Oscillations of the neutrinos
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When a nu_e neutrino is produced in the core of the sun, it can along
its way to the earth change into an other neutrino type: nu_mu for instance.
If, along its way, we could detect it, we would have 1 chance over 10, then 3
chances over 10, then 5 chances over 10, etc... to detect a nu_mu instead
of a nu_e.
It is the neutrinos oscillation.
And it could explain why we detect on the earth almost twice as less neutrinos
as was is theorically produced in the sun.
Last update: 26/06/1999 : http://wwwlapp.in2p3.fr/neutrinos/aoscillanim.html