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arXiv · 1001.5273

Interactions of keV sterile neutrinos with matter

Shin'ichiro Ando·Alexander Kusenko
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Abstract

A sterile neutrino with mass of several keV is a well-motivated dark-matter candidate, and it can also explain the observed velocities of pulsars via anisotropic emission of sterile neutrinos from a cooling neutron star. We discuss the interactions of such relic particles with matter and comment on the prospects of future direct detection experiments. A relic sterile neutrino can interact, via sterile-active mixing, with matter fermions by means of electroweak currents, with the final state containing a relativistic active neutrino. The recoil momentum impacted onto a matter fermion is determined by the sterile neutrino mass and is enough to ionize atoms and flip the spins of nuclei. While this suggests a possibility of direct experimental detection, we calculate the rates and show that building a realistic detector of the required size would be a daunting challenge.

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Shin'ichiro Ando, Alexander Kusenko. 2010-01-29. Interactions of keV sterile neutrinos with matter. https://doi.org/10.1103/physrevd.81.113006

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