| 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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| 17 | // * * |
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| 18 | // * This code implementation is the result of the scientific and * |
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| 19 | // * technical work of the GEANT4 collaboration. * |
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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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| 23 | // * acceptance of all terms of the Geant4 Software license. * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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| 26 | // |
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| 27 | // |
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| 28 | // ------------------------------------------------------------ |
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| 29 | // GEANT 4 class header file --- Copyright CERN 1995 |
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| 30 | // CERN Geneva Switzerland |
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| 31 | // |
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| 32 | // ------------ G4ReactionDynamics::TwoBody ------ |
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| 33 | // new inline method BreakupMomentum |
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| 34 | // new method TwoBodyScattering |
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| 35 | // by Christian V"olcker (CERN-Munich), August 1997 |
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| 36 | // E-mail: Christian.Volcker@cern.ch |
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| 37 | // ************************************************************ |
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| 38 | //----------------------------------------------------------------------------- |
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| 39 | |
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| 40 | #ifndef G4ReactionKinematics_h |
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| 41 | #define G4ReactionKinematics_h 1 |
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| 42 | |
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| 43 | #include "globals.hh" |
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| 44 | #include "Randomize.hh" |
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| 45 | #include "G4VRestProcess.hh" |
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| 46 | #include "G4ParticleTypes.hh" |
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| 47 | |
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| 48 | class G4ReactionKinematics { |
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| 49 | public: |
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| 50 | void TwoBodyScattering( const G4DynamicParticle* pIn1, const G4DynamicParticle* pIn2, |
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| 51 | G4DynamicParticle* pOut1, G4DynamicParticle* pOut2); |
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| 52 | |
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| 53 | inline G4double BreakupMomentum( G4double totalMass, G4double m1, G4double m2); |
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| 54 | |
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| 55 | }; |
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| 56 | |
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| 57 | inline G4double G4ReactionKinematics::BreakupMomentum( |
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| 58 | G4double totalMass, G4double massA, G4double massB){ |
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| 59 | |
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| 60 | // is aequivalent to G4double G4PhaseSpaceDecayChannel::Pmx !! |
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| 61 | |
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| 62 | G4double m0squared=totalMass*totalMass; |
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| 63 | G4double breakupMomentumSquared= |
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| 64 | (m0squared-(massA+massB)*(massA+massB))* |
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| 65 | (m0squared-(massA-massB)*(massA-massB))/ |
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| 66 | (4*m0squared); |
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| 67 | if (breakupMomentumSquared>0) return std::sqrt(breakupMomentumSquared); |
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| 68 | else return -1.; |
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| 69 | } |
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| 70 | |
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| 71 | |
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| 72 | #endif |
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