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Question problems with G4RadioactiveDecay in geant4.9.6 

Forum: Hadronic Processes
Date: 14 Oct, 2013
From: Susana Cebrian <Susana Cebrian>

Dear all, I have encountered using geant4.9.6.p02 version the same problem reported at messages #1260 by Andrew Brown, which I think is still unsolved. For the 210Pb decay, energy from the deexcitation of the 46.5 keV excited state of the daughter nucleus seems to be missed. However, when using previous version geant4.9.4.p01 I checked that this decay was correctly simulated, although I found some problems for other beta decays with low transition energy Q, which in the end could be be managed (see messages #1147 and bug report http://bugzilla-geant4.kek.jp/show_bug.cgi?id=1186). In the context of experiments of direct detection of dark matter demanding an energy thresold at the keV level and for emissions produced inside the detector itself, the proper simulation of the emitted gamma and X rays and electrons from the deexcitations is important.

I attach the comparison of the energy spectra I obtained with different versions simulating the 210Pb decay in an ideal detector saving all the released energy, which looks very similar to Andrew's plot. There have been changes in the treatment of nuclear or atomic deexcitations throughout the versions which could be producing this effect?

Thanks a lot and best regards, Susana Cebrian

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2013/10/14/04.21-34414-t4.9.6.p02_pb210decay.pdf

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