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. 2010 Oct 8;105(15):152501.
doi: 10.1103/PhysRevLett.105.152501. Epub 2010 Oct 8.

Direct measurements of ²²Na(p,γ)²³Mg resonances and consequences for ²²Na production in classical novae

A L Sallaska  1 , C Wrede, A García, D W Storm, T A D Brown, C Ruiz, K A Snover, D F Ottewell, L Buchmann, C Vockenhuber, D A Hutcheon, J A Caggiano
Affiliations

Direct measurements of ²²Na(p,γ)²³Mg resonances and consequences for ²²Na production in classical novae

A L Sallaska et al. Phys Rev Lett. .

Erratum in

  • Phys Rev Lett. 2010 Nov 12;105(20):209901

Abstract

The radionuclide 22Na is a potential astronomical observable that is expected to be produced in classical novae in quantities that depend on the thermonuclear rate of the 22Na(p,γ)23Mg reaction. We have measured the strengths of low-energy 22Na(p,γ)23Mg resonances directly and absolutely using a radioactive 22Na target. We find the strengths of resonances at Ep=213, 288, 454, and 610 keV to be higher than previous measurements by factors of 2.4-3.2, and we exclude important contributions to the rate from proposed resonances at Ep=198, 209, and 232 keV. The 22Na abundances expected in the ejecta of classical novae are reduced by a factor of ≈2.

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