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Use of Global Predictions for Beta-Decay Rates in Astrophysical Models

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Abstract

The nucleosynthesis of heavy elements is calculated for two scenarios of neutron-star merger. Various global beta-decay models, including those based on the random-phase approximation (QRPA), relativistic quasiparticle RPA (pn-RQRPA), and the finite-amplitude method (FAM), were employed in these calculations. It is shown that the application of various global models in calculations of nucleosynthesis leads to the formation of a realistic structure of the curve of abundances of chemical elements. In contrast to nucleosynthesis in the scenario of merger of equal-mass neutron stars, the formation of elements in matter of the outer crust upon the explosion of a low-mass neutron star is weakly model-dependent in the region from the first to the second peak. However, the abundance of elements depends greatly on the beta-decay model in a strong r-process. No systematic effect of the beta-decay model on the results of nucleosynthesis is revealed.

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ACKNOWLEDGMENTS

I am grateful to I.N. Borzov, Yu.S. Lutostansky, and A.V. Yudin for stimulating discussions.

Funding

The applicability of global calculations for beta-decay half-lives in the analysis of the r-process was studied under the auspices of Russian Science Foundation (grant no. 21-12-00061).

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Authors and Affiliations

  1. Moscow Institute of Physics and Technology (National Research University), Dolgoprudnyi, Russia

    I. V. Panov

  2. National Research Centre ‘‘Kurchatov Institute’’, Moscow, Russia

    I. V. Panov

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Panov, I.V. Use of Global Predictions for Beta-Decay Rates in Astrophysical Models. Phys. Atom. Nuclei 86, 173–180 (2023). https://doi.org/10.1134/S1063778823020163

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