Abstract
A short review on fermion masses is needed in order to understand the implication of the majoron model arising from neutrino oscillations. The spectrum recorded in recent experiments is consistent with the emission of a heavy neutrino of mass about 17.1 keV and the mixing probability is about 3%. This phenomenon is explained in the framework of the majoron model. The existence of the new-physics scale at 1010 GeV could be the only possibility to discover the majoron in laboratory experiments through flavour-changing reactions K→πf and μ→ef. One further generation of rare kaon and pion decay searches suffice to test the model.
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