Direct Measurements of Na22(p,γ)Mg23 Resonances and Consequences for Na22 Production in Classical Novae

Details Direct Measurements of Na22(p,γ)Mg23 Resonances and Consequences for Na22 Production in Classical Novae Direct Measurements of Na22(p,γ)Mg23 Resonances and Consequences for Na22 Production in Classical Novae

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010phrvl.105o2501s&link_type=abstract

Physical Review Letters, vol. 105, Issue 15, id. 152501

Astronomy and Astrophysics

Astronomy

9

Explosive Burning In Accreting Binary Systems, 20<=A<=38, X- And Gamma-Ray Spectroscopy, Reaccelerated Radioactive Beams

Scientific paper

The radionuclide Na22 is a potential astronomical observable that is expected to be produced in classical novae in quantities that depend on the thermonuclear rate of the Na22(p,γ)Mg23 reaction. We have measured the strengths of low-energy Na22(p,γ)Mg23 resonances directly and absolutely using a radioactive Na22 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 Na22 abundances expected in the ejecta of classical novae are reduced by a factor of ≈2.

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