The ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}({}_{}{}^3{}_{}{}^{}\mathrm{He},t){}_{}{}^{14}{}_{}{}^{}\mathrm{O}$ reaction has been investigated at a ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ energy of 44.6 MeV. New levels were observed in ${}_{}{}^{14}{}_{}{}^{}\mathrm{O}$ up to an excitation energy of 18 MeV. An investigation of the (${}_{}{}^3{}_{}{}^{}\mathrm{He},t$) reaction on several other nuclei in the $1p$ shell, notably ${}_{}{}^{14}{}_{}{}^{}\mathrm{C}$ and ${}_{}{}^{15}{}_{}{}^{}\mathrm{N}$, revealed that the shapes and relative magnitudes of the angular distributions arising from single-particle transitions appear to fall into groups which are characterized by the specific shell-model transition involved. Utilizing this effect and other data, it was possible to make most probable spin and parity assignments of (1-), (0+), (3-), 2+, (2-), and 2+ for the levels observed in ${}_{}{}^{14}{}_{}{}^{}\mathrm{O}$ at 5.17, 5.91, 6.28, 6.60, 6.79, and 7.78 MeV, respectively. A correspondence can now be established for six excited $T=1\mathrm{}$ levels in all three members of the mass-14 triad.

• Received 3 November 1966

DOI:https://doi.org/10.1103/PhysRev.155.1170