Abstract
A kinematically complete study of the (p,γ→2α reaction at =25 MeV is described. An upper limit of dσ/dΩ<0.04 μb is reported for the =90° capture cross section to the states at 16.62 and 16.93 MeV, which is five times smaller than published results. This new datum is shown to be more consistent with a semidirect reaction mechanism involving the giant dipole resonance built on the 2.94-MeV state than the previously proposed direct reaction mechanism.
- Received 24 May 1990
DOI:https://doi.org/10.1103/PhysRevC.43.2866
©1991 American Physical Society