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Forum: Physics List
Date: 12 Feb, 2009
From: Kent Wong <Kent Wong>

Hello,

 I am a physics graduate student from Northern Illinois University at the NICADD (Northern Illinois Center of Accelerator and Detector Development) and I am working on my thesis where I implement Geant4.9.1 via Cygwin to simulate 200 MeV protons through a air-bone-water phantom. My thesis is on proton Computed Tomography. My physics advisor addressed an issue to me weeks ago:

When people talk about energy loss, they think about the combined effect of two things: one is governed by the Bethe-Bloch equation (the average energy loss, which is a deterministic effect) and the other by equations derived by Bohr, Tschalar, etc. (the energy loss straggling, which is a stochastic effect that gives a distribution around the average loss). I want to turn off only the second effect (the stochastic part) and keep the first (the deterministic part).

   He wants to turn off only the energy loss due to straggling, but I don't know how to do it on the PhysicsList.
 I've attached my PhysicsList.cc. My guess is to comment out HadNuclearProcess class but I'm not sure.

Thanks for helping, Kent

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2009/02/12/20.41-71768-P_code_src_PhysicsList.cc

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1 Idea: Re: Turning off Energy loss due to Straggling   (Vladimir Ivanchenko - 15 Feb, 2009)
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