Nuclear Reaction Rates and Primordial $^6$Li

Details Nuclear Reaction Rates and Primordial $^6$Li Nuclear Reaction Rates and Primordial $^6$Li

1996-12-19

arxiv.org/abs/astro-ph/9612197v1

Phys.Rev.C56:1144-1151,1997

Astronomy and Astrophysics

Astrophysics

10 pages, REVTeX, 5 PostScript figures with psfig. Submitted to Physical Review C

Scientific paper

10.1103/PhysRevC.56.1144

We examine the possibility that Big Bang Nucleosynthesis (BBN) may produce non-trivial amounts of $^6$Li. If a primordial component of this isotope could be observed, it would provide a new fundamental test of Big-Bang cosmology, as well as new constraints on the baryon density of the universe. At present, however, theoretical predictions of the primordial $^6$Li abundance are extremely uncertain due to difficulties in both theoretical estimates and experimental determinations of the deuterium-plus-alpha radiative capture reaction cross-section. We also argue that present observational capabilities do not yet allow the detection of primeval $^6$Li in very metal-poor stars of the galactic halo. However, if the critical cross section is towards the upper end of its plausible range, then improvements in $^6$Li detection capabilities may allow the establishment of $^6$Li as another product of BBN. It is also noted that a primordial $^6$Li detection could help resolve current concerns about the extragalactic D/H determination.

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