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Alex,
I think to make this thought experiment work you would also need to know (or approximate) the flux density.
That is how many of your 'particles' are travelling in a given direction over a specified period of time.
Then, in terms of the energy you want to calculate, not all of these particles could ever be made to give up all or any of their energy.
Most neutrinos will travel unhindered through a block of solid lead 1,000 light years thick !
Rally
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