Gli esperimenti sui neutrini

Two experiments:

	CHORUS
	NOMAD

running at the CERN SPS accelerator, have been designed to throw light on some of nature's most elusive particles: neutrinos. Massless as far as we can tell, neutrinos can pass through the Earth without noticing it is there. Yet should they have even a tiny mass they could hold the key to two most intriguing puzzles: sunshine and dark matter. Experiments detect only a fraction of the huge number of neutrinos, which, according to theory, should be streaming out of the Sun towards us. Is something happening to them on the way? Do they change identity, "oscillating" into different kinds of neutrino which the detectors can't see? And what about dark matter? We know that only 10% of all massive objects are visible, so what of the other 90%? Could some or even all of it be made of neutrinos?