Abstract
A comparison is made between experimental cross sections for the () reaction to the ground-state analogs of the isotopes , , , and coupled-channel calculations including coupling to the and inelastic states and their analogs. When the coupling is included, very good fits are obtained for the () analog differential cross section using uniform optical parameters for all three isotopes. Experimentally observed variations of about 50% in , which in distorted-wave Born approximation changes by only 10%, are explained by the coupling. A crude third-order distorted-wave Born approximation model is developed which shows that the three-step amplitudes → → analog → analog, → → → analog, and → analog → analog → analog are all in phase and are destructive to the dominant one-step → analog amplitude.
NUCLEAR REACTIONS , , ; measured , analog cross sections at 18, 22, 26 MeV; , , and analog at 16 and 26 MeV calculated including coupling to inelastic channels.
- Received 21 August 1975
DOI:https://doi.org/10.1103/PhysRevC.13.548
©1976 American Physical Society