The giant dipole resonance of ${}_{}{}^{17}{}_{}{}^{}\mathrm{F}$ was studied by radiative proton capture. An observed integrated strength of 10 MeV mb, presumably mostly $T=\frac{1}{2}$, is centered at 22 MeV with a width of ~ 5 MeV. Calculations were performed for odd-parity 2p-1h, 1p excitations in a basis of good isospin. These calculations predict correctly the observed strength distribution. Some general rules for the $T$ components of the $E1\mathrm{}$ collective state are consistent with the microscopic calculation. The $f_{\frac{7}{2}}\to d_{\frac{5}{2}}$ strength was located near 18 MeV, in agreement with other experimental evidence.

NUCLEAR REACTIONS ${}_{}{}^{17}{}_{}{}^{}\mathrm{F}$, ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}(p, \gamma )$, $E_p=15.75-31.66\mathrm{}$ MeV. Measured $\frac{d\sigma }{d\Omega }\left(90\mathrm{}°\right)$. Measured angular distributions deduced $E_{T=\frac{1}{2}}$ of GDR. Calculated $1p$ and 2p-1h states of ${}_{}{}^{17}{}_{}{}^{}\mathrm{F}$. Compared with experimental results.

• Received 5 November 1974

DOI:https://doi.org/10.1103/PhysRevC.11.1008