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Forum: Hadronic Processes
Re: Sad Wrong gamma spectrum of Yb-169 with rdecay01 example (Alexey Solovyev)
Date: 24 Oct, 2015
From: michel maire <michel maire>

On Fri, 23 Oct 2015 11:10:03 GMT, Alexey Solovyev wrote:
> I tried to simulate Yb-169 decay using rdecay01 example (/gun/ion 70
> 169) and got the following spectrum (see attachment). There is strong
> line at about 63 keV as intended, but all another lines seems wrong -
> next top line at about 300 keV and lines at e.g. at 109, 130, 177, 197
> keV are almost zero. This doesn't correspond to any data I found: nor
> measured (LBNL, LANL, ENSDF, RIAR), nor recommended (ICRU, TORI), nor
> even data at CERN website (
> https://espace.cern.ch/ICTR-PHE2012-slides/Session%202%20Radioisotopes%20in%20diagnostics%20and%20therapy/akulinichev_cern_2012.pdf
> ).
> 
> Tried to use Geant4-10.0, Geant4-10.1.p02 both on Windows and Linux with
> RadioactiveDecay 3.2, 3.6, 4.0, 4.2 (almost all combinations). Some
> differences between them also found but the main case still persists:
> all the upper lines except 63 keV seems to be wrong.
> 
> While trying to figure what happens also found that turning some options
> inside PhysicsList of rdecay01 example resulting in slight shift of
> lines (see _dcOptions attachement). As I may suggest, the wrong part is
> somewhere inside the excitation of 169Tm[...] mechanisms.
> 

   Concerning gamma deexcitation, Geant4 10.1 is basically wrong, even patched.
   In attachment, gamma and electron spectrums (arm off) within 10.2 beta.
   Please, tell us if this is more close of what you expect. If not,  PhotonEvaporation3.1/z69.a169 must be modified

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2015/10/24/10.31-40887-Yb169.mac.txt
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2015/10/24/10.31-82570-gamma.gif
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2015/10/24/10.31-43750-electron.gif

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1 None: Re: Wrong gamma spectrum of Yb-169 with rdecay01 example   (Alexey Solovyev - 26 Oct, 2015)
2 None: Re: Wrong gamma spectrum of Yb-169 with rdecay01 example   (Alexey Solovyev - 27 Oct, 2015)
1 None: Re: Wrong gamma spectrum of Yb-169 with rdecay01 example   (Alexey Solovyev - 27 Oct, 2015)
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