Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/processes/hadronic/models/radioactive_decay/src/G4TritonDecay.cc

Version: [ ReleaseNotes ] [ 1.0 ] [ 1.1 ] [ 2.0 ] [ 3.0 ] [ 3.1 ] [ 3.2 ] [ 4.0 ] [ 4.0.p1 ] [ 4.0.p2 ] [ 4.1 ] [ 4.1.p1 ] [ 5.0 ] [ 5.0.p1 ] [ 5.1 ] [ 5.1.p1 ] [ 5.2 ] [ 5.2.p1 ] [ 5.2.p2 ] [ 6.0 ] [ 6.0.p1 ] [ 6.1 ] [ 6.2 ] [ 6.2.p1 ] [ 6.2.p2 ] [ 7.0 ] [ 7.0.p1 ] [ 7.1 ] [ 7.1.p1 ] [ 8.0 ] [ 8.0.p1 ] [ 8.1 ] [ 8.1.p1 ] [ 8.1.p2 ] [ 8.2 ] [ 8.2.p1 ] [ 8.3 ] [ 8.3.p1 ] [ 8.3.p2 ] [ 9.0 ] [ 9.0.p1 ] [ 9.0.p2 ] [ 9.1 ] [ 9.1.p1 ] [ 9.1.p2 ] [ 9.1.p3 ] [ 9.2 ] [ 9.2.p1 ] [ 9.2.p2 ] [ 9.2.p3 ] [ 9.2.p4 ] [ 9.3 ] [ 9.3.p1 ] [ 9.3.p2 ] [ 9.4 ] [ 9.4.p1 ] [ 9.4.p2 ] [ 9.4.p3 ] [ 9.4.p4 ] [ 9.5 ] [ 9.5.p1 ] [ 9.5.p2 ] [ 9.6 ] [ 9.6.p1 ] [ 9.6.p2 ] [ 9.6.p3 ] [ 9.6.p4 ] [ 10.0 ] [ 10.0.p1 ] [ 10.0.p2 ] [ 10.0.p3 ] [ 10.0.p4 ] [ 10.1 ] [ 10.1.p1 ] [ 10.1.p2 ] [ 10.1.p3 ] [ 10.2 ] [ 10.2.p1 ] [ 10.2.p2 ] [ 10.2.p3 ] [ 10.3 ] [ 10.3.p1 ] [ 10.3.p2 ] [ 10.3.p3 ] [ 10.4 ] [ 10.4.p1 ] [ 10.4.p2 ] [ 10.4.p3 ] [ 10.5 ] [ 10.5.p1 ] [ 10.6 ] [ 10.6.p1 ] [ 10.6.p2 ] [ 10.6.p3 ] [ 10.7 ] [ 10.7.p1 ] [ 10.7.p2 ] [ 10.7.p3 ] [ 10.7.p4 ] [ 11.0 ] [ 11.0.p1 ] [ 11.0.p2 ] [ 11.0.p3, ] [ 11.0.p4 ] [ 11.1 ] [ 11.1.1 ] [ 11.1.2 ] [ 11.1.3 ] [ 11.2 ] [ 11.2.1 ] [ 11.2.2 ] [ 11.3.0 ]

  1 //
  2 // ********************************************************************
  3 // * License and Disclaimer                                           *
  4 // *                                                                  *
  5 // * The  Geant4 software  is  copyright of the Copyright Holders  of *
  6 // * the Geant4 Collaboration.  It is provided  under  the terms  and *
  7 // * conditions of the Geant4 Software License,  included in the file *
  8 // * LICENSE and available at  http://cern.ch/geant4/license .  These *
  9 // * include a list of copyright holders.                             *
 10 // *                                                                  *
 11 // * Neither the authors of this software system, nor their employing *
 12 // * institutes,nor the agencies providing financial support for this *
 13 // * work  make  any representation or  warranty, express or implied, *
 14 // * regarding  this  software system or assume any liability for its *
 15 // * use.  Please see the license in the file  LICENSE  and URL above *
 16 // * for the full disclaimer and the limitation of liability.         *
 17 // *                                                                  *
 18 // * This  code  implementation is the result of  the  scientific and *
 19 // * technical work of the GEANT4 collaboration.                      *
 20 // * By using,  copying,  modifying or  distributing the software (or *
 21 // * any work based  on the software)  you  agree  to acknowledge its *
 22 // * use  in  resulting  scientific  publications,  and indicate your *
 23 // * acceptance of all terms of the Geant4 Software license.          *
 24 // ********************************************************************
 25 //
 26 ////////////////////////////////////////////////////////////////////////////////
 27 //                                                                            //
 28 //  File:   G4TritonDecay.cc  based on G4AlphaDecay                                                //
 29 //  Author: A.Mereagglia (CENBG), imported in G4repository  by L.Desorgher                                                //
 30 //  Date:   24 June 2019, imported in Geant4 on 31 October 2019                                                  //
 31 //  Description:          //
 32 //                  //
 33 //                                                                            //
 34 ////////////////////////////////////////////////////////////////////////////////
 35 
 36 #include "G4TritonDecay.hh"
 37 #include "G4IonTable.hh"
 38 #include "Randomize.hh"
 39 #include "G4ThreeVector.hh"
 40 #include "G4DynamicParticle.hh"
 41 #include "G4DecayProducts.hh"
 42 #include "G4PhysicalConstants.hh"
 43 #include "G4SystemOfUnits.hh"
