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Spectroscopy of neutron-unbound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mrow><mml:mn>27</mml:mn><mml:mo>,</mml:mo><mml:mn>28</mml:mn></mml:mrow></mml:msup></mml:math>F
The ground state of ${}^{28}\text{F}$ has been observed as an unbound resonance $2\underline{2}0$ keV above the ground state of ${}^{27}$F. A comparison of this result with USDA/USDB shell model predictions leads to the conclusion that the ${}^{28}$F ground state is primarily dominated by $sd$-shell configurations. Here we present a detailed …