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On Sun, 11 Mar 2012 16:43:54 GMT, Geng wrote:
> Hi Sir/madam > > Thanks in advance! > I am a fresh man in Geant4.I want to simulate a source with a "differential energy spectrum" , just like a GCR proton spectrum. > Could you give me some advice to solute it? > I need your suggestions urgently! > Thanks very much! > Geng >
I do not know what you call differential energy spectrum, nor GCR proton spectrum. If you mean generate particles according a predefined distribution, you may use General Particle Source, as mentioned by Susanna. You may also do it yourself with simple particle gun. This is shown in : examples/extended/eventgenerator/particleGun See readme and PrimaryGeneratorAction2