Statistics – Computation
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004phdt.........4l&link_type=abstract
Thesis (PhD). THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL, Source DAI-B 65/04, p. 1932, Oct 2004, 117 pages.
Statistics
Computation
2
Scientific paper
Recent WMAP measurements have determined the baryon density of the Universe Ω b with a precision of about 4%. With Ωb as an input, comparisons of Big Bang Nucleosynthesis (BBN) network predictions to primordial abundance observations can be made and used to test BBN models and/or to further constrain abundances of isotopes with weak observational limits. To push the limits and improve constraints on BBN models, uncertainties in key nuclear reaction rates must be minimized. To this end, we used the TUNL Mini-Tandem and High-Voltage Target Chamber to make new precise measurements of the d(d,p)t and d(d,n)3He total cross sections. In order to use this new data to constrain Standard Big- Bang Nucleosynthesis, the uncertainties in the results, as well as the uncertainty correlations between the data for various energies and the two reactions, must be well understood. A complete fit was performed in energy and angle to both angular distribution and normalization data for both reactions simultaneously. By constructing a realistic fit with parameters for experimental variables such as target thicknesses and solid angles, error correlations between detectors, reactions, and reaction energies were accurately tabulated by computational methods. Our new measurements significantly improve on the existing data set. The reaction rates calculated from our data are significantly higher than those in the widely used NACRE compilation. These data will thus lead not only to reduced uncertainties, but also to modifications in the BBN abundance predictions.
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