Photoneutron Reactions in N, O, F, Cu, Ag, and In

Using an energy scale based on an electrical "zero" and the (γ, n) thresholds of F¹⁹, N¹⁴, and C¹², five (γ, n) thresholds were measured: Ag¹⁰⁹, 9.14±{}0.05 Mev; Ag¹⁰⁷ to 24-min Ag¹⁰⁶, 9.43±{}0.05; Cu⁶⁵, 9.89±{}0.11; Cu⁶³, 10.80±{}0.04; and In¹¹⁵ to 49-day In¹¹⁴ᵐ, 9.22±{}0.10. Breaks, interpreted to be levels in the initial nucleus, were found at 10.47±{}0.02 Mev in F¹⁹ and 16.17±{}0.05 Mev in O¹⁶. The observed O¹⁶(γ, n)O¹⁵ threshold was in poor agreement with the known Q value. Two half-lives were measured: F¹⁸, 1.83±{}0.02 hours and In¹¹⁴ᵐ, 49±{}1 days.