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Question Apparent undocumented change to Th231 (z90.a231) in PhotonEvaporation 

Forum: Hadronic Processes
Date: 12 Dec, 2016
From: Guangyong Koh <Guangyong Koh>

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—Issue first raised here ( http://hypernews.slac.stanford.edu/HyperNews/geant4/get/hadronprocess/441.html ).

Nov 2012—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—Geant4 10.0 / PhotonEvaporation 3.0 No changes to z90.a231 on release notes. Library agrees with above.

Dec 2014—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—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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1 None: Re: Apparent undocumented change to Th231 (z90.a231) in PhotonEvaporation   (Guangyong Koh - 12 Dec, 2016)
2 None: Re: Apparent undocumented change to Th231 (z90.a231) in PhotonEvaporation   (Dennis H. Wright - 17 Dec, 2016)
3 None: Re: Apparent undocumented change to Th231 (z90.a231) in PhotonEvaporation   (Laurent Desorgher - 18 Dec, 2016)
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