Low lying states in 11N and 15F

Low lying resonances in the unbound nuclei 11N and 15F have been calculated using a conventional Woods-Saxon potential plus a surface term deduced from the mirror nuclei 11Be and 15C, respectively. Calculations for 11N are in good agreement with experimental results showing that both a halo nucleus and its unbound mirror nucleus can be described simultaneously. For the 13C and 13N mirror nuclei where the surface term is weaker we have checked that our results are similar to what was previously obtained with pure Woods-Saxon potentials. Within the same approach, two 1/2+ and 5/2+ narrow resonances are predicted in 15F, mirror of 15C, at 1.2 and 2.35 MeV, also in agreement with measurements. copyright 1997 The American Physical Society