A multichannel R-matrix formalism was used to fit ${}^{21}\mathrm{Na}+$ p resonant elastic and inelastic scattering data taken at the TRIUMF UK detector array facility at TRIUMF-ISAC. Five resonances were observed corresponding to states in ${}^{22}\mathrm{Mg}$ above the proton threshold. Four of these corresponded to states seen in previous transfer reaction studies where firm spin-parity assignments could not be made. One new resonance, previously unobserved in any reaction, was also seen. Where possible, resonance energies, partial widths, and spin-parity values of these resonances were extracted. The correspondence between these states and possible analogs in the mirror nucleus ${}^{22}\mathrm{Ne}$ is discussed, as well as the relation to $T=1$ states in the nucleus ${}^{22}\mathrm{Na}$.

• Received 25 October 2004

DOI:https://doi.org/10.1103/PhysRevC.71.025802