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Question Beta-decay spectrum shape  

Keywords: GEANT 4.7.0, beta-spectrum, GenaralParticleSource
Forum: Particles
Date: 10 Nov, 2005
From: Ilya <ilya.kraev@fys.kuleuven.ac.be>

Hello,

I'm making simulation of the 60Co beta-decay and I have the question concerning the way how the 60Co spectrum is generated in GEANT. I'm using G4GeneralParticleSource to simulate the decay. The shape I obtain is different from what I see in the experiment and also from the one I found on the Lund/LBNL website (http://nucleardata.nuclear.lu.se/nucleardata/toi/). The biggest difference is in the energy region below 70 keV. At this energy spectrum generated with GEANT has a maximum while spectrum from Lund/LBNL database goes up continiously to the lowest energy. The average energy of the beta-decay for the GEANT-generated spectrum is also about 10 keV higher than the one that can be found in databases.

The question is what causes such a difference and how precise is the spectrum below 100 keV?

I tried to find some formulas and theoretical description put into the basis of beta-spectrum generated in GEANT but there is not enough information available in all GEANT documentation. If somebody could provide some references on this topic that would be really great.

Thanks a lot, Ilya.

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