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From experimental results on the shape of the upper portion of the continuous β ray spectra of thorium C and thorium C″ the distribution of energy is deduced. This distribution is compared with Fermi's theory wherein the shape of the curve depends on the mass of the neutrino. The comparison supports Fermi's conclusion that the mass of the neutrino is zero or certainly not more than a very small fraction of the electronic mass.
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W. J. Henderson (1935) studied this question.
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