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Furry stated the transition probability to even be higher for double beta decay in Majorana's symmetrical theory of the neutrino when compared with the original Dirac-Fermi theory. The privative label "neutrino-less" appeared in 1953 and largely replaced the original terminology. This theoretical decay was the first idea proposed which could be used to search for the violation of lepton number conservation. It has, since then, drawn attention for being useful to study the nature of neutrinos (see

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