The total neutron yield of the reaction ${}_{}{}^{14}{}_{}{}^{}\mathrm{C}(\alpha , n){}_{}{}^{17}{}_{}{}^{}\mathrm{O}$ has been measured in the alpha-particle bombarding-energy range of 2.5 to 5.1 MeV. Six new anomalies were observed in the yield curve at alpha-particle energies of 4.030±0.015, 4.07±0.04, 4.17±0.04, 4.434±0.010, 4.70±0.04, and 5.004±0.010 MeV. These would correspond to excitation energies in the ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$ compound nucleus of 9.361, 9.39, 9.47, 9.675, 9.88, and 10.119 MeV. The experimental widths vary from 21 to 200 keV. An approximate value of the average alpha-particle strength function was obtained.

• Received 13 December 1965

DOI:https://doi.org/10.1103/PhysRev.144.799