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The β-spectrum of 35 S has been measured with high statistical precision. A total of 2.2x10 10 events have been accumulated with a signal to background ratio of 10 3 or better. A systematic search for neutrino mixing has been performed for assumed neutrino masses up to 105keV. In the mass range 10 to 90keV, an upper limit around 10 -3 or less was set...
We show how the generation of a lepton number in the early universe induced by ν α ν s , in presence of small baryon number inhomogeneities, gives rise to the formation of lepton domains. The structure of these domains reflects the spectral features of the baryon number inhomogeneities that generated it and interestingly the size of the lepton domains can be super-horizon.
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