|Message: Re: Alphas cutting off at 1.77 MeV||Not Logged In (login)|
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First of all: this is a question for Geant4 EM physics. You may play with EM parameters for alpha using $G4INSTALL/examples/extended/electromagnetic/TestEm7
In summary: by default these alphas should stop in one step. To force several steps one need to change at least one parameter: cut in range for electrons, step limitation, or stepping function. TestEm7 will help to select optimal conditions.