0+ to 0- transition in the 16O(p,n)16F reaction at 79 MeV

The isovector 0(+) to 0(-) transition in the O-16(p,n)F-16 (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 F-16 at 12 laboratory angles from 0.3 degrees to 63 degrees 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.