Impact of New Gamow-Teller Strengths on Explosive Type Ia Supernova Nucleosynthesis

Abstract

Recent experimental results have confirmed a possible reduction in the GT${}_{+}$ strengths of pf-shell nuclei. These proton-rich nuclei are of relevance in the deflagration and explosive burning phases of Type Ia supernovae. While prior GT strengths result in nucleosynthesis predictions with a lower-than-expected electron fraction, a reduction in the GT${}_{+}$ strength can result in an slightly increased electron fraction compared to previous shell model predictions, though the enhancement is not as large as previous enhancements in going from rates computed by Fuller, Fowler, and Newman based on an independent particle model. A shell model parametrization has been developed which more closely matches experimental GT strengths. The resultant electron-capture rates are used in nucleosynthesis calculations for carbon deflagration and explosion phases of Type Ia supernovae, and the final mass fractions are compared to those obtained using more commonly-used rates.

Accepted for publication in Astrophysical Journal

References in corpus (8)

• A Chandrasekhar Mass Progenitor for the Type Ia Supernova Remnant 3C 397 from The Enhanced Abundances of Nickel and Manganese
• A localised subgrid scale model for fluid dynamical simulations in astrophysics II: Application to type Ia supernovae
• Subclasses of Type Ia Supernovae as the origin of [α/Fe] ratios in dwarf spheroidal galaxies
• Measurement of the Gamow-Teller Strength Distribution in 58Co via the 58Ni(t,3He) reaction at 115 MeV/nucleon
• Modification of the Brink-Axel Hypothesis for High Temperature Nuclear Weak Interactions
• Gamow-Teller transitions to 64-Cu measured using the 64-Zn(t,3-He) reaction
• Electron Capture Strength for {60,62}Ni and {58,60,62,64}Ni(p,n){58,60,62,64}Cu reactions at 134.3 MeV
• Type Ia Supernova Models and Progenitor Scenarios

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• Neutrino Spectra from Nuclear Weak Interactions in $sd$-Shell Nuclei Under Astrophysical Conditions