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Question Angular distribution of neutrons following a gamma-n reaction 

Forum: Hadronic Processes
Date: 20 Aug, 2018
From: filippo <filippo>

Hi,

I'm simulating a photons bremsstrahlung spectrum up to 15 MeV against a target made of lead (G4_Pb) and I'm collecting data about neutrons produced. Using:

track -> GetVertexMomentumDirection()

I obtain a vector representing x/y/z components of the momenta at track vertex. (more precise I obtain cosine of the angular components).

If I put my data in an histogram I obtain the attached plots for each component. I conclude that produced neutrons are almost isotropic.

The question is: is this behavior correct? In physics reference manual I can't find any explanation of the angular distribution of products after a photon-nuclear reaction.

browsing the forum I found almost the same question here but no clear answer: http://hypernews.slac.stanford.edu/HyperNews/geant4/get/hadronprocess/1220.html

Thank you and best regards

Filippo

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2018/08/20/13.24-86692-plot.png

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1 Idea: Re: Angular distribution of neutrons following a gamma-n reaction   (Vladimir Ivanchenko - 31 Oct, 2018)
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