Gabriele Cosmo
68 lines
2.1 KiB
C++
68 lines
2.1 KiB
C++
// This code implementation is the intellectual property of
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// the GEANT4 collaboration.
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//
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// By copying, distributing or modifying the Program (or any work
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// based on the Program) you indicate your acceptance of this statement,
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// and all its terms.
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//
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// $Id: G4PhaseSpaceDecayChannel.hh,v 1.2.4.1 1999/12/07 20:49:52 gunter Exp $
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// GEANT4 tag $Name: geant4-01-00 $
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//
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//
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// ------------------------------------------------------------
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// GEANT 4 class header file
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//
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// For information related to this code contact:
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// CERN, CN Division, ASD group
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// History: first implementation, based on object model of
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// 27 July 1996 H.Kurashige
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// 30 May 1997 H.Kurashige
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// ------------------------------------------------------------
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#ifndef G4PhaseSpaceDecayChannel_h
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#define G4PhaseSpaceDecayChannel_h 1
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#include "G4ios.hh"
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#include "globals.hh"
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#include "G4VDecayChannel.hh"
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class G4PhaseSpaceDecayChannel :public G4VDecayChannel
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{
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public: // With Description
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//Constructors
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G4PhaseSpaceDecayChannel(G4int Verbose = 1);
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G4PhaseSpaceDecayChannel(const G4String& theParentName,
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G4double theBR,
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G4int theNumberOfDaughters,
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const G4String& theDaughterName1,
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const G4String& theDaughterName2 = "",
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const G4String& theDaughterName3 = "",
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const G4String& theDaughterName4 = "" );
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public:
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// Destructor
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virtual ~G4PhaseSpaceDecayChannel();
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public: // With Description
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virtual G4DecayProducts *DecayIt(G4double);
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public:
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static G4double Pmx(G4double e, G4double p1, G4double p2);
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private:
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G4DecayProducts *OneBodyDecayIt();
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G4DecayProducts *TwoBodyDecayIt();
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G4DecayProducts *ThreeBodyDecayIt();
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G4DecayProducts *ManyBodyDecayIt();
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};
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inline
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G4double G4PhaseSpaceDecayChannel::Pmx(G4double e, G4double p1, G4double p2)
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{
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// calcurate momentum of daughter particles in two-body decay
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G4double ppp = (e+p1+p2)*(e+p1-p2)*(e-p1+p2)*(e-p1-p2)/(4.0*e*e);
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if (ppp>0) return sqrt(ppp);
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else return -1.;
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}
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#endif
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