This process handles the at-rest annihilation of anti-neutrons.
The model for final state generation is implemented directly in the process
and is derived from the low energy part of GHEISHA. In this model the
anti-neutron may also decay, in which case its handling is returned to the
decay process.
Invocation:
G4AntiNeutronAnnihilationAtRest* anAnnil = new G4AntiNeutronAnnihilationAtRest();
pManager->AddRestProcess(anAnnil);