Import Geant4 0.0.0 source tree

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+// This code implementation is the intellectual property of
+// the RD44 GEANT4 collaboration.
+//
+// By copying, distributing or modifying the Program (or any work
+// based on the Program) you indicate your acceptance of this statement,
+// and all its terms.
+//
+// $Id: G4ReactionKinematics.hh,v 2.1 1998/07/12 03:07:47 urbi Exp $
+// GEANT4 tag $Name: geant4-00 $
+//
+// ------------------------------------------------------------
+//      GEANT 4 class header file --- Copyright CERN 1995
+//      CERN Geneva Switzerland
+//
+//      For information related to this code contact:
+//      CERN, CN Division, ASD group
+//      ------------ G4ReactionDynamics::TwoBody ------
+//                   new inline method BreakupMomentum
+//                   new method TwoBodyScattering
+//                   by Christian V"olcker (CERN-Munich), August 1997
+//                     E-mail: Christian.Volcker@cern.ch
+// ************************************************************
+//-----------------------------------------------------------------------------
+
+#ifndef G4ReactionKinematics_h
+#define G4ReactionKinematics_h 1
+ 
+#include "globals.hh"
+#include "Randomize.hh"
+#include "G4VRestProcess.hh"
+#include "G4ParticleTypes.hh"
+
+class G4ReactionKinematics {
+public:
+   void TwoBodyScattering( const G4DynamicParticle* pIn1, const G4DynamicParticle* pIn2,
+               G4DynamicParticle* pOut1, G4DynamicParticle* pOut2);
+
+   inline G4double BreakupMomentum( G4double totalMass, G4double m1, G4double m2);
+
+};
+
+inline G4double G4ReactionKinematics::BreakupMomentum( 
+          G4double totalMass, G4double massA, G4double massB){
+
+// is aequivalent to  G4double G4PhaseSpaceDecayChannel::Pmx !!
+
+     G4double m0squared=totalMass*totalMass;
+     G4double breakupMomentumSquared=
+         (m0squared-(massA+massB)*(massA+massB))*
+         (m0squared-(massA-massB)*(massA-massB))/
+         (4*m0squared);
+    if (breakupMomentumSquared>0) return sqrt(breakupMomentumSquared);
+    else       return -1.;
+}        
+
+
+#endif