Neutron capture in low mass Asymptotic Giant Branch stars: cross sections and abundance signatures

Abstract

The recently improved information on the stellar (n,gamma) cross sections of neutron-magic nuclei at N = 82, and in particular of 142Nd, turned out to represent a sensitive test for models of s-process nucleosynthesis. While these data were found to be incompatible with the classical approach based on an exponential distribution of neutron exposures, they provide significantly better agreement between the solar abundance distribution of s nuclei and the predictions of models for low mass AGB stars. Particular attention is paid to a consistent description of s-process branchings in the region of the rare earth elements. It is shown that - in certain cases - the nuclear data are sufficiently accurate that the resulting abundance uncertainties can be completely attributed to stellar modelling. Thus, the s process becomes important for testing the role of different stellar masses and metallicities as well as for constraining the assumptions for describing the low neutron density provided by the 13C source.

49 pagg., 5 figg., accepted for publication by ApJ

References in corpus (1)

• Galactic chemical evolution of heavy elements: from Barium to Europium

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• On the solar abundance of indium
• 1D non-LTE corrections for chemical abundance analyses of very metal-poor stars
• Rubidium abundances in the globular clusters NGC 6752, NGC 1904 and NGC 104 (47 Tuc)
• What is the Milky Way outer halo made of? High resolution spectroscopy of distant red giants
• Velocity and abundance precisions for future high-resolution spectroscopic surveys: a study for 4MOST
• Origin of the heavy elements in HD 140283. Measurement of europium abundance
• Enrichment of the Galactic disc with neutron-capture elements: Mo and Ru
• NGC 1261: an $r$-process enhanced globular cluster from the Gaia-Enceladus event
• Accurate estimations of electromagnetic transitions of Sn IV for stellar and interstellar media
• New attempts to understand nanodiamond stardust
• Chemical composition of evolved stars in the young open clusters NGC 4609 and NGC 5316
• Accuracy of spectroscopy-based radioactive dating of stars
• The origin of the lead-rich stars in Galactic halo: investigation of the model parameters for the s-process
• The Pristine Inner Galaxy Survey (PIGS) VII: a discovery of the first inner Galaxy CEMP-r/s star
• 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 $M_{\odot }$
• Ruthenium and hafnium abundances in giant and dwarf barium stars
• The Gaia-ESO survey: placing constraints on the origin of r-process elements
• Chemical analysis of two extremely metal-poor stars HE 2148-2039 and HE 2155-2043
• The Interstellar Rubidium Isotope Ratio toward Rho Ophiuchi A
• Observational constraints on the origin of the elements. VI. Origin and evolution of neutron-capture elements as probed by the Gaia-ESO survey
• Chemical composition of giant stars in the open cluster IC 4756
• Multiple sources or late injection of short-lived r-nuclides in the early solar system?
• The 13C Pocket in Low Mass AGB Stars
• The 106Cd(alpha,alpha)106Cd elastic scattering in a wide energy range for gamma-process studies
• Radioactivities in Low- and Intermediate-Mass Stars
• Observational nuclear astrophysics: neutron-capture element abundances in old, metal-poor stars
• High resolution study of the abundance pattern of the heavy elements in very metal-poor field stars
• X-ray Decay Lines from Heavy Nuclei in Supernova Remnants as a Probe of the r-Process Origin and the Birth Periods of Magnetars
• The formation of the Milky Way halo and its dwarf satellites: a NLTE-1D abundance analysis. IV. Segue 1, Triangulum II, and Coma Berenices UFDs
• Palladium and silver abundances in stars with [Fe/H] > -2.6
• The peculiar abundances of HE 1005-1439. A carbon-enhanced extremely metal-poor star contaminated with products of both s-and i-process nucleosynthesis
• Nuclear physics and astrophysics of the r-process
• A holistic abundance analysis of r-rich stars
• The Pristine Inner Galaxy Survey (PIGS) IX. The largest detailed chemical analysis of very metal-poor stars in the Sagittarius dwarf galaxy
• Slow Neutron-Capture Process: Low-mass AGB stars and presolar silicon carbide grains
• Secular Outflows from Long-Lived Neutron Star Merger Remnants
• NLTE Analysis of Copper Abundances in the Galactic Bulge Stars
• Study of the element abundances in HD 140283: the abundance robustness of the weak r- and main r-process stars
• Diverse Supernova Sources for the r-Process and Abundances in Metal-Poor Stars
• Investigation for the puzzling abundance pattern of the neutron-capture elements in the ultra metal-poor star: CS 30322-023
• Observations of Neutron-Capture Elements in the Early Galaxy
• Chemical Evolution of R-process Elements in Stars (CERES). III. Chemical abundances of neutron capture elements from Ba to Eu
• Is Germanium (Ge, Z=32) A Neutron-Capture Element?
• Presolar Silicon Carbide Grains of Types Y and Z: Their Strontium and Barium Isotopic Compositions and Stellar Origins
• Stellar neutron capture reactions at low and high temperature
• More pieces of the puzzle: Chemistry and substructures in the Galactic thick disk
• Heavy elements in old very metal-rich stars
