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Relic neutrinos from the early universe are predicted to have a relativelylarge number density, but extremely low energies. Hence, the only possibleinteraction proceeds via neutrino capture on beta-decaying nuclei. In caserelic neutrinos are captured by beta-decaying nuclei in the Sun, the neutrinosnormally emerging from the decay of these nuclei will be missing from theoverall number of solar neutrinos registered in neutrino experiments. Withinthe Sun, ${}^8\mathrm{B}$ and three nuclei from the CNO cycle are found to besuitable for this kind of process. Their cross section as well as the possibleimpact on the observed number of solar neutrinos are discussed. Assumingstandard neutrino oscillations, no deviations of neutrino flux measurementsfrom the predictions of the solar standard model are observed and upper limitsare derived accordingly.

Estimation of an Upper Limit on the Density of Relic Neutrinos in the Sun via the Solar $^8$B Neutrino Flux