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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