[819] | 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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| 17 | // * * |
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| 18 | // * This code implementation is the result of the scientific and * |
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| 19 | // * technical work of the GEANT4 collaboration. * |
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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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| 23 | // * acceptance of all terms of the Geant4 Software license. * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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| 26 | // $Id: G4QCaptureAtRest.hh,v 1.3 2007/02/09 09:33:28 mkossov Exp $ |
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| 27 | // GEANT4 tag $Name: $ |
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| 28 | // |
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| 29 | // ---------------- G4QCaptureAtRest header ---------------- |
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| 30 | // by Mikhail Kossov, December 2003. |
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| 31 | // Header of G4QCaptureAtRest class (mu-,pi-,K-) of the CHIPS Simulation Branch in GEANT4 |
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| 32 | // ------------------------------------------------------------------------------- |
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| 33 | // This is a unique CHIPS class for the Nuclear Capture At Rest Prosesses. |
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| 34 | // ------------------------------------------------------------------------------- |
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| 35 | // At present (Dec.03) only pi-, K- and antiNucleon capture is implemented, which |
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| 36 | // are the most crucial for the in matter simulation. The hyperon capture (Sigma-, |
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| 37 | // Xi-, Omega-, antiSigma+) is implemented, but not tested and it is not clear how |
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| 38 | // frequently this kind of interaction takes place in the simulation of the hadronic |
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| 39 | // showers. The antiNeutron Capture At Rest is implemented by this G4QCaptureAtRest |
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| 40 | // class, but it is not clear how the anti-neutrons are stopped in Geant4 tracking. |
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| 41 | // It can be stopped only by interactions with electrons, as the annihilation |
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| 42 | // cross section is huge and any interaction with nucleus results in annihilation. |
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| 43 | // --> The mu-&tau- Capture At Rest (mu-,nu)&(mu-,nu) are weak processes, which must |
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| 44 | // be simulated together with the reversed Betha decay (e-,nu). While mu- capture is |
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| 45 | // similar to the pi- capture from the nuclear fragmentation point of view (the energy |
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| 46 | // scale is shrinked mecause m_mu<m_pi and a part of energy is lost because of the |
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| 47 | // neutrino radiation), the time scale of the mu- capture process is not clear, |
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| 48 | // but it is clear, that it is well delayed. By this reason the mu- capture is not |
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| 49 | // included in the G4QCaptureAtRest and must be implemented in the "LongLivingDecay" |
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| 50 | // branch of simulation, which includes excited states of nuclei and short living |
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| 51 | // isotopes. On the "Fast Simulation" Level all radioactiv isotopes, long living |
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| 52 | // nuclear excitations, mu-atoms etc, which can be important for the background |
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| 53 | // signals, must be collected in the continuous database and simulated separately. |
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| 54 | // --> CHIPS is SU(3) event generator, so it does not include reactions with the |
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| 55 | // heavy (c,b,t) quarks involved such as tau- or antiDs-, which can be simulated |
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| 56 | // only by SU(6) QUIPS (QUark Invariant Phase Space) model.-December 2003.M.Kossov.- |
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| 57 | // ------------------------------------------------------------------------------- |
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| 58 | // All algorithms are similar: the captured particle is absorbed by a nuclear cluster |
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| 59 | // with the subsequent Quark Exchange nuclear fragmentation. The Anti-Proton (antiSigma+) |
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| 60 | // Capture algorithm is more complicated: the anti-baryon annihilates with the quasyfree |
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| 61 | // nucleons on the nuclear periphery. The peripheral interaction results in a number |
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| 62 | // of mesons. A part of them misses the nucleus and comes directly to the output, |
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| 63 | // while others create Multy Quasmon Excitation in the nucleus with the subsequent |
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| 64 | // Quark Excange Fragmentation of the nucleus. At present the two step mechanism of |
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| 65 | // the antiProton-Nucleus interaction is hardwired in the G4QEnvironment class, but |
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| 66 | // with time the first step of the interaction can be moved to this G4QCaptureAtRest |
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| 67 | // class, to make the G4QEnvirement class simpler and better defined. This is |
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| 68 | // necessary because the G4QEnvironment class is going to loos the previlage of |
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| 69 | // the CHIPS Head Class (as previously the G4Quasmon class lost it) and G4QCollision |
