Coalescence Model for Cosmic-Ray applications

A new coalescence model, G4CRCoalescence, has been introduced. By considering the list of secondaries produced by a string model, the model forms deuterons and antideuterons from, respectively, proton-neutron and antiproton-antineutron pairs with close momenta. This can be useful in particular for Cosmic-Ray applications. By default, the coalescence model is disabled. It can be switched on via either a C++ call to the method:

G4HadronicParameters::Instance()->SetEnableCRCoalescence( true )

or the new UI command:

/process/had/enableCRCoalescence true

when using any reference physics list, as well as any custom physics list that uses one of the string models, FTF or QGS.