In message <CAL8XPmO_T-R1y=qumswtunhdnme0seti+6xtdgww4jdvz2j...@mail.gmail.com>
, Azelio Boriani writes:

>More: are neutrinos supposed to travel from CERN to Gran Sasso via what? 

Via solid rock.

>Is there a 730Km long empty pipe [...]

No, and you'd need one to actually try the same distance with photons.

The complication is that the solid rock path is actually used as sort
of a filter for the neutrinos, nothing else goes through 730km bedrock
so if you see anything coming from that direction, you can be pretty
certain that it is neutrinos.


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