Thermonuclear 17O(n,gamma)18O reaction rate and its astrophysical implications

Abstract

A new thermonuclear ${}^{17}$O($n$,$\gamma$)${}^{18}$O rate is derived based on a complete calculation of the direct-capture (DC) and resonant-capture contributions, for a temperature region up to 2 GK of astrophysical interest. We have firstly calculated the DC and subthreshold contributions in the energy region up to 1 MeV, and estimated the associated uncertainties by a Monte-Carlo approach. It shows that the present rate is remarkably larger than that adopted in the JINA REACLIB in the temperature region of 0.01 $\sim$ 2 GK, by up to a factor of $\sim$80. The astrophysical impacts of our rate have been examined in both $s$-process and $r$-process models. In our main $s$-process model which simulates flash-driven convective mixing in metal deficient asymptotic giant branch stars, both ${}^{18}$O and ${}^{19}$F abundances in interpulse phases are enhanced dramatically by factors of $\sim 20$--$40$ due to the new larger ${}^{17}$O($n$,$\gamma$)${}^{18}$O rate. It shows, however, that this reaction hardly affects the weak $s$-process in massive stars since the ${}^{17}$O abundance never becomes significantly large in the massive stars. For the $r$-process nucleosynthesis, we have studied impacts of our rate in both the collapsar and neutron burst models, and found that the effect can be neglected, although an interesting "loophole" effect is found owing to the enhanced new rate, which significantly changes the final nuclear abundances if fission recycling is not involved in the model, however, these significant differences are almost completely washed out if the fission recycling is considered.

arXiv comment27 pages, 28 figures

References in corpus (40)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Modules for Experiments in Stellar Astrophysics (MESA)
• Gravitational Waves and Gamma-rays from a Binary Neutron Star Merger: GW170817 and GRB 170817A
• Modules for Experiments in Stellar Astrophysics (MESA): Binaries, Pulsations, and Explosions
• Modules for Experiments in Stellar Astrophysics (MESA): Convective Boundaries, Element Diffusion, and Massive Star Explosions
• Modules for Experiments in Stellar Astrophysics (MESA): Pulsating Variable Stars, Rotation, Convective Boundaries, and Energy Conservation
• Nucleosynthesis in Massive Stars With Improved Nuclear and Stellar Physics
• Astrophysical Reaction Rates From Statistical Model Calculations
• The s Process: Nuclear Physics, Stellar Models, Observations
• Presupernova evolution and explosive nucleosynthesis of rotating massive stars in the metallicity range -3 <=[Fe/H]<= 0
• Abundances of the elements in the solar system
• On The Cosmic Origins Of Carbon And Nitrogen
• Collapsars as a major source of r-process elements
• Galactic Chemical Evolution and solar s-process abundances: dependence on the 13C-pocket structure
• Large-scale QRPA calculation of E1-strength and its impact on the neutron capture cross section
• Current Status of r-Process Nucleosynthesis
• New Nuclear Reaction Flow during r-Process Nucleosynthesis in Supernovae: Critical Role of Light Neutron-Rich Nuclei
• Radiative capture of nucleons at astrophysical energies with single-particle states
• Charged-Particle Thermonuclear Reaction Rates: I. Monte Carlo Method and Statistical Distributions
• Neutron Reactions in Astrophysics
• Neutron Capture Elements in s-Process-Rich, Very Metal-Poor Stars
• s-Process Nucleosynthesis in Advanced Burning Phases of Massive Stars
• Calculations of Maxwellian-averaged Cross Sections and Astrophysical Reaction Rates Using the ENDF/B-VII.0, JEFF-3.1, JENDL-3.3 and ENDF/B-VI.8 Evaluated Nuclear Reaction Data Libraries
• Carbon-Enhanced Metal-Poor Stars. III. Main-Sequence Turn-Off Stars from the SDSS/SEGUE Sample
• Databases and tools for nuclear astrophysics applications BRUSsels Nuclear LIBrary (BRUSLIB), Nuclear Astrophysics Compilation of REactions II (NACRE II) and Nuclear NETwork GENerator (NETGEN)
• RADCAP: a potential model tool for direct capture reactions
• Relative contributions of the weak, main and fission-recycling r-process
• Neutron Thermal Cross Sections, Westcott Factors, Resonance Integrals, Maxwellian Averaged Cross Sections and Astrophysical Reaction Rates Calculated from Major Evaluated Data Libraries
• Beryllium and Alpha-Element Abundances in a Large Sample of Metal-Poor Stars
• Sensitivity of r-Process Nucleosynthesis to Light-Element Nuclear Reactions
• Charged-Particle Thermonuclear Reaction Rates: IV. Comparison to Previous Work
• Long-Term Evolution of Slowly Rotating Collapsar in Special Relativistic Magnetohydrodynamics
• Carbon-Enhanced Metal-Poor Stars. Osmium and Iridium Abundances in the Neutron-Capture-Enhanced Subgiants CS31062-050 and LP625-44
• Reaction rates of ${}^{64}$Ge($p,\gamma$)${}^{65}$As and ${}^{65}$As($p,\gamma$)${}^{66}$Se and the extent of nucleosynthesis in type I X-ray bursts
• Oxygen and light element synthesis by neutron-capture reactions in metal-free and extremely metal-poor AGB stars
• Nuclear Reaction Screening, Weak Interactions, and r-Process Nucleosynthesis in High Magnetic Fields
• Re-evaluation of the ${}^{16}$O($n$,$\gamma$)${}^{17}$O cross section at astrophysical energies and its role as neutron poison in the $s$ process
• Thermonuclear 42Ti(p,gamma)43V rate in type I X-ray bursts
• Progress in Nuclear Astrophysics of East and Southeast Asia
• Contribution of collapsars, supernovae, and neutron star mergers to the evolution of r-process elements in the Galaxy

Cited by in corpus (2)

• Photo-nuclear reaction rates of ${}^{157,159}$Ho and ${}^{163,165}$Tm and their impact in the $\gamma$--process
• Stellar ${\beta }^{-}$-decay rate of ${}^{63}$Ni and its impact on the $s$-process nucleosynthesis in massive stars