Heavy ion resonances in the ('12)C + ('12)C system were investigated with an optical model plus multi-level resonance (OMMR) analysis. Elastic scattering excitation function cross sections were measured for 12 angles between 17.1(DEGREES) and 90.0(DEGREES) for energies between 17.5 Mev and 21.5 Mev in 100 keV intervals (in the center of mass system). The total reaction cross section data were measured at intervals of 100 keV for energies between 17.5 and 21.5 MeV. Analysis of the elastic scattering data including cross section data measured at six angles corresponding to zeros of Legendre polynomials provided spin determinations for four resonances located at 18.2, 19.2 and 20.2 MeV. The resonances at 18.2 and 19.2 MeV were determined to have spins = 12. The two resonances located at 20.2 MeV were determined to have spins of 12 and 14. / For the OMMR analysis, four resonance terms were added to a smoothly varying background which was described by the optical model. The optical model potential which best described the elastic scattering cross section data and the total reaction cross section data had a Woods-Saxon squared real plus Woods-Saxon imaginary form. Several other common potential forms were tested but they resulted in a poorer description of the data. The background absorption for the L = 12 partial wave at 19.2 MeV, which was calculated using the parameters obtained from the elastic scattering analysis, lead to an L = 12 partial wave which was nearly fully absorbed. However, comparisons of the calculated total reaction cross section with the data indicates that the background absorption must be considerably smaller than this. / Source: Dissertation Abstracts International, Volume: 48-03, Section: B, page: 0801. / Thesis (Ph.D.)--The Florida State University, 1987.
| Identifer | oai:union.ndltd.org:fsu.edu/oai:fsu.digital.flvc.org:fsu_76096 |
| Contributors | PARKER, RONALD ALAN., Florida State University |
| Source Sets | Florida State University |
| Detected Language | English |
| Type | Text |
| Format | 240 p. |
| Rights | On campus use only. |
| Relation | Dissertation Abstracts International |
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