The properties of resonances in the ${}^{18}\mathrm{O}+\alpha$ interaction are important for analyses of astrophysical processes and for understanding of the development of the $\alpha$-cluster structure with addition of neutrons to 4N nuclei. Previous high-energy resolution measurements have not been treated using the contemporary $R$-matrix approach. We have performed an $R$-matrix analysis of the resonant data [D. Powers, J. K. Bair, J. L. C. Ford, Jr., and H. B. Willard, Phys. Rev. 134, B1237 (1964)] and obtained new data on 15 levels in the excitation region of 11.7–12.5 MeV ${}^{22}\mathrm{Ne}$. It appears that the model calculations did not predict the observed tendency in the ${}^{20–22}\mathrm{Ne}$ $\alpha$ clustering. This paper is the first step of our program of investigation of the ${}^{22}\mathrm{Ne}$ spectrum in resonant reactions.

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• Elastic scattering reactions
• H & He induced nuclear reactions
• Nuclear reactions
• 6 ≤ A ≤ 19