We present the results of the observations performed in the occasion of the June 21 st , 2001 total solar eclipse, looking for visible photons emitted through a possible radiative decay of solar neutrinos. We establish lower limits for the ν 2 or ν 3 proper lifetimes τ 0 /m ≥ 10 3 s/eV, for neutrino masses larger than 10 −2 eV.
a b s t r a c tThe data collected during the 2006 total solar eclipse are analyzed in the search for signals produced by a hypothetical radiative decay of heavy neutrinos. In the absence of the expected light pattern, we extract lower limits for the heavy neutrino components proper lifetime. The present analysis restricts to the direct hierarchy hypothesis (m 3 ) m 2 > m 1 ). The quality of the data in terms of reached sensitivity suggests that those are the best limits obtainable using this technique.
We analyse the possibility of detecting visible photons from a hypothetical radiative decay of solar neutrinos. Our study is focused on the simulation of such measurements during total solar eclipses and it is based on the BP2000 Standard Solar Model and on the most recent experimental information concerning the neutrino properties. Our calculations yield the probabilities of the decays, the shapes of the visible signals and the spectral distributions of the expected photons, under the assumption that solar neutrino oscillations occur according to the LMA model.
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