Spin-parity combinations inF18

We measured the tensor analyzing power $T_{20}$ for the reaction ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}(\overrightarrow{d},\alpha ){}_{}{}^{18}{}_{}{}^{}\mathrm{F}$ for $E_x\left({}_{}{}^{18}{}_{}{}^{}\mathrm{F}\right)\le 6.48$ MeV at ${\theta }_{\mathrm{lab}}=176.3\mathrm{}°$ and for incident energies of $10.5\le E_d\le 12.0$ MeV in steps of 0.25 MeV. Comparison of the measured $T_{20}$ values with theoretical predictions leads to assignments of natural or unnatural parity to about 30 levels in ${}_{}{}^{18}{}_{}{}^{}\mathrm{F}$. Combining the present results with published spectroscopic information leads to new unambiguous $J^{\pi }$ and isospin assignments for some levels and the confirmation of previously determined values for others.