Fourth neutrino gains support from old theory

July 1991
New Scientist;7/13/91, Vol. 131 Issue 1777, p22
Describes the development of a 'broken seesaw' mechanism to account for the existence of a neutrino with a mass of 17 keV. Claim that the neutrino theory would fit in with one of the favored explanations for the paucity of solar neutrinos reaching the Earth; Three varieties of neutrino associated with the three varieties of lepton.


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