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Question Spikes in photo-neutron energy spectra  

Forum: Electromagnetic Processes
Date: Jul 20, 10:13
From: Kyle Pastor <Kyle Pastor>

Hello all,

I am currently simulating the creation of photo-neutrons in low Z materials for a mine detection application. In order to make sure the predefined physics lists are working (ex. QGSP_BERT_HP) I am first simulating high Z materials and checking to see if the neutron energies make sense. Attached is a histogram of the photo-neutron energy spectrum from natural lead with 8.998MeV incident gammas.

  Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2009/07/20/10.11-90665-t_8.998MeV_QGSP_BIC_HP.ps

The one thing that concerns me is the sharp spikes at what seems to be the ground state neutrons. I was wondering if anyone has any input for why this is occurring and/or if it is expected.

Thanks for any help,

-Kyle

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1 Idea: Re: Spikes in photo-neutron energy spectra   (Vladimir Ivanchenko - Jul 20, 12:33)
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