Abstract
The \ensuremath{\beta}-delayed \ensuremath{\alpha} spectrum of $^{17}\mathrm{N}$ has been measured using a molecular $^{17}\mathrm{NO}^{+}$ beam from the TRIUMF isotope separator. Thin surface barrier detector pairs were used to count the \ensuremath{\alpha} particles in coincidence with $^{13}\mathrm{C}$ recoil nuclei. The resulting spectrum has been fitted with a K-matrix parametrization. The \ensuremath{\beta}-delayed \ensuremath{\alpha} decay of states at 7.99 and 8.20 MeV in the $^{17}\mathrm{O}$ daughter has been observed. A total \ensuremath{\beta}\ensuremath{\alpha}-branching ratio of (2.5\ifmmode\pm\else\textpm\fi{}0.4)\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}5}$ has been determined for this decay mode of $^{17}\mathrm{N}$.
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