Positions and Widths ofO17Levels from 4- to 6-Mev Excitation

The ${\mathrm{O}}^{16}(d, p){\mathrm{O}}^{17}$ reaction was used to measure the positions and widths of ${\mathrm{O}}^{17}$ levels from 4- to 6-Mev excitation. Proton spectra were obtained at high resolution with a broad-range spectrograph. This instrument accurately measured the widths and shapes of the energy distributions of the proton groups arising from the wider levels. Disagreements among other experiments concerning the ${\mathrm{O}}^{17}$ levels are explained in terms of the large difference in level widths. A comparison of these directly measured widths is made with those obtained from neutron scattering experiments. The observed shape of the energy distribution is that predicted by resonance theory. The 0.87-Mev level is found to be single rather than double as recently suggested. Excitation energies obtained (in Mev) are 0.871±0.004, 3.055±0.004, 3.846±0.005, 4.553±0.006, 5.083±0.010, 5.215±0.005, 5.378±0.007, 5.695±0.005, 5.731±0.005, 5.866±0.005, 5.94±0.015. Widths of levels 4, 5, 7, and 11 are (in kev) 40±5, 95±5, 28±7, and 23±10, respectively. The other levels have widths less than 8 kev.