The 12C + 12C reaction and the impact on nucleosynthesis in massive stars

Abstract

Despite much effort in the past decades, the C-burning reaction rate is uncertain by several orders of magnitude, and the relative strength between the different channels 12C(12C,alpha)20Ne, 12C(12C,p)23Na and 12C(12C,n)23Mg is poorly determined. Additionally, in C-burning conditions a high 12C+12C rate may lead to lower central C-burning temperatures and to 13C(alpha,n)16O emerging as a more dominant neutron source than 22Ne(alpha,n)25Mg, increasing significantly the s-process production. This is due to the rapid decrease of the 13N(gamma,p)12C with decreasing temperature, causing the 13C production via 13N(beta+)13C. Presented here is the impact of the 12C+12C reaction uncertainties on the s-process and on explosive p-process nucleosynthesis in massive stars, including also fast rotating massive stars at low metallicity. Using various 12C+12C rates, in particular an upper and lower rate limit of ~ 50000 higher and ~ 20 lower than the standard rate at 5*10^8 K, five 25 Msun stellar models are calculated. The enhanced s-process signature due to 13C(alpha,n)16O activation is considered, taking into account the impact of the uncertainty of all three C-burning reaction branches. Consequently, we show that the p-process abundances have an average production factor increased up to about a factor of 8 compared to the standard case, efficiently producing the elusive Mo and Ru proton-rich isotopes. We also show that an s-process being driven by 13C(alpha,n)16O is a secondary process, even though the abundance of 13C does not depend on the initial metal content. Finally, implications for the Sr-peak elements inventory in the Solar System and at low metallicity are discussed.

References in corpus (48)

• Mass-loss predictions for O and B stars as a function of metallicity
• Low Temperature Opacities
• Nucleosynthesis in Massive Stars With Improved Nuclear and Stellar Physics
• Astrophysical Reaction Rates From Statistical Model Calculations
• Neutron capture in low mass Asymptotic Giant Branch stars: cross sections and abundance signatures
• Galactic Chemical Evolution: Hydrogen Through Zinc
• Nucleosynthesis Yields of Core-Collapse Supernovae and Hypernovae, and Galactic Chemical Evolution
• Shell-model calculations of stellar weak interaction rates: II. Weak rates for nuclei in the mass range A=45-65 in supernovae environment
• Galactic Evolution of Sr, Y, Zr: A Multiplicity of Nucleosynthetic Processes
• Nucleosynthetic signatures of the first stars
• Presupernova Evolution of Rotating Massive Stars II: -- Evolution of the Surface Properties
• The nucleosynthesis of Al26 and Fe60 in solar metallicity stars extending in mass from 11 to 120 Msun: the hydrostatic and explosive contributions
• The early star generations: the dominant effect of rotation on the CNO yields
• Where, oh where has the r-process gone?
• Stellar evolution with rotation XII: Pre-supernova models
• Hindrance of heavy-ion fusion due to nuclear incompressibility
• S-factor of 14N(p,gamma)15O at astrophysical energies
• Neutron-capture elements in the very metal-poor star HD122563
• Towards Realistic Progenitors of Core-Collapse Supernovae
• Charged-Particle and Neutron-Capture Processes in the High-Entropy Wind of Core-Collapse Supernovae
• Production of Light Element Primary Process nuclei in neutrino-driven winds
• Non-standard s process in low metallicity massive rotating stars
• The s process in massive stars at low metallicity. Effect of primary N14 from fast rotating stars
• Study of the 12C+12C fusion reactions near the Gamow energy
• Massive Stars in the Range $13-25{\mathrm{M}}_{\odot }$: Evolution and Nucleosynthesis. II. the Solar Metallicity Models
• Type Ia Supernovae as Sites of p-process: Two-Dimensional Models Coupled to Nucleosynthesis
• Sensitivity of p-Process Nucleosynthesis to Nuclear Reaction Rates in a 25 Solar Mass Supernova Model
• Nucleosynthesis in the Early Galaxy
• White dwarf spins from low mass stellar evolution models
• Nuclear fusion in dense matter: Reaction rate and carbon burning
• Probing the Neutron-Capture Nucleosynthesis History of Galactic Matter
• Integrated Nucleosynthesis in Neutrino Driven Winds
• s-Process Nucleosynthesis in Advanced Burning Phases of Massive Stars
• Branchings in the gamma-process path revisited
• The s-Process in Rotating Asymptotic Giant Branch Stars
• 26Al and 60Fe From Supernova Explosions
• The 12C(alpha,gamma)16O Reaction Rate and the Evolution of Stars in the Mass Range 0.8 < M/M(sun) < 25
• Nucleosynthesis Modes in the High-Entropy-Wind of Type II Supernovae: Comparison of Calculations with Halo-Star Observations
• The effect of 12C + 12C rate uncertainties on the evolution and nucleosynthesis of massive stars
• Models for Massive Stellar Populations with Rotation
• BRUSLIB and NETGEN: the Brussels nuclear reaction rate library and nuclear network generator for astrophysics
• Evolution of Massive Stars Up to the End of Central Oxygen Burning
• Production of the p-Process Nuclei in the Carbon-Deflagration Model for Type Ia Supernovae
• The puzzle of the synthesis of the rare nuclide 138La
• Spectra and Light Curves of Failed Supernovae
• Constraints on rotational mixing from surface evolution of light elements in massive stars
• Nucleosynthesis in Neutrino-Driven Supernovae
• Massive Star Evolution: Nucleosynthesis and Nuclear Reaction Rate Uncertainties

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