Search for possible neutrino radiative decays during the 2001 total   solar eclipse
  We present the results of the observations performed in the occasion of the June 21, 2001 total solar eclipse, looking for visible photons emitted trough a possible radiative decay of solar neutrinos. We establish lower limits for the neutrino proper lifetimes larger than 1000 s/eV, for neutrino masses larger than 0.01 eV. 
S. Cecchini, D. Centomo, G. Giacomelli, R. Giacomelli, V. Popa, C.G.   Serbanut, R. Serra