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Question How to get secondary particle (e.g. muon) flux? 

Forum: Space Applications
Date: 15 May, 2012
From: Halil <Halil>

Hello Geant4 users;

I am working on the simulation of the cosmic muons using Geant4. I am trying to get flux at sea level using the primary particle flux which is given in unit (m2 sr s GeV)^-1 from balloon measurements. I shoot primary particles on the top of the atmosphere using GPS (general particle source) and record all the muonsí energy, angle etc. at sea level. The problem I am having is that I do not know how to express the muon's flux with the unit (cm2 sr s GeV)^-1.

Because of the possible scatterings and decays, muons spread a wide area at sea level with different angles. (For instance, when I shoot the protons vertically, muons reach the earth's surface with an angle in a range from 0 to 25 degree.) Therefore, I donít know wheter I should count all the muons reaching the sea level regardless of their angle or I sould do correction by dividing the total number by the detector area etc. Namely, how can I convert the number of muon events I obtained into the muon flux in proper units for a comparison with the measurements?

Thanks in advance

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