[time-nuts] Those pesky Neutrinos again...
michael.cook at sfr.fr
Mon Nov 21 04:06:12 EST 2011
Le 21/11/2011 09:49, Hal Murray a écrit :
> michael.cook at sfr.fr said:
>> I heard on the BBC the other day that a repeat experiment is planned,
>> firing neurinos from the US into Canada. The labs were not cited, but I
>> expect it would be Fermilab to Sudbury Ontario. If this is the case, then
>> there will still be the problem of not being able to run a parallel fibre
>> as the Sudbury detectors are also deep underground. ...
> I don't think that running a parallel fiber will help much. I see two
> First, fibers don't run in straight lines. Even if you could accurately
> survey the pipes in the ground, there is slack in the fiber within the cable
> bundle so it doesn't break if somebody pulls on the cable.
> Second, the speed of light in fibers isn't known to the required level of
> accuracy. (It's probably temperature dependent.)
I was thinking more of using fibre for determining the distance by
another method rather than for comparing the time of flight, and being
better than 18m over 740km would stretch the technology .
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