Enhanced production of 60Fe in massive stars

Abstract

Massive stars are a major source of chemical elements in the cosmos, ejecting freshly produced nuclei through winds and core-collapse supernova explosions into the interstellar medium. Among the material ejected, long lived radioisotopes, such as 60Fe (iron) and 26Al (aluminum), offer unique signs of active nucleosynthesis in our galaxy. There is a long-standing discrepancy between the observed 60Fe/26Al ratio by γ-ray telescopes and predictions from supernova models. This discrepancy has been attributed to uncertainties in the nuclear reaction networks producing 60Fe, and one reaction in particular, the neutron-capture on 59Fe. Here we present experimental results that provide a strong constraint on this reaction. We use these results to show that the production of 60Fe in massive stars is higher than previously thought, further increasing the discrepancy between observed and predicted 60Fe/26Al ratios. The persisting discrepancy can therefore not be attributed to nuclear uncertainties, and points to issues in massive-star models.

References in corpus (31)

• Modules for Experiments in Stellar Astrophysics (MESA)
• Astrophysical Reaction Rates From Statistical Model Calculations
• Radioactive 26Al and massive stars in the Galaxy
• Nucleosynthesis and Remnants in Massive Stars of Solar Metallicity
• Modules for Experiments in Stellar Astrophysics (MESA): Time-Dependent Convection, Energy Conservation, Automatic Differentiation, and Infrastructure
• Presupernova evolution and explosive nucleosynthesis of rotating massive stars in the metallicity range -3 <=[Fe/H]<= 0
• The nucleosynthesis of Al26 and Fe60 in solar metallicity stars extending in mass from 11 to 120 Msun: the hydrostatic and explosive contributions
• Extraction of level density and gamma strength function from primary gamma spectra
• SPI observations of the diffuse 60Fe emission in the Galaxy
• Reference Database for Photon Strength Functions
• Novel technique for constraining r-process (n,$\gamma$) reaction rates
• Large enhancement of radiative strength for soft transisitons in the quasicontinuum
• Radioactive nuclei from cosmochronology to habitability
• 26Al and 60Fe From Supernova Explosions
• Impact of a low-energy enhancement in the gamma-ray strength function on the radiative neutron-capture
• Time resolved 2 million year old supernova activity discovered in Earth's microfossil record
• Search for supernova-produced 60Fe in a marine sediment
• Evidence for dipole nature of the low-energy $\gamma$ enhancement in ${}^{56}$Fe
• Single Degenerate Models for Type Ia Supernovae Progenitor's Evolution and Nucleosythesis Yields
• Novel Techniques for Constraining Neutron-Capture Rates Relevant for r-Process Heavy-Element Nucleosynthesis
• Electron-capture supernovae as sources of 60Fe
• Optical potentials for the rare-isotope beam era
• Radioactive Iron Rain: Transporting ${}^{60}$Fe in Supernova Dust to the Ocean Floor
• Gamma-ray Emission of 60Fe and 26Al Radioactivities in our Galaxy
• Direct measurements of neutron capture on radioactive isotopes
• Understanding the Low-Energy Enhancement of the $\gamma$-ray Strength Function of ${}^{56}$Fe
• ${}^{60}$Fe in core-collapse supernovae and prospects for X-ray and $\gamma$-ray detection in supernova remnants
• Aluminium-26 from massive binary stars I: non-rotating models
• Numerical studies on the link between radioisotopic signatures on Earth and the formation of the Local Bubble. II. Advanced modeling of interstellar 26Al, 53Mn, 60Fe, and 244Pu influxes as traces of past supernovae in the solar neighborhood
• Decay properties of ${}^{22}\mathrm{Ne}+\alpha$ resonances and their impact on $s$-process nucleosynthesis
• The ${}^{59}$Fe(n, γ)${}^{60}$Fe Cross Section from the Surrogate Ratio Method and Its Effect on the ${}^{60}$Fe Nucleosynthesis

Cited by in corpus (1)

• The Impact of the New ${}^{59}$Fe Decay Rates on ${}^{60}$Fe and ${}^{26}$Al Nucleosynthesis in Massive Stars