The 21Na(p,gamma)22Mg Reaction and Oxygen-Neon Novae

Abstract

The 21Na(p,gamma)22Mg reaction is expected to play an important role in the nucleosynthesis of 22Na in Oxygen-Neon novae. The decay of 22Na 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 21Na beam, and discusses its astrophysical implications. The energy of the important state was measured to be E${}_{c.m.}$= 205.7 $\pm$ 0.5 keV with a resonance strength $\omega \gamma =1.03\pm 0.16_{stat}\pm 0.14_{sys}$ meV.

Accepted for publication in Physical Review Letters

References in corpus (1)

• On the 21Na(p,gamma)22Mg thermonuclear rate for 22Na production in novae

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