Dependence of S-Process Nucleosynthesis in Massive Stars on Triple-Alpha and 12C(a,g)16O Reaction Rate Uncertainties

Abstract

We have studied the sensitivity of s-process nucleosynthesis in massive stars to +/- 2 sigma variations in the rates of the triple alpha and 12C(a,g)16O reactions. We simulated the evolution of massive stars from H-burning through Fe-core collapse, followed by a supernova explosion. We found that: the production factors of s-process nuclides between 58Fe and 96Zr change strongly with changes in the He burning reaction rates; using the Lodders (2003) solar abundances rather than those of Anders and Grevesse (1989) reduces s-process nucleosynthesis; later burning phases beyond core He burning and the shell C burning have a significant effect on post-explosive production factors. We also discuss the implications of the uncertainties in the helium burning rates for evidence of a new primary neutron capture process (LEPP) in massive stars.

arXiv commentSubmitted to the Astrophysical Journal

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Cited by in corpus (36)

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• NuGrid stellar data set I. Stellar yields from H to Bi for stars with metallicities Z = 0.02 and Z = 0.01
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• The s-process in the Galactic halo: the fifth signature of spinstars in the early Universe?
• Production of 26Al, 44Ti, and 60Fe in Core-Collapse Supernovae: Sensitivity to the Rates of the Triple Alpha and 12C(a,g)16O Reactions
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• The effect of 12C + 12C rate uncertainties on the evolution and nucleosynthesis of massive stars
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• Uncertainties in Galactic Chemical Evolution Models
• Uncertainties in s-process nucleosynthesis in massive stars determined by Monte Carlo variations
• Neutron capture cross section of unstable 63Ni: implications for stellar nucleosynthesis
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• Code dependencies of pre-supernova evolution and nucleosynthesis in massive stars: Evolution to the end of core helium burning
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• Effective Helium Burning Rates and the Production of the Neutrino Nuclei
• Reducing Uncertainties in the Production of the Gamma Emitting Nuclei 26Al, 44Ti, and 60Fe in Core Collapse Supernovae by Using Effective Helium Burning Rates
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• Effects of Triple-$\alpha$ and ${}^{12}\mathrm{C}(\alpha ,\gamma {)}^{16}\mathrm{O}$ Reaction Rates on the Supernova Nucleosynthesis in a Massive Star of 25 $M_{\odot }$
• Convective overshooting and production of s-nuclei in massive stars during their core He-burning phase
• Signature of a massive rotating metal-poor star imprinted in the Phoenix stellar stream
• Chromium Nucleosynthesis and Silicon-Carbon Shell Mergers in Massive Stars
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• Effects of a New Triple-α Reaction on the S-process in Massive Stars
• The impact of new ($\alpha$, n) reaction rates on the weak s-process in metal-poor massive stars
• Progenitors of Core-Collapse Supernovae