Gabriele Cosmo
73 lines
3.2 KiB
C++
73 lines
3.2 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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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. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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//
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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 std::sqrt(breakupMomentumSquared);
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else return -1.;
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}
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#endif
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