00001 // 00002 // ******************************************************************** 00003 // * License and Disclaimer * 00004 // * * 00005 // * The Geant4 software is copyright of the Copyright Holders of * 00006 // * the Geant4 Collaboration. It is provided under the terms and * 00007 // * conditions of the Geant4 Software License, included in the file * 00008 // * LICENSE and available at http://cern.ch/geant4/license . These * 00009 // * include a list of copyright holders. * 00010 // * * 00011 // * Neither the authors of this software system, nor their employing * 00012 // * institutes,nor the agencies providing financial support for this * 00013 // * work make any representation or warranty, express or implied, * 00014 // * regarding this software system or assume any liability for its * 00015 // * use. Please see the license in the file LICENSE and URL above * 00016 // * for the full disclaimer and the limitation of liability. * 00017 // * * 00018 // * This code implementation is the result of the scientific and * 00019 // * technical work of the GEANT4 collaboration. * 00020 // * By using, copying, modifying or distributing the software (or * 00021 // * any work based on the software) you agree to acknowledge its * 00022 // * use in resulting scientific publications, and indicate your * 00023 // * acceptance of all terms of the Geant4 Software license. * 00024 // ******************************************************************** 00025 // 00026 // G4AntiNeutronAnnihilationAtRest physics process 00027 // Larry Felawka (TRIUMF), April 1998 00028 //--------------------------------------------------------------------- 00029 00030 #ifndef G4AntiNeutronAnnihilationAtRest_h 00031 #define G4AntiNeutronAnnihilationAtRest_h 1 00032 00033 // Class Description: 00034 // 00035 // Process for absorption of n-bar at rest. 00036 // To be used in your physics list in case you need this physics. 00037 00038 #include "globals.hh" 00039 #include "Randomize.hh" 00040 #include "G4VRestProcess.hh" 00041 #include "G4VParticleChange.hh" 00042 #include "G4ParticleDefinition.hh" 00043 #include "G4GHEKinematicsVector.hh" 00044 #include "G4HadronicProcessType.hh" 00045 00046 class G4AntiNeutronAnnihilationAtRest : public G4VRestProcess 00047 00048 { 00049 private: 00050 // hide assignment operator as private 00051 G4AntiNeutronAnnihilationAtRest& operator=(const G4AntiNeutronAnnihilationAtRest &right); 00052 G4AntiNeutronAnnihilationAtRest(const G4AntiNeutronAnnihilationAtRest& ); 00053 00054 public: 00055 00056 G4AntiNeutronAnnihilationAtRest(const G4String& processName ="AntiNeutronAnnihilationAtRest", 00057 G4ProcessType aType = fHadronic ); 00058 00059 ~G4AntiNeutronAnnihilationAtRest(); 00060 00061 G4bool IsApplicable(const G4ParticleDefinition&); 00062 00063 void PreparePhysicsTable(const G4ParticleDefinition&); 00064 00065 void BuildPhysicsTable(const G4ParticleDefinition&); 00066 00067 G4double AtRestGetPhysicalInteractionLength(const G4Track&, 00068 G4ForceCondition*); 00069 00070 // zero mean lifetime 00071 G4double GetMeanLifeTime(const G4Track& , 00072 G4ForceCondition* ) {return 0.0;} 00073 00074 G4VParticleChange* AtRestDoIt(const G4Track&, const G4Step&); 00075 00076 // return number of secondaries produced 00077 G4int GetNumberOfSecondaries(); 00078 00079 // pointer to array containg kinematics of secondaries 00080 G4GHEKinematicsVector* GetSecondaryKinematics(); 00081 00082 private: 00083 00084 void GenerateSecondaries(); 00085 void Poisso( G4float, G4int* ); 00086 void Normal( G4float* ); 00087 void AntiNeutronAnnihilation( G4int* ); 00088 G4double ExNu( G4float ); 00089 G4int NFac( G4int ); 00090 00091 private: 00092 00093 // global time-of-flight of stopped AntiNeutron 00094 G4float globalTime; 00095 00096 // atomic mass of target nucleus 00097 G4float targetAtomicMass; 00098 00099 // charge of target nucleus 00100 G4float targetCharge; 00101 00102 G4GHEKinematicsVector* pv; 00103 G4GHEKinematicsVector* eve; 00104 G4GHEKinematicsVector* gkin; 00105 00106 G4float evapEnergy1; 00107 G4float evapEnergy3; 00108 00109 G4int ngkine; 00110 00111 G4int ntot; 00112 G4GHEKinematicsVector result; 00113 00114 G4float massPionMinus; 00115 G4float massPionZero; 00116 G4float massPionPlus; 00117 G4float massGamma; 00118 G4float massAntiNeutron; 00119 G4float massNeutron; 00120 00121 G4ParticleDefinition* pdefGamma; 00122 G4ParticleDefinition* pdefPionPlus; 00123 G4ParticleDefinition* pdefPionZero; 00124 G4ParticleDefinition* pdefPionMinus; 00125 G4ParticleDefinition* pdefProton; 00126 G4ParticleDefinition* pdefNeutron; 00127 G4ParticleDefinition* pdefAntiNeutron; 00128 G4ParticleDefinition* pdefDeuteron; 00129 G4ParticleDefinition* pdefTriton; 00130 G4ParticleDefinition* pdefAlpha; 00131 00132 }; 00133 00134 #endif 00135