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Your attached code showed that you are using a G4ParticleGun to create the source ... in order to use the G4GeneralParticleSource )G4GPS) methods, you must first instantiate a concrete object of this type in your derived G4VUserPrimaryGeneratorAction class. I have attached "PGA.hh" and "PGA.cc" that shows a very simple implementation of the G4GPS source. If you replace your derived G4VUserPrimaryGeneratorAction class with this one, you will have access to the G4GPS commands from the runtime command line (they are listed under the /gps/ directory).
In addition, I have attached a G4GPS macro "AmBeNeutronVertex.gps" that creates the correct 241Am-Be neutron spectrum via spline interpolation on a series of data points taken from a literature reference. You should execute this macro from the command line via "/control/execute AmBeNeutronVertex.gps" (after obviously changing whatever parameters you might need for your application).
Hope this helps.
Attachment: http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2015/01/18/11.50-4207-PGA.hh http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2015/01/18/11.50-89219-PGA.cc http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2015/01/18/11.50-54319-AmBeNeutronVertex.gps