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Question Spikes in photo-neutron energy spectra 

Forum: Hadronic Processes
Date: Jul 20, 14:20
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 kinetic energy of neutrons produced by a natural lead target with primary particles of gammas at 8.998MeV. The neutrons are detected by a 4pi thin shell detector on the exit of the detector volume.

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

I produced the histogram by first reading in the kinetic energies into an external file, then reading it into ROOT and plotting.

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 Ok: RESOLVED   (Kyle Pastor - Jul 21, 09:51)
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to: "Spikes in photo-neutron energy spectra"

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