Measurement and Application of Nuclear Reactions

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Deuteron, Astrophysical Nucleosynthesis

Scientific paper

In this dissertation, we describe measurements of a class of nuclear reactions, which include the exothermic deuteron-induced reactions, primarily (d,p) and (d, alpha) reactions, on the nuclei ^7 Li, ^9Be, ^ {10}B and 11 B at deuteron energies from 50 keV to 170 keV and the ^7Li(^3He,p _0)^9Be(gs) reaction at bombarding energies around 160 keV. The angular distributions, cross sections and astrophysical S-factors are presented. The application of the measured S-factors for the ^7Li + d and ^7 Li(^3He,p_0) ^9Be(gs) reactions has been made to astrophysical nucleosynthesis. It has been proved that the (d, alpha) reaction on ^7Li has a more important contribution to the big-bang ^7Li destruction in the present energy region than those from the (d,p) and (d,n) reactions. With the two reaction networks, the ^9Be production in big-bang nucleosynthesis has been estimated and the 12C production in the sun has been calculated as an example of stellar nucleosynthesis. The measured cross sections of the ^9 Be + d, 10B + d and 11B + d reactions have been applied to the plasma diagnostics of the first wall contamination on the JET and TFTR tokamak fusion devices. The beryllium and boron contamination in the JET and TFTR tokamaks, respectively, can be obtained by use of the present cross sections together with gamma-ray measurements.

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