created "2020-12-07" @default.
- W3108505744 creator A5001690676 @default.
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- W3108505744 date "2021-05-01" @default.
- W3108505744 modified "2023-10-17" @default.
- W3108505744 title "Astromers in the Radioactive Decay of r-process Nuclei" @default.
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- W3108505744 doi "https://doi.org/10.3847/2041-8213/abfb74" @default.
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