Gabriele Cosmo
58 lines
2.0 KiB
C++
58 lines
2.0 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: G4ReactionKinematics.hh,v 1.2 1999/12/15 14:53:40 gunter Exp $
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// GEANT4 tag $Name: geant4-03-00 $
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//
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// ------------------------------------------------------------
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// GEANT 4 class header file --- Copyright CERN 1995
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// CERN Geneva Switzerland
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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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// ------------ G4ReactionDynamics::TwoBody ------
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// new inline method BreakupMomentum
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// new method TwoBodyScattering
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// by Christian V"olcker (CERN-Munich), August 1997
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// E-mail: Christian.Volcker@cern.ch
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// ************************************************************
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//-----------------------------------------------------------------------------
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#ifndef G4ReactionKinematics_h
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#define G4ReactionKinematics_h 1
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#include "globals.hh"
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#include "Randomize.hh"
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#include "G4VRestProcess.hh"
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#include "G4ParticleTypes.hh"
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class G4ReactionKinematics {
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public:
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void TwoBodyScattering( const G4DynamicParticle* pIn1, const G4DynamicParticle* pIn2,
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G4DynamicParticle* pOut1, G4DynamicParticle* pOut2);
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inline G4double BreakupMomentum( G4double totalMass, G4double m1, G4double m2);
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};
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inline G4double G4ReactionKinematics::BreakupMomentum(
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G4double totalMass, G4double massA, G4double massB){
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// is aequivalent to G4double G4PhaseSpaceDecayChannel::Pmx !!
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G4double m0squared=totalMass*totalMass;
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G4double breakupMomentumSquared=
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(m0squared-(massA+massB)*(massA+massB))*
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(m0squared-(massA-massB)*(massA-massB))/
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(4*m0squared);
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if (breakupMomentumSquared>0) return sqrt(breakupMomentumSquared);
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else return -1.;
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}
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#endif
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