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Forum: Hadronic Processes
Re: Question Modifying RadioactiveDecay Half-life (Nicole Ackerman)
Date: 02 Mar, 2017
From: Nicole Ackerman <Nicole Ackerman>

I'm trying to change the Ac225 half-life through the method of using /grdm/setRadioactiveDecayFile but I was not successful. I wrote a corrected file, but I still received the same message (Ac225 is not a valid nucleus for the RDM).

I'm now trying to use example rdecay01 to understand what might be the problem. When I run the example code, with no modifications, it works fine. However, if I changed the UserRadData_z98.a238 file at all the code no longer functions. I recein an error that the "Selected decay mode does not exist".

After some investigating, I found that the problem was that my texteditor was adding a newline at the end of the file - which apparently breaks the ability for Geant4 to parse these files. I'm leaving this message here since I didn't see the need to NOT have a terminal linebreak mentioned anywhere in the documentation. Others might have the same problem.

However, I still am unable to get Ac225 to decay. I've tried generating decays of Ac225 in the rdecay01 example, and the nucleus does not decay. I've taken the file for 238Cf in the rdecay01 example and specified it as z=89,a=225 - but still Ac225 does not decay. I can successfully change the Cf238 decay, so I am sure everything else is set up correctly.

At this point, I think there is information somewhere else in Geant4 (Beyond the a89.z225 files) that indicate Ac225 is stable and cannot decay. However, I do not know where that is. I know this is fixed in the new version of Geant4, but I need to maintain the version of Geant4 that has been used for previous work.

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