Abstract
The and reactions have been studied at a beam energy of 38 MeV. At this energy these reactions exhibit a high selectivity for populating α-particle cluster states. The angular distributions for these states have been analyzed using an exact-finite-range coupled-channels Born-approximation code incorporating final-state cluster wave functions derived from an α-core folded potential. The resulting -particle spectroscopic factors () for the , , and members of the ground state band are in good agreement with cluster model predictions. For the 7.12-MeV () state in , the spectroscopic factor () is consistent with other analyses but is uncertain by a factor of 2 due to the presence of significant compound-nuclear contributions to this transition. In general, for those states which are not selectively populated at forward angles the measured angular distributions are well described by a Hauser-Feshbach calculation. In particular it is shown that both the magnitude and shape of the angular distributions for the 11.10-MeV () state populated in the and reactions can be well accounted for in terms of statistical compound-nuclear contributions. The elastic scattering of ions from several light targets has also been studied and optical-model potentials derived.
NUCLEAR REACTIONS , , , MeV, measured , Hauser-Feshbach and finite-range CCBA analysis, spectroscopic factors.
- Received 1 March 1976
DOI:https://doi.org/10.1103/PhysRevC.14.491
©1976 American Physical Society