Observations on cosmic abundance of He4 and Li7, comparison with primordial nucleosynthesis predictions

Details Observations on cosmic abundance of He4 and Li7, comparison with primordial nucleosynthesis predictions Observations on cosmic abundance of He4 and Li7, comparison with primordial nucleosynthesis predictions

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.283...69c&link_type=abstract

In ESA, Space Science and Fundamental Physics p 69-74 (SEE N89-11638 02-88)

Physics

Abundance, Cosmochemistry, Helium Isotopes, Lithium Isotopes, Nuclear Fusion, Astronomical Models, Big Bang Cosmology, Subdwarf Stars

Scientific paper

Observations of He-4 in metal poor galaxies and of Li-7 in galactic subdwarfs were used to derive constraints on the initial abundances of the elements. An initial abundance of He-4 of 0.23 to 0.24 by mass, and an initial abundance of 10 to the minus 10th power by number of atoms for Li-7, with respect to hydrogen are obtained. These abundances are compatible with a hot big bang having a nucleons/photons ratio of about 2 to 5 times 10 to the minus 10th power, assuming 3 families of particles.

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