Structure of $^{10}$N

We report on the first observation of the ground and first excited states in $^{10}$N via $^{9}$C+p resonance scattering. The experiment was carried out at the Cyclotron Institute at Texas A\&M University. Both states were determined to be $\ell=0$. We can now reliably place the location of the $2$s$_{1/2}$ shell in $^{10}$N at $2.3 \pm 0.2$ MeV above the proton decay threshold. Using mirror symmetry and correcting for Thomas-Ehrman shift we argue that the ground state of $^{10}$Li is an $\ell=0$ states that should be very close to the neutron threshold.