Two-Step Processes in the OXYGEN-16

Differential cross sections and vector-analyzing powers were measured at incident deuteron energies of 15 MeV and 17 MeV for the ('16)O(d,d)('16)O, ('16)O(d,d')('16)O(3(' -)) and ('16)O(d,p)('17)O reactions and at 16 MeV for the ('18)O(d,d)('18)O, ('18)O(d,d')('18)O(2('+)) and ('18)O(d,p(,0))('19)O reactions. The data are compared to the predictions of the DWBA and CCBA theories. The spectroscopic factors of Wildenthal's shell-model calculations were used in the CCBA calculations. The fits to the data for the ('16)O(d,p)('17)O reaction indicate that the first (1/2('+)) and the fifth (3/2('+)) excited states are formed exclusively by one -step transfer, the ground state (5/2('+)), fourth (3/2(' -)) and eighth (7/2('-)) excited states are produced mainly by one-step processes and the second (1/2('-)) and third (5/2('-)) excited states require both one- and two-step processes. The ground state of ('19)O (5/2('+)) is formed mainly by a one-step transfer with a small contribution from the two-step process. The magnitude of the previously determined spectroscopic factors for the two-step transfer appears to have been overestimated.