Abstract
The electron bremsstrählung induced, in a metallic detector, by relic neutrinos can be used to test the hypothesis of a big enhancement of the neutrino electromagnetic properties, suggested to explain the famous solar-neutrino puzzle. The problems connected with the presence in the above reaction of coherence effects are discussed. In particular, we show the strong suppression of the electromagnetic contributions occurring forE γ<10−4 eV due to the large value of the plasma frequence in a metal. To partially overcome this problem, the corresponding flavour-changing reaction has been considered. As a result, to obtain an experimental reasonable rate for the photon production, large values for magnetic-and/or electric-dipole momenta are required . A remarkable feature of the e.m.-dominated process is also the very small value of the asymmetry in the photon helicity, while the weak part would imply an effect of about 20%.
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