|Message: Re: Proton beam impacting Lithium||Not Logged In (login)|
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Although 2.5 MeV is quite low in energy, you might try a physics list such as QGSP_BIC, which uses the Geant4 precompound model. No guarantees though about its physics quality at that energy.
More appropriate might be the new ParticleHP model which works for lower energies. When Geant4 10.2 is released in December, the HP physics lists will have this already included.