First inverse kinematics measurement of key resonances in the ${}^{22}\text{Ne}(p,\gamma {)}^{23}\text{Na}$ reaction at stellar temperatures

Abstract

In this Letter we report on the first inverse kinematics measurement of key resonances in the ${}^{22}\text{Ne}(p,\gamma {)}^{23}\text{Na}$ reaction which forms part of the NeNa cycle, and is relevant for ${}^{23}$Na synthesis in asymptotic giant branch (AGB) stars. An anti-correlation in O and Na abundances is seen across all well-studied globular clusters (GC), however, reaction-rate uncertainties limit the precision as to which stellar evolution models can reproduce the observed isotopic abundance patterns. Given the importance of GC observations in testing stellar evolution models and their dependence on NeNa reaction rates, it is critical that the nuclear physics uncertainties on the origin of ${}^{23}$Na be addressed. We present results of direct strengths measurements of four key resonances in ${}^{22}\text{Ne}(p,\gamma {)}^{23}\text{Na}$ at E${}_{\text{c}.m.}$ = 149 keV, 181 keV, 248 keV and 458 keV. The strength of the important E${}_{\text{c}.m.}$ = 458 keV reference resonance has been determined independently of other resonance strengths for the first time with an associated strength of $\omega \gamma$ = 0.439(22) eV and with higher precision than previously reported. Our result deviates from the two most recently published results obtained from normal kinematics measurements performed by the LENA and LUNA collaborations but is in agreement with earlier measurements. The impact of our rate on the Na-pocket formation in AGB stars and its relation to the O-Na anti-correlation was assessed via network calculations. Further, the effect on isotopic abundances in CO and ONe novae ejecta with respect to pre-solar grains was investigated.

arXiv comment6 pages, 5 figures, preprint for PRL submission

References in corpus (17)

• Multiple populations in globular clusters. Lessons learned from the Milky Way globular clusters
• Na-O Anticorrelation and HB. VII. The chemical composition of first and second-generation stars in 15 globular clusters from GIRAFFE spectra
• Na-O Anticorrelation and HB. VIII. Proton-capture elements and metallicities in 17 globular clusters from UVES spectra
• Nucleosynthesis in Classical Novae: ONe vs. CO White Dwarfs
• Evolution, nucleosynthesis and yields of low mass AGB stars
• The Effects of Thermonuclear Reaction Rate Variations on Nova Nucleosynthesis: A Sensitivity Study
• The Imprint of Nova Nucleosynthesis in Presolar Grains
• Origin of multiple stellar populations in globular clusters and their helium enrichment
• NuGrid Stellar Data Set. II. Stellar Yields from H to Bi for Stellar Models with Mzams = 1 to 25Msun and Z = 0.0001 to 0.02
• Na-O Anticorrelation And HB I. The Na-O anticorrelation in NGC 2808
• Charged-Particle Thermonuclear Reaction Rates: III. Nuclear Physics Input
• Three new low-energy resonances in the ${}^{22}$Ne(p,$\gamma$)${}^{23}$Na reaction
• Direct measurement of low-energy ${}^{22}$Ne(p,$\gamma$)${}^{23}$Na resonances
• ${}^{22}$Ne and ${}^{23}$Na ejecta from intermediate-mass stars: The impact of the new LUNA rate for ${}^{22}$Ne(p,$\gamma$)${}^{23}$Na
• Direct capture cross section and the $E_p$ = 71 and 105 keV resonances in the ${}^{22}$Ne($p,\gamma$)${}^{23}$Na reaction
• Strengths of the resonances at 436, 479, 639, 661, and 1279 keV in the ${}^{22}$Ne(p,$\gamma$)${}^{23}$Na reaction
• Variations in the Na-O anticorrelation in globular clusters: Evidence for a deep mixing episode in red giant branch stars

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• Solar fusion III: New data and theory for hydrogen-burning stars
• First inverse kinematics study of the ${}^{22}$Ne$(p,\gamma {)}^{23}$Na reaction and its role in AGB star and classical nova nucleosynthesis
• Searching for resonance states in ${}^{22}$Ne($p,\gamma$)${}^{23}$Na