Radiative capture of tritons byN14andO17levels above 19 MeV

Cross sections for the radiative capture of tritons by ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ have been measured in the incident energy range 0.8 to 3.3 MeV and found to be of order 200-300 nb/sr. The 90° excitation functions exhibit resonant structures for the transitions to the $\frac{5}{2^{+}}$ ground state of ${}_{}{}^{17}{}_{}{}^{}\mathrm{O}$ and the $\frac{1}{2^{+}}$ (0.87-MeV) first excited state. Multilevel $S$-matrix fits of both excitation functions and angular distributions, on the assumption that dipole transitions dominate, permit $J^{\pi }$ assignments for the observed resonances to be limited to a very few possibilities; the best fit results, which are also most consistent with other relevant arguments, give the most likely assignments $\frac{3}{2^{-}}$, $\frac{5}{2^{-}}$, $\frac{1}{2^{+}}$, and $\frac{3}{2^{-}}$ for states at 19.76, 20.39, 20.58, and 21.05 MeV, respectively, although the parities cannot be individually ascertained. The lower limit for the radiative widths ${\Gamma }_{\gamma }$ ranges from 1 to 6 eV. An additional level also appears to be present at ∼19.3 MeV.