a Search for Structure in the Scattering of Carbon -12 by NEON-20 and Natural Parity States in NEON-20 Observed in the Scattering of Alpha Particles by OXYGEN-16.
We report the elastic scattering of ('12)C by ('20)Ne and the inelastic scattering to the first excited state in ('20)Ne in 100 keV steps for 20 (LESSTHEQ) E(,C,lab) (LESSTHEQ) 33 MeV. Surface barrier detectors at sixteen angles in a differentially pumped gas chamber measured simultaneously the differential cross sections. We observe broad maxima in the excitation functions at several angles in both the elastic and inelastic channels. In addition, we report the elastic scattering of ('12)C by ('22)Ne over the same energy range. The ('12)C + ('22)Ne excitation functions do not show the same type of structure as ('12)C + ('20)Ne. We also report the analysis of previously published data on ('16)O((alpha),(alpha)(,O))('16)O and ('16)O((alpha),(alpha)(,1))('16)O in terms of resonances in the compound nucleus, ('20)Ne. Treating the scattering amplitude as a linearly energy dependent nonresonant term plus a sum over resonant partial waves, we extracted resonant energies, widths, and branching ratios for resonances of both reactions. Our analysis of these reactions yielded a total of 58 natural parity levels in ('20)Ne at excitation energies from 16.5 to 21.1 MeV. We also discuss some of the limitations of this analysis method, particularly in regard to its earlier uses.
- Pub Date:
- Physics: Nuclear