Na21(p,γ)Mg22Reaction and Oxygen-Neon Novae

Abstract
The Na21(p,γ)Mg22 reaction is expected to play an important role in the nucleosynthesis of Na22 in oxygen-neon novae. The decay of Na22 leads to the emission of a characteristic 1.275 MeV gamma-ray line. This report provides the first direct measurement of the rate of this reaction using a radioactive Na21 beam, and discusses its astrophysical implications. The energy of the important state was measured to be Ec.m.=205.7±0.5keV with a resonance strength ωγ=1.03±0.16stat±0.14sys   meV.
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