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Question Missing C-12 gamma spectrum peak 

Keywords: Gamma spectrum, precompound model, carbon, physics list
Forum: Hadronic Processes
Date: 11 Jan, 2008
From: Steve Peterson <Steve Peterson>

I have been looking at the gamma spectrum produced by 30 MeV protons hitting a thin (2mm) C-12 target and don't see the expected peaks, primarily the 4.43 MeV peak. I have been using the physics list from the Hadrontherapy example, including the low-energy em physics and the precompound model. I also tried the Bertini cascade model, but that was not any better. I am wondering if anyone else has seen this problem or if there is something that I am missing in the physics list. Thanks for your help, Steve

Other details: I am using Geant4 8.1.p01 and tallying the gamma flux around the target using root. Specific macro physics list commands: photon-epdl, electron-eedl, ion-LowE, positron-standard, muon-standard, proton-precompound.

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1 None: Re: Missing C-12 gamma spectrum peak   (Victor_Makarov - 14 Jan, 2008)
1 Note: Re: Missing C-12 gamma spectrum peak   (Gunter Folger - 14 Jan, 2008)
3 Feedback: Re: Missing C-12 gamma spectrum peak   (Gunter Folger - 14 Jan, 2008)
1 None: Re: Missing C-12 gamma spectrum peak   (Steve Peterson - 17 Jan, 2008)
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