What's the physical meaning of the fMaxLifeTime in G4DeexPrecoParameters.hh

I am reading the example “Ddecay01” to learn how to set a Radioactive Decay List. I found that the fMaxLifeTime is set as 0.1 ps. Why and what’s the physical meaning to do so? I noticed that in a G4RadioactiveDecayPhysics constructor it is set to be halfLifetime / ln2. Which one should I use when I am interested the radioactive isotope activition after a proton beam bombarded the target.

Thanks very much for any help!

_Geant4 Version:_11.1.3
_Operating System:_UBUNTU20.04
_Compiler/Version:_GCC11
_CMake Version:_cmake-3.27.9


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