A new transition is reported in the beta-delayed neutron decay of ${}^{18}\mathrm{N}$. The observed neutron energy is 3.78±0.05 MeV with a branching ratio of 0.05±0.03%, which corresponds to an excitation energy of 12.05±0.05 MeV in the daughter nucleus ${}^{18}\mathrm{O}$. The log $\mathit{ft}$ value of this transition is 5.24±0.3, which, together with the previously reported electron scattering data, determines the $J^{\pi }$ value of this level to be $1^{-}$. The experimental data are compared to the shell model calculations in different model spaces.

• Received 5 November 2006

DOI:https://doi.org/10.1103/PhysRevC.75.057302