|Message: Re: Giant Dipole Resonance photo-neutron production in medical linac||Not Logged In (login)|
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Hello, Be careful: if you deactivate any process you will have wrong physics and results will not be reliable. You need to run with high statistics or apply biasing methods. To understand the level of the problem you may use $G4INSTALL/examples/extended/electromagnetic/TestEm0 to study EM cross sections and $G4INSTALL/examples/extended/hadronic/Hadr00 to study gamma-nuclear cross section. The simplest biasing method is to multiply small cross section by a factor, which increase the probability of events of interest but does not change significantly overall tracking. If rare process cross section will be enhanced too much one need apply extra which is out of scope of initial discussion. VI
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