Positions and Widths ofO16Levels up to 15-MeV Excitation

Abstract

Protons from the ${\mathrm{N}}^{14}({\mathrm{He}}^3, p){\mathrm{O}}^{16}$ reaction were analyzed with a broad-range spectrograph. Results from 10 runs were averaged to give positions of 23 levels and the widths of 11 of these which are more than 12 keV wide. Two levels were found near 11 MeV with a spacing of 16.0±0.5 keV. Excitation energies (in MeV) follow with measured widths (in keV) in parentheses. 6.052±0.005, 6.131±0.004, 6.916±0.003, 7.115±0.003, 8.870±0.003, 9.614±0.030(510±60), 9.847±0.003, 10.353±0.004(27±8), 10.952±0.003, 11.080±0.003, 11.096±0.003, 11.521±0.004(78±8), 12.053±0.003, 12.437±0.007(94±15), 12.528±0.003, 12.798±0.006(41±10), 12.964±0.003, 13.105±0.015(160±30), 13.253±0.005(25±8), 13.665±0.006 (65±8), 13.869±0.010(85±20), 13.975±0.004(27±8), 14.922±0.006(60±10). A new level in ${\mathrm{O}}^{16}$ is thus found, precise excitation energies are given, and width measurements are confirmed for levels broader than 10 keV.