Effect of Relic Neutrino on Neutrino Pair Emission from Metastable Atoms

Abstract

A possiblity of measuring the cosmic neutrino temperature $\sim 1.9K$ and other important quantities such as the chemical potential $\mu$ and the decoupling temperature $T_d$ is discussed, using the recently proposed process of photon irradiated neutrino pair emission from metastable atoms. The Pauli blocking effect of relic neutrinos reduces the rate by a large factor $\approx (1+m_1/T_d)/4$ at the threshold of the lightest neutrino pair (of mass $2m_1$). Correction of linear order in $\mu$ near the mass thresholds can be used to improve the constraint on the lepton asymmetry.

arXiv comment12 pages and 6 figures

References in corpus (1)

• Neutrino Pair Emission from Excited Atoms

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