Abstract
Background: Reactions that probe the compound nucleus structure of O near the and proton separation energies have important implications for nuclear astrophysics. New, more sensitive measurements of the reaction NO have motivated the need for improved compound-nucleus reaction data in other channels. A previous work [P. Tischhauser et al., Phys. Rev. C 79, 055803 (2009)] reported extensive -scattering data over the energy region from to MeV. During this experiment data for higher energies, from to MeV, were also recorded but were not analyzed. The unpublished data cover the excitation energy range from the proton separation energy at 12.13 MeV up to 13.31 MeV, the same energy range important for the reaction NO.
Purpose: These previously unpublished data for CC as well as the reactions CC and CN are analyzed in order to provide additional data for a comprehensive -matrix analysis of compound-nucleus reactions populating O.
Methods: Expanding on the previous publication's analysis, the ratio of the reaction yields was analyzed using a multiple-channel -matrix calculation.
Results: The excitation curves resolved resonances at (), 7.75 (2), 7.91 (1), 7.97 (3), and 8.13 (3) MeV. The -matrix analysis revealed excellent agreement between the measured yield ratios and cross-section data from the literature. The two 1 levels at and 7.91 MeV are those that dominate the NO cross section.
Conclusions: In a future publication, the additional constraints provided by these data will be used in a comprehensive multiple-channel -matrix analysis to investigate the low-energy cross section of the reaction NO.
5 More- Received 22 February 2012
DOI:https://doi.org/10.1103/PhysRevC.85.045804
©2012 American Physical Society