Geant4 Cross Reference |
1 // 1 2 // ******************************************* 3 // * License and Disclaimer 4 // * 5 // * The Geant4 software is copyright of th 6 // * the Geant4 Collaboration. It is provided 7 // * conditions of the Geant4 Software License 8 // * LICENSE and available at http://cern.ch/ 9 // * include a list of copyright holders. 10 // * 11 // * Neither the authors of this software syst 12 // * institutes,nor the agencies providing fin 13 // * work make any representation or warran 14 // * regarding this software system or assum 15 // * use. Please see the license in the file 16 // * for the full disclaimer and the limitatio 17 // * 18 // * This code implementation is the result 19 // * technical work of the GEANT4 collaboratio 20 // * By using, copying, modifying or distri 21 // * any work based on the software) you ag 22 // * use in resulting scientific publicati 23 // * acceptance of all terms of the Geant4 Sof 24 // ******************************************* 25 // 26 // 27 /// \file GB05BOptnSplitAndKillByCrossSection. 28 /// \brief Implementation of the GB05BOptnSpli 29 30 #include "GB05BOptnSplitAndKillByCrossSection. 31 32 #include "Randomize.hh" 33 34 //....oooOO0OOooo........oooOO0OOooo........oo 35 36 GB05BOptnSplitAndKillByCrossSection::GB05BOptn 37 : G4VBiasingOperation(name), fParticleChange 38 {} 39 40 //....oooOO0OOooo........oooOO0OOooo........oo 41 42 GB05BOptnSplitAndKillByCrossSection::~GB05BOpt 43 44 //....oooOO0OOooo........oooOO0OOooo........oo 45 46 G4double GB05BOptnSplitAndKillByCrossSection:: 47 48 { 49 *condition = NotForced; 50 51 // -- Sample the exponential law using the t 52 // -- to couterbalance for: 53 G4double proposedStepLength = -std::log(G4Un 54 55 return proposedStepLength; 56 } 57 58 //....oooOO0OOooo........oooOO0OOooo........oo 59 60 G4VParticleChange* 61 GB05BOptnSplitAndKillByCrossSection::GenerateB 62 { 63 // -- This method is called if we have limit 64 // -- We hence make the splitting or killing 65 66 // Get track weight: 67 G4double initialWeight = track->GetWeight(); 68 69 // The "particle change" is the object to be 70 // the tracking the update of the primary st 71 // secondary tracks. 72 fParticleChange.Initialize(*track); 73 74 // -- Splitting and killing factors. 75 // -- They are taken the same, but the killi 76 G4double splittingFactor = 2.0; 77 G4double killingFactor = 2.0; 78 79 if (track->GetMomentumDirection().z() > 0) { 80 // -- We split if the track is moving forw 81 82 // Define the tracks weight: 83 G4double weightOfTrack = initialWeight / s 84 85 // Ask currect track weight to be changed 86 fParticleChange.ProposeParentWeight(weight 87 // Now make clones of this track (this is 88 // we will then have the primary and clone 89 // splitting by a factor 2: 90 G4Track* clone = new G4Track(*track); 91 clone->SetWeight(weightOfTrack); 92 fParticleChange.AddSecondary(clone); 93 // -- Below's call added for safety & illu 94 // -- modify the clone (ie : daughter) wei 95 // -- primary. Here call not mandatory and 96 fParticleChange.SetSecondaryWeightByProces 97 } 98 else { 99 // -- We apply Russian roulette if the tra 100 101 // Shoot a random number (in ]0,1[ segment 102 G4double random = G4UniformRand(); 103 G4double killingProbability = 1.0 - 1.0 / 104 if (random < killingProbability) { 105 // We ask for the the track to be killed 106 fParticleChange.ProposeTrackStatus(fStop 107 } 108 else { 109 // In this case, the track survives. We 110 // to conserve weight among killed and s 111 fParticleChange.ProposeParentWeight(init 112 } 113 } 114 115 return &fParticleChange; 116 } 117 118 //....oooOO0OOooo........oooOO0OOooo........oo 119