The long-lived radioactive nuclide ${}^{22}\mathrm{Na}$ $(t_{1∕2}=2.6\mathrm{yr})$ is an astronomical observable for understanding the physical processes of oxygen-neon novae. Yields of ${}^{22}\mathrm{Na}$ in these events are sensitive to the unknown total rate of the ${}^{21}\mathrm{Na}(p,\gamma ){}^{22}\mathrm{Mg}$ reaction. Using a high intensity ${}^{21}\mathrm{Na}$ beam at the $\mathrm{TRIUMF}\text{−}\mathrm{ISAC}$ facility, the strengths of seven resonances in ${}^{22}\mathrm{Mg}$, of potential astrophysical importance, have been directly measured at center of mass energies from $E_{\mathrm{c.m.}}=200$ to $1103\mathrm{keV}$. We report the results obtained for these resonances and their respective contributions to the ${}^{21}\mathrm{Na}(p,\gamma ){}^{22}\mathrm{Mg}$ rate in novae and x-ray bursts, and their impact on ${}^{22}\mathrm{Na}$ production in novae.

• Received 12 February 2004

DOI:https://doi.org/10.1103/PhysRevC.69.065803