Measurements of d(d,p)t and d(d,n)^3He Total Cross Sections at Big-Bang Nucleosynthesis (BBN) Energies

Details Measurements of d(d,p)t and d(d,n)^3He Total Cross Sections at Big-Bang Nucleosynthesis (BBN) Energies Measurements of d(d,p)t and d(d,n)^3He Total Cross Sections at Big-Bang Nucleosynthesis (BBN) Energies

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apr.x7009l&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

Big Bang Nucleosynthesis is well described by a small number of reactions. The outcome of BBN is determined almost entirely by the nuclear reaction rates and the baryon to photon ratio, η, of the Universe. By measuring key cross sections, one can adjust η to reproduce the current measured values of primordial elemental abundances. In the past, quantitative understanding of BBN has been limited by uncertainties in the primordial abundances. Recent measurements of primordial deuterium abundances (D/H)p footnote D. Tytler et al., Physica Scripta, 85, 12 (2000). have now made the nuclear reaction rates a limiting factor. The d(d,p)t and d(d,n)^3He cross-sections contribute significantly to the (D/H)p uncertainties predicted by the network calculations (for a specified value of η) footnote S. Burles et al., Phys. Rev. Lett. 82, 4176 (1999).. We have measured total cross-sections for these reactions at lab energies in the range of 480 to 660 keV. The experiments are performed using the mini-tandem accelerator and high voltage chamber at TUNL footnote T. C. Black, Nucl. Instr. and Methods A333, 239 (1993). . We aim at limiting the total errors to less than two percent throughout the relevant BBN lab-energy range of 100 to 700 keV. This is more than a factor of three improvement over existing data.

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