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Question problem with radioactive decay of 235U 

Forum: Hadronic Processes
Date: 23 Aug, 2012
From: Susana Cebrian <Susana Cebrian>

Hello, I have encountered a problem when simulating the radioactive decay of 235U using G4RadioactiveDecay, which may be similar to those I reported in this forum (post #1147) and as a bug report at, in the sense that I do not obtain the emissions I expect. In this case I am simulating for a large NaI detector 235U decays in an external component (photomultiplier). I enclose the registered energy spectrum for 10^6 decays of 235U, stopping the radioactive decay of the daughter. So I would expect to register no alpha emission, and for the gamma emissions, the most intense lines are, according to 235U decay scheme, those of 185.7 and 143.8 keV. However, in the registered spectrum the largest peaks are clearly those of 205 and 163 keV. I am using geant4.9.4.p01 version and I have checked at file /data/RadioactiveDecay3.3/z92.a235 that the probabilities of decay to the different excited states of the daughter nucleus are as I expect, so it seems that there could be some problem in the simulation of the daughter nucleus deexcitation. Thank you very much once more. Best regards, Susana Cebrian


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1 None: Re: problem with radioactive decay of 235U   (Laurent Desorgher - 02 Oct, 2012)
(_ Ok: Re: problem with radioactive decay of 235U   (Susana Cebrian - 02 Oct, 2012)
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