Electron energy spectrum in "rdecay01" example might be incorrect

[Zhang_Xinyu]

Geant4 Version: 11.2.0
Operating System: Windows 11 23H2 & Rocky Linux 9.3
Compiler/Version: Visual Studio 2022 17.8.4 (Windows) & GNU Make 4.3 (Linux)
CMake Version: 3.28.1 (Windows) & 3.20.2 (Linux)

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The maximum electron energy of beta decay of Co-60 with the maximum branch ratio is 160 keV in both Windows and Linux, and the correct energy should be about 317 keV. I’m sorry that as a new user I can’t post more than one picture. I will upload my pictures below.

I’m cautiously guessing that this is an issue with the new version of Geant4 and not my personal problem, as I have produced this issue both on Windows and with G4VM (https://geant4.lp2ib.in2p3.fr/), And I have never seen this problem on older versions.

Could anyone please take the time to try to reproduce this issue?

[Zhang_Xinyu]

This is the electron energy spectrum of Co60 in the “rdecay01” example in Windows:

[Zhang_Xinyu]

This is the electron energy spectrum of Co60 in the “rdecay01” example in Linux:

[maire]

I agree with you.
Please, could you open a bug report ?
Thanks, Michel

[Zhang_Xinyu]

Hello Michel!

I suspect this problem may not exist only with rdecay01, but with G4RadioactiveDecay. I first discovered this problem in an example I wrote myself, and the reason why I use rdecay01 example in this post is just to make it easier for everyone to reproduce.

So please give me some advice on which category I should choose when opening a bug report, Examples/Extended/radioactivedecay/rdecay01 or Geant4/processes/hadronic/models/radioactive_decay?

Thanks!

[maire]

It cannot be rdecay01, which was unchanged …
It is a problem of model/radioactivedecay.

[maire]

I have only Geant4 11.2 installed on my machine.
It would be interesting to compare these 3 histograms, in log scale, between G4 11.1 and 11.2

Cobalt.mac.txt (467 Bytes)

[maire]

In subdirectory rdecay01/references/9.1 we have kept few reference results (from Geant4 9.6).
Here, the decay of Carbon 14

[maire]

the problem is fixed in 11.2 patch 1