Abstract
Thick targets of , , and were bombarded with and ions accelerated in the Oak Ridge tandem Van de Graaff accelerator. Cross sections were measured for the neutron transfer reactions (, ), (, ), (, ), (, ), and (, ) at energies close to the Coulomb barriers for the various target and projectile combinations. The data were analyzed by the use of the tunneling theory of Breit et al. The theory was found to account for the shapes of the excitation functions of the first three reactions listed above. The excitation functions for the two reactions with as the target nucleus were found to have slopes that were steeper than that predicted by the tunneling theory. This is thought to be an indication that even at energies below the Coulomb barrier, excited states in are populated in the transfer process. By assuming that the neutron reduced width in is the same in both the - and -induced reactions, a reduced-width ratio was extracted for the transferred neutron in to that in . The ratio was found to be ∼2.0 as compared with values of ∼3.7 extracted earlier from low-energy cross-section data for (, ) and (, ) reactions on targets of and . If the ±30% error limits on the experimental cross sections are taken into account, the value of 2 is not in disagreement with the earlier determined ratios of 3.7. We feel, however, that the difference arises because transfers to the ground states in and are predominant at low bombarding energies. Since this is apparently not so for the reactions with (see above), the reaction may populate different states in than the reaction would populate; the reduced-width ratio would then not be the same as that extracted from the data with and targets.
- Received 18 March 1971
DOI:https://doi.org/10.1103/PhysRevC.4.98
©1971 American Physical Society
