Structure of ${}_{}{}^{15}{}_{}{}^{}\mathrm{N}$ and the ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}\mathrm{}(d,p)\mathrm{}{}_{}{}^{15}{}_{}{}^{}\mathrm{N}$ Reaction

Angular distributions have been measured for the ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}\mathrm{}(d,p)\mathrm{}{}_{}{}^{15}{}_{}{}^{}\mathrm{N}$ reaction to levels up to 10.80-MeV excitation in ${}_{}{}^{15}{}_{}{}^{}\mathrm{N}$. Distorted-wave Born-approximation fits have been obtained to most of these levels and absolute spectroscopic factors have been extracted. Although the spectroscopic factors for the low-lying ${\frac{5}{2}}^{+}$, ${\mathrm{½}}^{+}$ doublet at 5.27, 5.30 MeV are very small, those for the next four positive-parity levels are close to the single-particle value of 1. To explain these features a weak-coupling model is proposed, in which an $s_{\frac{1}{2}}$ or $d_{\frac{5}{2}}$ particle is coupled to a core corresponding to the $1^{+}$, $T=0\mathrm{}$ ground state of ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ or to the $0^{+}$, $T=1\mathrm{}$ first excited state. Explicitly included in the model is the splitting due to the T·t force, which accounts for the low-lying position of the ${\frac{5}{2}}^{+}$, ${\mathrm{½}}^{+}$ doublet.