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Question Geant4 Decay File 'Intensity' Column meaning? 

Forum: Particles
Date: 06 Jun, 2018
From: Giuseppe Caporaso <Giuseppe Caporaso>

Hi all,

I'm trying to simulate the photon decay spectrum of Eu155 in Geant4. I made a plot of geant4's resulting spectra from using /gps/ion <Z> <A> (the plot also shows what the spectrum should approximately look like) and it doesn't match up frequency wise with what other literature states. I've attached all these.

What I want to know is how the intensity column works and how to adjust it such that the fractional decays of the photons aligns with the literature.

From what I can gather so far, the intensity listed in the G4 Decay file is the probability of reaching that excited Gd155 State. So then how do the photon probabilities factor in? I feel like this situation would similarly apply to other radioactive isotopes, did anyone encounter this and possibly find a work around?

So far my work around has been 'trial and error' i.e put in all the photon energies and guess intensity numbers until the spectrum comes out how I want it to. As you can imagine its quite laborious and unpredictable. I've attached that file too (Eu155_z63.a155).

Any help is greatly appreciated.

Thanks, - Giuseppe

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2018/06/06/17.31-93648-55_spectra_compare1.png
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2018/06/06/17.31-54162-z63.a155
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2018/06/06/17.31-62507-Eu155_z63.a155
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2018/06/06/17.35-49415-Eu-155_tables.pdf

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1 None: Re: Geant4 Decay File 'Intensity' Column meaning?   (michel maire - 08 Jun, 2018)
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