Work around G4 10.6.patch03 bug where Anti-neutrons are considered stable (ATLASSIM-6634) (!64277) · Merge requests · atlas / athena

John Derek Chapman requested to merge jchapman/athena:UnstableAntiNeutrons_ATLASSIM-6634_23.0 into 23.0 Jul 11, 2023

Some jobs running Fatras + Geant4 got caught by a bug in Geant4 10.6, where anti-neutrons were considered to be stable. This leads to the issues described in ATLASSIM-6634. This is fixed in Geant4 11 onwards, but ATLAS will most likely not switch to that for a while. For now, fixing the bug at runtime for jobs running Fatras + Geant4, in the future the bug could be fixed for all simulation configurations. Due to the rarity of the process, then this should have minimal impact on physics distributions.

Tagging @mbandier, @tlari, @fatsai, @lmijovic, @pagacova, @sjiggins.

Work around G4 10.6.patch03 bug where Anti-neutrons are considered stable (ATLASSIM-6634)

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