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Forum: Space Applications
Re: Question Define "differential energy spectrum" (Geng)
Date: 12 Mar, 2012
From: michel maire <michel maire>

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

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