Scattering of Neutrons fromO16in the 2.2- to 4.2-MeV Energy Range

We have measured the differential cross sections for scattering of neutrons from ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ at some 14 energies between 2.2- and 4.2-MeV neutron energy by detecting scattered neutrons. In the vicinity of the 3.77-MeV peak in the total cross section of ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, we redetermined the total cross section with a 5-keV energy spread. From a phase-shift analysis of our data and other data taken from the literature, we assign resonance parameters for seven states of ${}_{}{}^{17}{}_{}{}^{}\mathrm{O}$ between 7.30- and 8.21-MeV excitation energy as follows (in order: excitation energy of ${}_{}{}^{17}{}_{}{}^{}\mathrm{O}$, $J$ value, parity, and reduced width in single-particle units $\frac{{\hslash }^2}{\mu {\mathrm{a}}^2})$: 7.30 (${\frac{3}{2}}^{+}$, 0.23), 7.67 (${\frac{3}{2}}^{-}$, 0.07), 7.691 (${\frac{7}{2}}^{-}$, 0.03), 7.694 (${\frac{3}{2}}^{+}$, 0.001), 7.91 (½-,0.02), 8.08 (${\frac{3}{2}}^{+}$, 0.03), and 8.21 (${\frac{3}{2}}^{-}$, 0.01). Our finding the narrow ${\frac{3}{2}}^{+}$ state at 7.694 MeV has removed a difficulty in resonance-parameter assignment at the 3.77-MeV neutron energy peak in the total cross section of ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$.