Treatment of isomers in nucleosynthesis codes

Abstract

The decay properties of long-lived excited states (isomers) can have a significant impact on the destruction channels of isotopes under stellar conditions. In sufficiently hot environments, the population of isomers can be altered via thermal excitation or de-excitation. If the corresponding lifetimes are of the same order of magnitude as the typical time scales of the environment, the isomers have to be the treated explicitly. We present a general approach to the treatment of isomers in stellar nucleosynthesis codes and discuss a few illustrative examples. The corresponding code is available online at http://exp-astro.de/isomers/

arXiv comment24 pages, 19 figures

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• Effective Stellar $\beta$-Decay Rates of Nuclei with Long-lived Isomers: ${}^{26}$Al and ${}^{34}$Cl
• Alpha decay law of excited nuclei and its role in stellar decay rates
• Neutron transfer reactions on the ground state and isomeric state of a 130Sn beam
• How Do Nuclear Isomers Influence the Gamma-Ray Bursts in Binary Neutron Star Mergers?
• Impact of $\text{T}$- and $\rho$-dependent decay rates and new (n,$\gamma$) cross sections on the $\text{s}$ process in low-mass AGB stars
• Sensitivity of Neutron-Rich Nuclear Isomer Behavior to Uncertainties in Direct Transitions