Reevaluation of the ${}^{22}$Na(p,$\gamma$) reaction rate: Implications for the detection of ${}^{22}$Na gamma rays from novae

Abstract

Understanding the processes which create and destroy ${}^{22}$Na is important for diagnosing classical nova outbursts. Conventional ${}^{22}$Na(p,$\gamma$) studies are complicated by the need to employ radioactive targets. In contrast, we have formed the particle-unbound states of interest through the heavy-ion fusion reaction, ${}^{12}$C(${}^{12}$C,n)${}^{23}$Mg and used the Gammasphere array to investigate their radiative decay branches. Detailed spectroscopy was possible and the ${}^{22}$Na(p,$\gamma$) reaction rate has been re-evaluated. New hydrodynamical calculations incorporating the upper and lower limits on the new rate suggest a reduction in the yield of ${}^{22}$Na with respect to previous estimates, implying a reduction in the maximum detectability distance for ${}^{22}$Na $\gamma$ rays from novae.

4 pages, 1 figure

References in corpus (6)

• Nucleosynthesis in Classical Novae: ONe vs. CO White Dwarfs
• The Effects of Thermonuclear Reaction Rate Variations on Nova Nucleosynthesis: A Sensitivity Study
• Nuclear uncertainties in the NeNa-MgAl cycles and production of 22Na and 26Al during nova outbursts
• Gamma--ray emission from individual classical novae
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• Horizons: Nuclear Astrophysics in the 2020s and Beyond
• Direct measurements of 22Na(p,g)23Mg resonances and consequences for 22Na production in classical novae
• Absolute Determination of the 22Na(p,g) Reaction Rate in Novae
• Low-energy ${}^{23}$Al $\beta$-delayed proton decay and ${}^{22}$Na destruction in novae
• Search for ${}^{22}$Na in novae supported by a novel method for measuring femtosecond nuclear lifetimes
• Proton Threshold States in the 22Na(p,gamma)23Mg Reaction and Astrophysical Implications
• Measurement of Lifetimes in 23Mg
• Prospects in Classical Nova Modeling and Nucleosynthesis
• Compton degradation of gamma-ray line emission from radioactive isotopes in the classical nova V2491 Cygni
• Understanding the cosmic abundance of ${}^{22}$Na: lifetime measurements in ${}^{23}$Mg
• Astronomy with Radioactivities: Chapter 9, Nuclear Reactions