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Question Also Problems with Muon Capture 

Keywords: Muon capture
Forum: Particles
Date: 27 Jun, 2005
From: Teresa Marrodan Undagoitia <tmarroda@ph.tum.de>

Hi! Im also having problem with muon captured. I produce muon minus in a liquid scintillator detector, (Carbon and Hydrogen). The muons make ionization processes and once they are at rest they are captured by carbon (Globaltime ~3ns).

Looking at the bibliography I found that in carbon the muons (most of them) should decay before they make the reaction:

12C + mu -> 12B + neutrino (*)

because their lifetime is ~2 microseconds and the nuclear absorption (*) happens at ~20 miliseconds.

In my simulation it works, usually the muon decays before it makes the nuclear absorption. I see electrons and gammas from the electromagnetic cascade (produced at ~3- 4 ns Globaltime) and then the two neutrinos and the electron from the decay. The neutrinos are produced at the time expected, ~ 2.2 microseconds (~2200 ns globaltime) after the production of the muon. BUT the electron from the decay is produced at GLOBALTIME ~3ns!!!

This produced of course a wrong signal in my detector because the optical photons that this electron produced arrive at the wrong time. I was looking at the code where that is implemented:

G4StopElementSelector.cc

G4MuonMinusCaptureAtRest.cc

G4MuMinusCaptureCascade.cc

and I can not found where is the problem.

Maybe someone have an idea? Thank you!

Teresa Marrodan

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1 Feedback: Re: Also Problems with Muon Capture   (Peter Gumplinger - 27 Jun, 2005)
(_ None: Problems with Muon Capture solved!   (Teresa Marrodan Undagoitia - 29 Jun, 2005)
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