Dear Sir, I am trying to use GEANT4 to simulate the Gamma-ray produced via nuclear reactions induced by ~50 MeV proton, such as p + C12 etc. I found some cross-sections for this kind of reactions from Dyer's paper (Phys. ReV. C. 1981, Vol. 23, p. 1865). I am not sure wether current GEANT4 (such as 7.1 or 8.0) has token that into account or not. Could you let me know wether GEANT4 includes this kinds of reaction or not? If not, could I add those cross sections in a simulation with GEANT4? Thanks -- FENG,YUXIN
Geant4 does have some discrete gamma levels, but I'm not sure that all those seen in the Dyer paper are included. Please try simulating p + 12C using the Precompound model, and remember to setenv G4LEVELGAMMADATA to the location of the file PhotonEvaporation2.0 which you can download from the Geant4 webpage. If the lines are not there, then you will have to make your own (p,gamma) cross section class. This can be done by deriving from G4VCrossSectionDataSet.hh, implementing the IsApplicable and GetCrossSection methods, and then assigning it to the proton process with the AddDataSet method. Examples of such specialized cross section sets are found in geant4/source/processes/hadronic/cross_sections
