Time of primordial Be-7 conversion into Li-7, energy release and doublet of narrow cosmological neutrino lines

Details Time of primordial Be-7 conversion into Li-7, energy release and doublet of narrow cosmological neutrino lines Time of primordial Be-7 conversion into Li-7, energy release and doublet of narrow cosmological neutrino lines

2010-09-20

arxiv.org/abs/1009.3932v2

Astronomy Letters 37, 367 (2011)

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Minor typos corrected

Scientific paper

10.1134/S1063773711060041

One of the important light elements created during the big bang nucleosynthesis is Be-7 which then decays to Li-7 by electron capture when recombination becomes effective but well before the Saha equilibrium recombination is reached. This means that Be-7 should wait until its recombination epoch even though the half-life of the hydrogenic beryllium atom is only 106.4 days. We calculate when the conversion from primordial Be-7 to Li-7 occurs taking into account the population of the hyperfine structure sublevels and solving the kinetic equations for recombination, photoionization and conversion rate. We also calculate the energies and the spectrum of narrow neutrino doublet lines resulting from Be-7 decay.

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