Faster than light?

Bloody technicalities, hey! ::slight_smile:

Rigil

Absolutely correct. Unlike photons, neutrinos interact with matter only very, very weakly. I remember a factoid from undergraduate physics lectures that to have a 1% chance of stopping a given neutrino, you would need a lead shield about 12,000 km thick (i.e. roughly the diameter of the Earth). Lead atoms have the greatest known atomic cross-section for capturing radiation, which is why it is used for radioactive shielding.

If you are now wondering how the neutrinos are detected at the target end, you’ll have some idea of how technically challenging these experiments are. In simple terms, the answer is in generating neutrino bursts numbering quadrillions of neutrinos (which requires lots of energy) and looking for particular types of subatomic events at the detector, after which a range of subtle statistical techniques come into the analysis.

'Luthon64

Oh crap sorry tweefo. I should have searched the forum. I created a post about it also. I will see if I can delete mine.