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The technique of invariant mass spectroscopy has been used to measure, forthe first time, the ground state energy of neutron-unbound $^{28}\textrm{F},$determined to be a resonance in the $^{27}\textrm{F} + n$ continuum at$2\underline{2}0 (\underline{5}0)$ keV. States in $^{28}\textrm{F}$ werepopulated by the reactions of a 62 MeV/u $^{29}\textrm{Ne}$ beam impinging on a288 $\textrm{mg/cm}^2$ beryllium target. The measured $^{28}\textrm{F}$ groundstate energy is in good agreement with USDA/USDB shell model predictions,indicating that $pf$ shell intruder configurations play only a small role inthe ground state structure of $^{28}\textrm{F}$ and establishing a low-$Z$boundary of the island of inversion for N=19 isotones.

Exploring the Low-$Z$ Shore of the Island of Inversion at $N = 19$