 44 #include <iostream>
 45 #include <iomanip>
 46 
 47 G4TritonDecay::G4TritonDecay(const G4ParticleDefinition* theParentNucleus,
 48                            const G4double& branch, const G4double& Qvalue,
 49                            const G4double& excitationE,
 50                            const G4Ions::G4FloatLevelBase& flb)
 51  : G4NuclearDecay("triton decay", Triton, excitationE, flb), transitionQ(Qvalue)
 52 {
 53   SetParent(theParentNucleus);  // Store name of parent nucleus, delete G4MT_parent 
 54   SetBR(branch);
 55 
 56   SetNumberOfDaughters(2);
 57   G4IonTable* theIonTable =
 58     (G4IonTable*)(G4ParticleTable::GetParticleTable()->GetIonTable());
 59   G4int daughterZ = theParentNucleus->GetAtomicNumber() - 1;
 60   G4int daughterA = theParentNucleus->GetAtomicMass() - 3;
 61   SetDaughter(0, theIonTable->GetIon(daughterZ, daughterA, excitationE, flb) );
 62   SetDaughter(1, "triton");
 63 }
 64 
 65 
 66 G4TritonDecay::~G4TritonDecay()
 67 {}
 68 
 69 
 70 G4DecayProducts* G4TritonDecay::DecayIt(G4double)
 71 {
 72   // Fill G4MT_parent with theParentNucleus (stored by SetParent in ctor)  
 73   CheckAndFillParent();
 74 
 75   // Fill G4MT_daughters with triton and residual nucleus (stored by SetDaughter)
 76   CheckAndFillDaughters();
 77 
 78   G4double tritonMass = G4MT_daughters[1]->GetPDGMass();
 79   // Excitation energy included in PDG mass
 80   G4double nucleusMass = G4MT_daughters[0]->GetPDGMass();
 81 
 82   // Q value was calculated from atomic masses.
 83   // Use it to get correct triton energy.
 84   G4double cmMomentum = std::sqrt(transitionQ*(transitionQ + 2.*tritonMass)*
 85                                 (transitionQ + 2.*nucleusMass)*
 86                                 (transitionQ + 2.*tritonMass + 2.*nucleusMass) )/
 87                                 (transitionQ + tritonMass + nucleusMass)/2.;
 88 
 89   // Set up final state
 90   // parentParticle is set at rest here because boost with correct momentum 
 91   // is done later
 92   G4DynamicParticle parentParticle(G4MT_parent, G4ThreeVector(0,0,0), 0.0);
 93   G4DecayProducts* products = new G4DecayProducts(parentParticle);
 94 
 95   G4double costheta = 2.*G4UniformRand()-1.0;
 96   G4double sintheta = std::sqrt(1.0 - costheta*costheta);
 97   G4double phi  = twopi*G4UniformRand()*rad;
 98   G4ThreeVector direction(sintheta*std::cos(phi),sintheta*std::sin(phi),
 99                           costheta);
100 
101   G4double KE = std::sqrt(cmMomentum*cmMomentum + tritonMass*tritonMass)
102               - tritonMass;
103   G4DynamicParticle* daughterparticle =
104     new G4DynamicParticle(G4MT_daughters[1], direction, KE, tritonMass);
105   products->PushProducts(daughterparticle);
106 
107   KE = std::sqrt(cmMomentum*cmMomentum + nucleusMass*nucleusMass) - nucleusMass;
108   daughterparticle =
109     new G4DynamicParticle(G4MT_daughters[0], -1.0*direction, KE, nucleusMass);
110   products->PushProducts(daughterparticle);
111 
112   // Energy conservation check
113   // For triton decays, do final energy check against reaction Q value
114   // which is well-measured using atomic mass differences.  Nuclear masses
115   // should not be used since they are not usually directly measured and we
116   // always decay atoms and not fully stripped nuclei.
117   /*
118   G4int nProd = products->entries();
119   G4DynamicParticle* temp = 0;
120   G4double Esum = 0.0;
121   for (G4int i = 0; i < nProd; i++) {
122     temp = products->operator[](i);
123     Esum += temp->GetKineticEnergy();
124   }
125   G4double eCons = (transitionQ - Esum)/keV;
126   if (eCons > 1.e-07) G4cout << " Triton decay check: Ediff (keV) = " << eCons << G4endl;
127   */
128   return products;
129 }
130 
131 
132 void G4TritonDecay::DumpNuclearInfo()
133 {
134   G4cout << " G4TritonDecay for parent nucleus " << GetParentName() << G4endl;
135   G4cout << " decays to " << GetDaughterName(0) << " + " << GetDaughterName(1)
136          << " with branching ratio " << GetBR() << "% and Q value "
137          << transitionQ << G4endl;
138 }
139 
140