Using the non-central particle-hole interaction determined from a fit of the energy spectra of the non-normal-parity states in ${}_{}{}^{15}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, and ${}_{}{}^{17}{}_{}{}^{}\mathrm{O}$, we have reproduced the energy spectrum of the non-normal-parity states in ${}_{}{}^{19}{}_{}{}^{}\mathrm{F}$ satisfactorily via a shell-model calculation. The important contribution from $T=1\mathrm{}$ states of ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$ coupled to a $1p_{\frac{1}{2}}$ hole in the ${}_{}{}^{19}{}_{}{}^{}\mathrm{F}$ wave functions is pointed out.

• Received 9 June 1971

DOI:https://doi.org/10.1103/PhysRevC.4.1991