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Re: Question Geant4 Decay File 'Intensity' Column meaning? (Giuseppe Caporaso)
Date: 08 Jun, 2018
From: michel maire <michel maire>

On Thu, 07 Jun 2018 01:58:18 GMT, Giuseppe Caporaso wrote:
> 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.

 The file RadioactiveDecay/z63.a155 contains informations for beta decay of Eu155 on various excited states of Ga155
 Deexitation of such states is governed by the file PhotonEvaporation/z64.a155
 I suggest you to run example rdecay01 with attached macro and fullChain false or true


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