The isovector 0${}^{+}$ to 0${}^{-}$ transition in the ${}^{16}$O${\mathrm{}(p,n)\mathrm{}}^{16}$F (g.s.) reaction was studied at 79 MeV. Differential cross sections were extracted for the transitions to the low-lying complex of 0${}^{-}$, 1${}^{-}$, 2${}^{-}$, and 3${}^{-}$ states in ${}^{16}$F at 12 laboratory angles from 0.3$°$ to 63$°$ which correspond to momentum transfers from 0.21 to 2.0 fm${}^{-1}$. An energy resolution of 140 keV (FWHM) was achieved which was sufficient to separate the yields for each of these four states. Distorted-wave-impulse-approximation (DWIA) calculations were performed and compared with the extracted cross sections for these four transitions. The DWIA calculations with the effective interaction of Franey and Love provide a good description of the experimental measurements for the 0${}^{-}$ transition at low momentum transfer, but overestimate the data at larger momentum transfer. The experimental results for the 1${}^{-}$, 2${}^{-}$, and 3${}^{-}$ transitions are described reasonably well by the DWIA calculations.

• Received 5 August 1997

DOI:https://doi.org/10.1103/PhysRevC.56.3210