• Extragalactic 85Rb/87Rb and 6Li/7Li ratios in the Small Magellanic Cloud
• The 95zr(n, gamma)96zr cross section from the surrogate ratio method and its effect on the s-process nucleosynthesis
• Detailed abundances of the wide pairs of stars with and without planets: the binary systems 16 Cyg and HD 219542
• HD 209621: Abundances of neutron-capture elements
• Possible discovery of the r-process characteristics in the abundances of metal-rich barium stars
• Investigation for the enrichment pattern of the element abundances in r+s star HE 0338-3945: a special r-II star?
• The study of s-process nucleosynthesis based on barium stars, CEMP-s and CEMP-r/s stars
• High-resolution spectroscopic analysis of four new chemically peculiar stars
• Measurement of the 91Zr(p,gamma)92mNb cross section motivated by type Ia supernova nucleosynthesis
• Something borrowed, something blue: The nature of blue metal-poor stars inferred from their colours and chemical abundances
• Abundance Analysis of New $r$-Process-Enhanced Stars from the HESP-GOMPA Survey
• Rubidium in the Interstellar Medium
• Presolar grains
• Enrichment of the Galactic disc with neutron-capture elements: Gd, Dy, and Th
• The odd-isotope fractions of Barium in CEMP-r/s star HE 0338-3945 and r-II star CS 31082-001
• Unlocking the mystery of Sr synthesis in the early Galaxy through analysis of barium isotopes in very metal-poor stars
• HD 11397 and HD 14282 - Two new barium stars?
• Investigation of the single neutron exposure model for the s-process: the primary nature of the neutron source
• Capitalizing on Nuclear Data Libraries' Comprehensiveness to Obtain Solar System r-process Abundances
• Abundance analysis of s-process enhanced barium stars
• A chemodynamical analysis of bright metal-poor stars from the HESP-GOMPA survey -- Indications of a non-prevailing site for light r-process elements
• Tables of Neutron Thermal Cross Sections, Westcott Factors, Resonance Integrals, Maxwellian Averaged Cross Sections, Astrophysical Reaction Rates, and r-process Abundances Calculated from Evaluated Nuclear Data Libraries
• Detection of the actinide Th in an r-process-enhanced star with accretion origin
• The Impact of Inelastic Collisions with Hydrogen on NLTE Copper Abundances in Metal-Poor Stars
• First models of s process in AGB stars of solar metallicity for the stellar evolutionary code ATON with a novel stable explicit numerical solver
• The Abundance of Lead in Four Metal-Poor Stars
• Study of the abundance features of the metal-poor star HD 94028
• Contribution of type Ia supernovae to the chemical enrichment of the ultra-faint dwarf galaxy Bootes I
• Estimating R-Process Yields from Abundances of the Metal-Poor Stars
• Representation of s-process abundances for comparison to data from bulk meteorites
• Low-Energy Magnetic Radiation
• Magnetic Field Strength Effects on Nucleosynthesis from Neutron Star Merger Outflows
• The Gaia RVS benchmark stars II. A sample of stars selected for their Gaia high radial velocity
• Time scales of the s process - from minutes to ages
• Chemical Evolution of the Juvenile Universe
• Peculiarities of Abundances of Selected Elements in Metal-Rich Field RR Lyrae Stars
• The impact of nuclear masses near $N=82$ on $r$-process abundances
• i-process nucleosynthesis: observational evidences from CEMP stars
• Constraint on the cosmic age from the solar $r$-process abundances
• Chemical Evolution of Heavy Elements in the Early Galaxy: Implications for Stellar Sources
• Radiative neutron capture reaction rates for r-process nucleosynthesis
• Impact of $\text{T}$- and $\rho$-dependent decay rates and new (n,$\gamma$) cross sections on the $\text{s}$ process in low-mass AGB stars
• Hypothesis about Enrichment of Solar System
• Neutron-capture elements in a sample of field metal-poor N-rich dwarfs
• Abundance Uncertainties Obtained With the PizBuin Framework For Monte Carlo Reaction Rate Variations
• Experiments towards a neutron target for measurements in inverse kinematics
• Study of The Abundance Patterns in The Metal-Poor Stellar Stream
• Distribution of Europium in The Milky Way Disk; Its Connection to Planetary Habitability and The Source of The R-Process
• Production of n-rich nuclei in red giant stars
• Neutron-Capture Elements in the Double-Enhanced Star HE 1305-0007: a New s- and r-Process Paradigm
• Influence of the Outer Boundary Condition on models of AGB stars
• Investigating non-LTE abundances of Neodymium (Nd) in metal-poor FGK stars
• A New Moment-Based General-Relativistic Neutrino-Radiation Transport Code: Methods and First Applications to Neutron Star Mergers
• Stellar yields and abundances: new directions from planetary nebulae
• Complete nucleosynthesis calculations for low-mass stars from NuGrid
• An ancient system hidden in the Galactic plane?
• Barium lines in high-quality spectra of two metal-poor giants in the Galactic halo
• Nucleosynthetic Pt isotope anomalies and the Hf-W chronology of core formation in inner and outer solar system planetesimals
• Nuclear Data for Astrophysical Modeling
• Implications of low neutron star merger rates for gamma-ray bursts, r-process production and Galactic double neutron stars
• The R-Process Alliance: A Nearly Complete R-Process Abundance Template Derived from Ultraviolet Spectroscopy of the R-Process-Enhanced Metal-Poor Star HD 222925