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The discovery of neutrino oscillations invites many fundamental physicsquestions that have yet to be answered. Two of these questions are simple, easyto state, and essential: What are the values of the neutrino masses? Areneutrinos Majorana fermions? The reason we don't know the answer to thosequestions is that it is difficult to measure neutrino properties outside of theultrarelativistic regime. We discuss the physics of $e\gamma\to e\nu\bar{\nu}$near threshold, where one has access to nonrelativistic neutrinos and onlynonrelativistic neutrinos. Near threshold, $e\gamma\to e\nu\bar{\nu}$ is a richphenomenon and its cross section is sensitive to the individual values of theneutrino masses and the nature of the neutrinos. We show that if one could scanthe threshold region, it would be simple to identify the mass of the lightestneutrino, the neutrino mass ordering, and whether the neutrinos are Majoranafermions. In practice, however, event rates are tiny and backgrounds are huge;the observation of $e\gamma\to e\nu\bar{\nu}$ in the sub-eV regime appears tobe utterly inaccessible in the laboratory. Our results, nonetheless,effectively illustrate the discriminatory power of nonrelativistic neutrinoobservables.

Shining Light on the Mass Scale and Nature of Neutrinos with $e\gamma \to e\nu\overline{\nu}$