History of Neutrino

	Revision 11 . . November 22, 2001 5:20 am by Chenyu
	Revision 10 . . November 22, 2001 5:15 am by Cwitty [Removed paragraph with redundant information (it was garbled anyway)]
	Revision 9 . . November 22, 2001 4:35 am by (logged).93.53.xxx
	Revision 8 . . November 22, 2001 4:34 am by (logged).93.53.xxx
	Revision 7 . . November 20, 2001 7:34 pm by Andre Engels [explained cross section, added oscillations, detectors]
	Revision 6 . . November 20, 2001 1:45 pm by Chenyu
	Revision 5 . . October 6, 2001 2:38 am by DrBob [link to [[solar neutrino problem]]]

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It comes in three varieties, the electron neutrino νe, the muon neutrino νμ, and the tau neutrino ντ. The electron neutrino is by far the most common, the muon and tau neutrinos are much more massive and rare. Theoretical physicists believe that there is a possibility that neutrinos can 'oscillate' between the three types; however, this is only possible if the electron neutrino actually has non-zero mass, which is not yet known.

It comes in three varieties, the electron neutrino νe, the muon neutrino νμ, and the tau neutrino ντ. Theoretical physicists believe that there is a possibility that neutrinos can 'oscillate' between the three types; however, this is only possible if neutrinos have non-zero mass, which is not yet known. The question of neutrino mass also has cosmological significance. If the neutrino does have mass, then it could make up a signficant fraction of the mass of the universe and help resolve the dark matter problem.