Statistics – Applications
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001phdt.........9d&link_type=abstract
Thesis (PhD). UNIVERSITY OF NOTRE DAME, Source DAI-B 62/01, p. 314, Jul 2001, 141 pages.
Statistics
Applications
Scientific paper
This work concentrates oil the applications of elastic scattering data for determining the 26Mg(α,α)26Mg and 13C(α,α)13C reactions. These were done using two experimental setups specifically designed for alpha-scattering here at Notre Dame, one using the FN Tandem accelerator and the large 45″ Notre Dame FN scattering chamber, and the other with the KN Van De Graaff accelerator and 16″ Ortec chamber. The purpose was to gain information on the related reactions 26Mg(α, n)29Si and 13C(α,n) 16O, which are inconclusively known. The first reaction is of interest, in testing Type II Supernovae models against experimental evidence from dust grains found in meteorites, and the second is a likely neutron source for the main branch of the s-process nucleosynthesis in stars. I will describe setup, astrophysical motivation, and the method of extracting relevant level parameters from the elastic scattering reactions using multi-channel R-matrix theory, and show that more information is needed on these reactions by demonstrating that the parameters from past data do not fully explain the experimental results presented here. I intend to show that alpha scattering is a valuable tool to approach astrophysically interesting reactions which are difficult to measure directly.
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