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Question A question about photon evaporation followed by neutron capture 

Forum: Hadronic Processes
Date: 24 May, 2010
From: Victor_Makarov <Victor_Makarov>

Hello everybody. I've got a question concerning gamma emission following neutron capture. If I understand right, when we don't use flag G4NEUTRONHP_USE_ONLY_PHOTONEVAPORATION, to calculate energies of gamma G4 uses data for continuous energy distribution stored in /Capture/FS folder. The data includes probability for each energetic range. If we use the flag G4NEUTRONHP_USE_ONLY_PHOTONEVAPORATION, then G4 goes to PhotonEvaporation for discrete levels and corresponding gamma energies. I examined the format of PhotonEvaporation file and see that it has 17 columns. If I understand right, from 1st to 6th columns are: level, gamma energy, relative intensity of energy inside current level,?, half-life,J; 7-17 columns give ratio of internal conversion and internal conversion coefficients. My question is - how does G4 calculate the probability for this or that discrete level of the excited nucleus? It seems there is no information about that in PhotonEvaporation data file. The relative intensity is given only for gamma energies inside level. But how does Geant4 calculate the energy of the excited nucleus for neutron capture reaction if flag G4NEUTRONHP_USE_ONLY_PHOTONEVAPORATION is turned on? Any help will be much appreciated. Thank you.

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