|Message: Re: Getting Neutron Scattering in Liquid Scintillator||Not Logged In (login)|
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> There is no interaction at all. Is there a specific physics list I'm missing?
There are two steps. First, the neutrons have to interact with the result of an energetic secondary charged particle. Do you see this happen (with tracking verbose, or if that produces too much output, with some logic in your SteppingAction that'll print the occurrence). If you never see the neutron interact or a charge particle being produced then you'll need to understand why that is the case for your neutrons, material, production-cut and physics-list. If you still can't make sense of it then, by all means, post a question to the hadronic physics forum. If you see a charge particle then perhaps its energy is so low that the yield you specified just doesn't produce any optical photons.
Could it be that you set a rather high production cut? (please, read up on 'production cuts' in the Application Developers Manual).