Nucleosynthesis confronts an unstable, inert 17-keV state

Details Nucleosynthesis confronts an unstable, inert 17-keV state Nucleosynthesis confronts an unstable, inert 17-keV state

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phrvl..68..744e&link_type=abstract

Physical Review Letters (ISSN 0031-9007), vol. 68, Feb. 10, 1992, p. 744-747. Research supported by Magnus Ehrnrooth Foundation,

Mathematics

Logic

18

Cosmology, Neutrinos, Nuclear Fusion, Particle Energy, Radioactive Decay, Flux Density, Thermodynamic Equilibrium, Universe

Scientific paper

The cosmological consequences of an inert 17-keV state mixing with the electron neutrino are studied. The nucelosynthesis upper bound on the primordial helium abundance prohibits the existence of such a state, unless its lifetime falls into the range 6 x 10 exp -4 to 2 x 10 exp -2 s. In this range, the decay occurs after the chemical decoupling of the electron neutrinos and before the beginning of the nucleosynthesis, with the result that the predicted helium abundance can be lower than what it would be in the standard scenario.

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