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On Mon, 15 Sep 2014 14:47:03 GMT, Elaine Mcneice wrote:
> Hello > > The reaction I'm looking at is the 1H(19F,n)19Ne* in a hydrogen gas > cell. After this reaction occurs, the 19Ne should either gamma decay to > ground state or alpha decay to produce 15O. Are there specific physics > processes that should be included, or packages that can be included into > the simulation that will allow for the appropriate secondary nuclei to > be produced and the reaction to occur?
What incident energy are you interested in? I assume a few MeV per nucleon.
I believe there is no way to handle the gamma/alpha competition from a specific excited state short of writing your own process to do that. The models that are used at these energies (notably pre-equilibrium/de-excitation) are intrinsically statistical and cannot account for the details of the level scheme.
Documentation about new processes is still missing for the moment, but you should be able to get a few pointers by looking at the "Geant4 User's Guide for Toolkit Developers", sections 2.5 and 3.5 (maybe 3.3 too).