Angular distributions for the elastic scattering of $\alpha$ particles by ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ have been measured at 10-keV intervals from a bombarding energy of 5.0-12.5 MeV. Real phase shifts have been extracted by means of a partial- wave analysis of the data between 5 and 10 MeV. Twenty-seven resonances are found in the ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$ excitation energy range of 8.73-12.77 MeV. Seven of the corresponding levels in ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$ have not been previously reported. Spins and parities are assigned to 26, confirming a number of previously tentative assignments and correcting a few. Resonance widths are estimated for most of the levels.

• Received 18 November 1968

DOI:https://doi.org/10.1103/PhysRev.181.1455