Abstract
The O17(p,n)F17 reaction has been observed for the first time in the energy region from threshold to 5 MeV. Total neutron-production cross sections measured with good resolution are given. The reaction threshold is determined to be 3743 ± 6 keV. High-resolution total neutron cross sections are also given for the reaction O18(p,n)F18 from threshold to 4 MeV.