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Stellar production rates of carbon and its abundance in the universe

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arxiv astro-ph/0007178 v1 pith:FZNAQ6CF submitted 2000-07-13 astro-ph hep-phnucl-th

Stellar production rates of carbon and its abundance in the universe

Heinz Oberhummer (Vienna University of Technology) , Attila Csoto (Eotvos University , Budapest) , Helmut Schlattl (Max-Planck Institute for Astrophysics , Garching) This is my paper
classification astro-ph hep-phnucl-th
keywords carbonstellarmodelproductionratesreactiontriple-alphauniverse
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The bulk of the carbon in our universe is produced in the triple-alpha process in helium-burning red giant stars. We calculated the change of the triple-alpha reaction rate in a microscopic 12-nucleon model of the C-12 nucleus and looked for the effects of minimal variations of the strengths of the underlying interactions. Stellar model calculations were performed with the alternative reaction rates. Here, we show that outside a narrow window of 0.5 and 4% of the values of the strong and Coulomb forces, respectively, the stellar production of carbon or oxygen is reduced by factors of 30 to 1000.

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  1. Fine-tunings in radiative $\alpha$-particle capture on $^{12}$C at astrophysical energies

    nucl-th 2026-01 unverdicted novelty 4.0

    Astrophysical S-factor data constrain variations in the electromagnetic fine-structure constant to |δ α/α| ≤ 0.0002 in radiative alpha capture on carbon-12.