1 | // |
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2 | // ******************************************************************** |
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3 | // * DISCLAIMER * |
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4 | // * * |
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5 | // * The following disclaimer summarizes all the specific disclaimers * |
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6 | // * of contributors to this software. The specific disclaimers,which * |
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7 | // * govern, are listed with their locations in: * |
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8 | // * http://cern.ch/geant4/license * |
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9 | // * * |
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10 | // * Neither the authors of this software system, nor their employing * |
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11 | // * institutes,nor the agencies providing financial support for this * |
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12 | // * work make any representation or warranty, express or implied, * |
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13 | // * regarding this software system or assume any liability for its * |
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14 | // * use. * |
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15 | // * * |
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16 | // * This code implementation is the intellectual property of the * |
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17 | // * GEANT4 collaboration. * |
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18 | // * By copying, distributing or modifying the Program (or any work * |
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19 | // * based on the Program) you indicate your acceptance of this * |
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20 | // * statement, and all its terms. * |
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21 | // ******************************************************************** |
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22 | // |
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23 | #include "globals.hh" |
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24 | #include "G4Absorber.hh" |
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25 | #include "G4Fancy3DNucleus.hh" |
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26 | #include "G4KineticTrackVectorSTL.hh" |
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27 | #include "G4ThreeVector.hh" |
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28 | #include "G4LorentzVector.hh" |
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29 | #include "Randomize.hh" |
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30 | #include "G4PionPlus.hh" |
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31 | #include "G4LeptonConstructor.hh" |
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32 | |
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33 | |
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34 | G4V3DNucleus * the3DNucleus; |
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35 | G4KineticTrackVectorSTL theTargetList; |
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36 | |
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37 | void BuildTargetList(); |
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38 | G4ThreeVector GetSpherePoint(G4double r); |
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39 | |
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40 | int main(int argc, char ** argv) |
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41 | { |
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42 | G4LeptonConstructor leptons; |
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43 | leptons.ConstructParticle(); |
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44 | |
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45 | G4int A, Z; |
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46 | G4int nEvents; |
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47 | if(argc != 4) |
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48 | { |
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49 | cout << "Input A and Z: "; |
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50 | cin >> A >> Z; |
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51 | cout << "Input number of events: "; |
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52 | cin >> nEvents; |
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53 | } |
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54 | else |
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55 | { |
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56 | A = atoi(argv[1]); |
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57 | Z = atoi(argv[2]); |
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58 | nEvents = atoi(argv[3]); |
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59 | } |
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60 | |
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61 | // create the nucleus |
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62 | the3DNucleus = new G4Fancy3DNucleus; |
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63 | the3DNucleus->Init(A, Z); |
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64 | // create theTargetList |
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65 | BuildTargetList(); |
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66 | // create the pion |
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67 | G4ParticleDefinition * pion = G4PionPlus::PionPlus(); |
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68 | G4ThreeVector pos = GetSpherePoint(the3DNucleus->GetOuterRadius()); |
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69 | G4double p = 100*MeV; |
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70 | G4double mass = pion->GetPDGMass(); |
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71 | G4LorentzVector mom(0, 0, p, sqrt(p*p+mass*mass)); |
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72 | G4KineticTrack kt(pion, 0., pos, mom); |
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73 | // create the absorber |
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74 | G4double theCutOnP = 150*MeV; |
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75 | G4Absorber absorber(theCutOnP); |
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76 | |
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77 | absorber.FindAbsorbers(kt, theTargetList); |
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78 | for(G4int i = 0; i < nEvents; ++i) |
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79 | { |
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80 | absorber.FindProducts(kt); |
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81 | } |
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82 | |
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83 | return 0; |
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84 | } |
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85 | |
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86 | |
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87 | void BuildTargetList() |
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88 | { |
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89 | if(!the3DNucleus->StartLoop()) |
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90 | { |
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91 | G4cerr << "G4HadronKineticModel::BuildTargetList(): StartLoop() error!" |
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92 | << G4endl; |
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93 | return; |
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94 | } |
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95 | G4Nucleon * nucleon; |
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96 | G4ParticleDefinition * definition; |
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97 | G4ThreeVector pos; |
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98 | G4LorentzVector mom; |
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99 | while((nucleon = the3DNucleus->GetNextNucleon()) != NULL) |
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100 | { |
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101 | definition = nucleon->GetDefinition(); |
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102 | pos = nucleon->GetPosition(); |
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103 | mom = nucleon->GetMomentum(); |
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104 | G4KineticTrack * kt = new G4KineticTrack(definition, 0., pos, mom); |
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105 | theTargetList.push_back(kt); |
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106 | } |
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107 | } |
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108 | |
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109 | |
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110 | G4ThreeVector GetSpherePoint(G4double r) |
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111 | { |
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112 | // Get the entry point of the projectile, distribuited uniformly |
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113 | // on the projection of the surface in the plane ortogonal to the direction |
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114 | // of the motion. |
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115 | G4double b = r*G4UniformRand(); // impact parameter |
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116 | G4double phi = G4UniformRand()*2*pi; |
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117 | G4double x = b*cos(phi); |
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118 | G4double y = b*sin(phi); |
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119 | G4double z = -sqrt(r*r-b*b); |
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120 | z *= 1.001; // Get position a little bit out of the sphere... |
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121 | G4ThreeVector point; |
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122 | point.setX(x); |
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123 | point.setY(y); |
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124 | point.setZ(z); |
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125 | return point; |
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126 | } |
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