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Forum: Physics List
Re: Question Physics list problem? inelastic gamma rays (n, n'gamma) are missing (John McFee)
Re: Idea Re: Physics list problem? inelastic gamma rays (n, n'gamma) are missing (Vladimir Ivanchenko)
Date: 27 Nov, 2013
From: John McFee <John McFee>

Thank you for replying. I'm sorry for the confusion. I phrased my question poorly. I have tried both methods of declaring the physics list, registering QGSP_BERT_HP (or QGSP_BIC_HP) through

runManager->SetUserInitialization(new QGSP_BERT_HP); or runManager->SetUserInitialization(new QGSP_BIC_HP);

or else my own physics list as shown in my post, but I only use one method in a given run. I get the same results for all three.

Also, as I alluded to, I am generating a sufficient number of neutrons to get clear thermal neutron peaks in my gamma spectrum, but not a single neutron inelastic gamma ray, even though the cross section for the latter is roughly 50 times greater than that of the latter for C12. I've attached a gamma ray spectrum (energy in MeV) for 250 million 14MeV neutrons incident on a C12 target in vacuum. The histogram is for vertex gamma rays produced (so no losses due to scatter, etc.). Three lines are seen, all corresponding to thermal capture lines (a few other capture lines are absent). There is not a single count at or near the 4.43 12C(n,n'gamma) line.

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2013/11/27/10.38-58993-14MeVneutrons_BERT_HP.png

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1 Idea: Re: Physics list problem? inelastic gamma rays (n, n'gamma) are missing   (Vladimir Ivanchenko - 13 Dec, 2013)
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