Abstract
The cross sections for the reactions have been measured over the range of bombarding energies 0.441-2.45 MeV. The nonresonant portion of the cross section for the population of the 16.63-MeV level has been compared successfully with cross sections calculated on the assumption of an extranuclear direct-capture process. Resonant cross sections populating the 16.63- and 16.90-MeV levels of were measured at incident energies of 0.441, 1.03, and 1.89 MeV, corresponding to levels at 17.64, 18.15, and 18.9 MeV in . Partial widths and reduced matrix elements were calculated for the resonant contributions to the cross sections. The experimental results are consistent with the hypothesis of nearly maximal isobaric-spin mixing in the levels of (16.63 and 16.90 MeV). There is no evidence for transitions from the levels near 19 MeV to either of the 16-MeV states, but decay to these states was observed from a level (probably ) at 18.9 MeV.
- Received 19 June 1968
DOI:https://doi.org/10.1103/PhysRev.182.1007
©1969 American Physical Society