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None O16(g,alpha)C12 Cross Section 

Forum: Hadronic Processes
Date: 25 Mar, 2013
From: Riad Suleiman <Riad Suleiman>

 Dear All,

Here at JLab, we want to study the reaction:
  gamma + O16 --> alpha + C12,   Q = -7.1972 MeV

  The cross section used in Geant4 is shown in the first attachment. I used a
 mono-chromatic gammas, measured the number of alphas generated and calculated
 the cross section. The Photon Inelastic model was CHIPSGammaNuclear. However,
 BertiniCascade model used in example Hadr03 shows similar jumps.

  I want to use a more realistic one from ENDF, shown in the second attachment.
 Is it possible to get some advice on how to proceed. One might think that the
 easiest way is to edit the numbers Geant4 is using (where can I find these
 numbers?).

  Thank you very much,

  Riad.

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2013/03/25/11.31-57218-Geant4_csO16.gif
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2013/03/25/11.31-79512-ENDF_plot.png

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