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Homework Help: Neutrino detection by inverse beta decay

  1. Oct 31, 2005 #1

    I have the following question: Neutrinos can be detected by an inverse beta-decay. The probability for an interaction of a neutrino and a proton is 10^(-43). How large should be a detector filled with water in order to let interact one of 1 million neutrinos with a proton? What would be the mass of the filling of the detector?

    I am not sure how to proceed. I know the number of protons in a water molecule but how can I get the dimensions of the detector from it? As for the mass filling?
    Shouldn't there be additional information as for example the interaction length of neutrinos, I mean how far they fly before interacting/annealing etc.?

    I would be grateful for every hint in the right direction.
  2. jcsd
  3. Oct 31, 2005 #2

    Physics Monkey

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    What is the mass density of water? How many protons are there per gram of water? Can you use these two numbers to find out the total number of protons in a volume of water?
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