Neutron Flux in Infinite Vaccum

  • #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?
 

Answers and Replies

  • #2
I realized theres no diffusion in a vacuum, therefore no diffusion coefficient. Please delete this post!
 
  • #3
mathman
Science Advisor
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The exponential term comes from neutron interactions with the medium. For a vacuum, L is infinite.
 

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