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Neutron Flux in Infinite Vaccum

  1. Feb 20, 2014 #1
    I have to figure out how to prove that the neutron flux for a point source is given by ø=[itex]\frac{S}{4πr^2}[/itex].

    I can get this type of solution, but I have an e^(-r/L) in the numerator. I'm assuming I'm missing some theory somewhere as apparently this is the solution for a point source in an infinite medium, not vacuum.

    does anyone have some insight they could offer?
     
  2. jcsd
  3. Feb 20, 2014 #2
    I realized theres no diffusion in a vacuum, therefore no diffusion coefficient. Please delete this post!
     
  4. Feb 20, 2014 #3

    mathman

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    The exponential term comes from neutron interactions with the medium. For a vacuum, L is infinite.
     
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