Gabriele Cosmo
72 lines
3.0 KiB
C++
72 lines
3.0 KiB
C++
//
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// ********************************************************************
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// * DISCLAIMER *
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// * *
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// * The following disclaimer summarizes all the specific disclaimers *
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// * of contributors to this software. The specific disclaimers,which *
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// * govern, are listed with their locations in: *
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// * http://cern.ch/geant4/license *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. *
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// * *
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// * This code implementation is the intellectual property of the *
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// * GEANT4 collaboration. *
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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 *
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// * statement, and all its terms. *
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// ********************************************************************
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//
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//
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// $Id: G4ReactionKinematics.hh,v 1.5 2002/12/12 19:18:39 gunter Exp $
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// GEANT4 tag $Name: geant4-05-00 $
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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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// ------------ 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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