1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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11 | // * Neither the authors of this software system, nor their employing * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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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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21 | // * any work based on the software) you agree to acknowledge its * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // |
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27 | // $Id: G4VHadronElastic.hh,v 1.4 2009/09/23 14:37:44 vnivanch Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-03 $ |
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29 | // |
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30 | // Geant4 Header : G4VHadronElastic |
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31 | // |
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32 | // Author : V.Ivanchenko 29 June 2009 (redesign old elastic model) |
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33 | // |
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34 | // Modified: |
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35 | // |
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36 | // Class Description |
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37 | // Default model for elastic scattering; GHEISHA algorithm is used |
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38 | // Class Description - End |
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39 | |
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40 | #ifndef G4VHadronElastic_h |
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41 | #define G4VHadronElastic_h 1 |
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42 | |
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43 | #include "globals.hh" |
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44 | #include "G4HadronicInteraction.hh" |
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45 | #include "G4HadProjectile.hh" |
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46 | #include "G4Nucleus.hh" |
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47 | #include "G4NucleiProperties.hh" |
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48 | |
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49 | class G4ParticleDefinition; |
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50 | |
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51 | class G4VHadronElastic : public G4HadronicInteraction |
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52 | { |
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53 | public: |
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54 | |
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55 | G4VHadronElastic(const G4String& name = "hElasticLHEP"); |
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56 | |
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57 | virtual ~G4VHadronElastic(); |
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58 | |
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59 | // implementation of the G4HadronicInteraction interface |
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60 | virtual G4HadFinalState * ApplyYourself(const G4HadProjectile & aTrack, |
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61 | G4Nucleus & targetNucleus); |
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62 | |
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63 | // sample momentum transfer using Lab. momentum |
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64 | virtual G4double SampleInvariantT(const G4ParticleDefinition* p, |
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65 | G4double plab, |
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66 | G4int Z, G4int A); |
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67 | |
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68 | inline void SetLowestEnergyLimit(G4double value); |
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69 | |
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70 | inline void ComputeMomentumCMS(const G4ParticleDefinition* p, |
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71 | G4double plab, G4int Z, G4int A); |
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72 | |
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73 | protected: |
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74 | |
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75 | G4double momentumCMS; |
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76 | |
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77 | private: |
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78 | |
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79 | G4ParticleDefinition* theProton; |
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80 | G4ParticleDefinition* theNeutron; |
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81 | G4ParticleDefinition* theDeuteron; |
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82 | G4ParticleDefinition* theAlpha; |
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83 | |
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84 | G4double lowestEnergyLimit; |
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85 | |
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86 | }; |
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87 | |
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88 | inline void G4VHadronElastic::SetLowestEnergyLimit(G4double value) |
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89 | { |
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90 | lowestEnergyLimit = value; |
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91 | } |
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92 | |
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93 | inline void |
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94 | G4VHadronElastic::ComputeMomentumCMS(const G4ParticleDefinition* p, |
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95 | G4double plab, G4int Z, G4int A) |
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96 | { |
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97 | G4double m1 = p->GetPDGMass(); |
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98 | G4double m12= m1*m1; |
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99 | G4double m2 = G4NucleiProperties::GetNuclearMass(A, Z); |
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100 | momentumCMS = plab*m2/std::sqrt(m12 + m2*m2 + 2.*m2*std::sqrt(m12 + plab*plab)); |
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101 | } |
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102 | |
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103 | #endif |
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