00001 // 00002 // ******************************************************************** 00003 // * License and Disclaimer * 00004 // * * 00005 // * The Geant4 software is copyright of the Copyright Holders of * 00006 // * the Geant4 Collaboration. It is provided under the terms and * 00007 // * conditions of the Geant4 Software License, included in the file * 00008 // * LICENSE and available at http://cern.ch/geant4/license . These * 00009 // * include a list of copyright holders. * 00010 // * * 00011 // * Neither the authors of this software system, nor their employing * 00012 // * institutes,nor the agencies providing financial support for this * 00013 // * work make any representation or warranty, express or implied, * 00014 // * regarding this software system or assume any liability for its * 00015 // * use. Please see the license in the file LICENSE and URL above * 00016 // * for the full disclaimer and the limitation of liability. * 00017 // * * 00018 // * This code implementation is the result of the scientific and * 00019 // * technical work of the GEANT4 collaboration. * 00020 // * By using, copying, modifying or distributing the software (or * 00021 // * any work based on the software) you agree to acknowledge its * 00022 // * use in resulting scientific publications, and indicate your * 00023 // * acceptance of all terms of the Geant4 Software license. * 00024 // ******************************************************************** 00025 // 00026 // 00027 // 00028 // ------------------------------------------------------------ 00029 // GEANT 4 class header file --- Copyright CERN 1995 00030 // CERN Geneva Switzerland 00031 // 00032 // ------------ G4ReactionDynamics::TwoBody ------ 00033 // new inline method BreakupMomentum 00034 // new method TwoBodyScattering 00035 // by Christian V"olcker (CERN-Munich), August 1997 00036 // E-mail: Christian.Volcker@cern.ch 00037 // ************************************************************ 00038 //----------------------------------------------------------------------------- 00039 00040 #ifndef G4ReactionKinematics_h 00041 #define G4ReactionKinematics_h 1 00042 00043 #include "globals.hh" 00044 #include "Randomize.hh" 00045 #include "G4VRestProcess.hh" 00046 #include "G4ParticleTypes.hh" 00047 00048 class G4ReactionKinematics { 00049 public: 00050 void TwoBodyScattering( const G4DynamicParticle* pIn1, const G4DynamicParticle* pIn2, 00051 G4DynamicParticle* pOut1, G4DynamicParticle* pOut2); 00052 00053 inline G4double BreakupMomentum( G4double totalMass, G4double m1, G4double m2); 00054 00055 }; 00056 00057 inline G4double G4ReactionKinematics::BreakupMomentum( 00058 G4double totalMass, G4double massA, G4double massB){ 00059 00060 // is aequivalent to G4double G4PhaseSpaceDecayChannel::Pmx !! 00061 00062 G4double m0squared=totalMass*totalMass; 00063 G4double breakupMomentumSquared= 00064 (m0squared-(massA+massB)*(massA+massB))* 00065 (m0squared-(massA-massB)*(massA-massB))/ 00066 (4*m0squared); 00067 if (breakupMomentumSquared>0) return std::sqrt(breakupMomentumSquared); 00068 else return -1.; 00069 } 00070 00071 00072 #endif