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Forum: Hadronic Processes
Re: Question Apparent undocumented change to Th231 (z90.a231) in PhotonEvaporation (Guangyong Koh)
Date: 18 Dec, 2016
From: Laurent Desorgher <Laurent Desorgher>

Dear Guangyong Koh,

As mentioned by Dennis the problem occurs when changing format. But it has been already corrected in the PhotonEvaporation 4.3/gamma_correlated data that is now used by default in radioactive decay. There was a need to restore the old PhotonEvaporation 3.2 data in the PhotonEvaporation 4.3 for other process using photon_evaporation. This duplication of the data will be removed probably with the next patch. But again for radioactive decay the correct data PhotonEvaporation 4.3/gamma_correlated should be used in Geant4.10.3. Please check it an tell me if a problem occur in your output. The Th231 have been corrected in PhotonEvaporation 4.3 according to DDEP data ( This is the reference I am using now when correcting/updating data. This is already documented in the History file of the database.

Best regards


On Tue, 13 Dec 2016 02:27:52 GMT, gkoh wrote:

> Hi,
> There seems to be an issue with Th231 (z90.a231) in recent versions of
> PhotonEvaporation. Below is my documentation of the problem.
> Feb 2006&#65533;Issue first raised here (
> ).
> Nov 2012&#65533;Geant4 9.6 / PhotonEvaporation.2.3 z90.a231 updated. Agrees
> with fix proposed above. 2.05309e+02 -> 1.85714e+02 emitting a
> 1.9595e+01 on line 6: internal conversion coefficient = 1e4, Gamma
> intensity = 0.12.
> Dec 2013&#65533;Geant4 10.0 / PhotonEvaporation 3.0 No changes to z90.a231 on
> release notes. Library agrees with above.
> Dec 2014&#65533;Geant4 10.1 / PhotonEvaporation 3.1 No changes to z90.a231 on
> release notes, BUT Gamma intensity for same transition (now line 7) now
> 0.00. IC coeff still 1e4.
> Present&#65533;Geant4 10.2 / PhotonEvaporation 4.3 Gamma intensity still 0. IC
> coeff still 1e4
> As was the case when the problem was first raised, the current version
> of the table does not produce the 57% intensity for the 185.715 keV
> gamma from U235 decay. My question is: was the change going from
> PhotonEvaporation 3.0 to 3.1 intentional, but undocumented, or was it an
> intentional fix?
> Thank you.

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