[1199] | 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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