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Question Simulation of mean muon lifetime in various materials 

Forum: Hadronic Processes
Date: 22 Jul, 2013
From: Matt McIntyre <Matt McIntyre>

I've written a simulation to calculate the mean lifetime of negative muons in various materials. It consists of a monoenergetic, isotropic point source of negative muons that is centered in a solid sphere of material (e.g., Be, Fe, Hg). There is also a detector volume whose material is defined as a vacuum, and a world volume whose material is air. I'm using Geant4 9.6.p02 with the internal CLHEP, my physics list is QGSP_BERT.

Unfortunately, after running the simulation, my muon time histogram appears as a Gaussian distribution rather than a decaying exponential. Additionally, the muon times and how often the muMinusCaptureAtRest process is called, changes with energy. For example running with a 7 MeV energy yields a mean of 238 ns, but running with 60 MeV gives 800 ns, and any energy above 60 MeV yields almost no muon captures. None of these results agree with the experimental data I have available, and I'm not sure where the problem is.

Thank you for your time and help,

Matt

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