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| 70 | // class is going to be the CHIPS Head Class, where a few Nuclear Environments can |
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| 71 | // exist (e.g. the Nuclear Environment of the Projectile Nucleus and the Nuclear |
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| 72 | // Environment of the Target Nucleus). By the way the antiProton-H1 interaction At |
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| 73 | // Rest (CHIPSI) can be still simulated with only the G4Quasmon class, as this |
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| 74 | // reaction does not have any nuclear environment.- December 2003.Mikhail Kossov.- |
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| 75 | // -------------------------------------------------------------------------------- |
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| 76 | // **************************************************************************************** |
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| 77 | // ********* This HEADER is temporary moved from the photolepton_hadron directory ********* |
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| 78 | // ******* DO NOT MAKE ANY CHANGE! With time it'll move back to photolepton...(M.K.) ****** |
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| 79 | // **************************************************************************************** |
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| 80 | |
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| 81 | #ifndef G4QCaptureAtRest_hh |
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| 82 | #define G4QCaptureAtRest_hh |
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| 83 | |
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| 84 | // GEANT4 Headers |
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| 85 | #include "globals.hh" |
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| 86 | #include "G4ios.hh" |
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| 87 | #include "G4VRestProcess.hh" |
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| 88 | #include "G4ParticleTypes.hh" |
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| 89 | #include "G4VParticleChange.hh" |
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| 90 | #include "G4ParticleDefinition.hh" |
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| 91 | #include "G4DynamicParticle.hh" |
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| 92 | #include "G4NucleiPropertiesTable.hh" |
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| 93 | #include "Randomize.hh" |
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| 94 | #include "G4ThreeVector.hh" |
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| 95 | #include "G4LorentzVector.hh" |
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| 96 | |
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| 97 | // CHIPS Headers |
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| 98 | #include "G4QEnvironment.hh" |
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| 99 | #include "G4QIsotope.hh" |
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| 100 | #include "G4QPDGToG4Particle.hh" |
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| 101 | //<vector> is included in G4QIsotope.hh |
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| 102 | //#include <vector> |
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| 103 | |
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| 104 | class G4QCaptureAtRest : public G4VRestProcess |
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| 105 | { |
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| 106 | private: |
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| 107 | |
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| 108 | // Hide assignment operator as private |
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| 109 | G4QCaptureAtRest& operator=(const G4QCaptureAtRest &right); |
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| 110 | |
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| 111 | // Copy constructor |
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| 112 | G4QCaptureAtRest(const G4QCaptureAtRest& ); |
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| 113 | |
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| 114 | public: |
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| 115 | |
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| 116 | // Constructor |
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| 117 | G4QCaptureAtRest(const G4String& processName ="CHIPSNuclearAbsorptionAtRest"); |
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| 118 | |
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| 119 | // Destructor |
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| 120 | ~G4QCaptureAtRest(); |
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| 121 | |
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| 122 | G4bool IsApplicable(const G4ParticleDefinition& particle); |
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| 123 | |
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| 124 | G4VParticleChange* AtRestDoIt(const G4Track& aTrack, const G4Step& aStep); |
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| 125 | |
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| 126 | G4LorentzVector GetEnegryMomentumConservation(); |
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| 127 | |
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| 128 | G4int GetNumberOfNeutronsInTarget(); |
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| 129 | |
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| 130 | // Static functions |
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| 131 | static void SetManual(); |
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| 132 | static void SetStandard(); |
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| 133 | static void SetParameters(G4double temper=180., G4double ssin2g=.1, G4double etaetap=.3, |
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| 134 | G4double fN=0., G4double fD=0., G4double cP=1., G4double mR=1., |
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| 135 | G4int npCHIPSWorld=234, G4double solAn=.5, G4bool efFlag=false, |
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| 136 | G4double piTh=141.4,G4double mpi2=20000.,G4double dinum=1880.); |
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| 137 | |
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| 138 | protected: |
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| 139 | |
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| 140 | // zero mean lifetime |
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| 141 | G4double GetMeanLifeTime(const G4Track& aTrack, G4ForceCondition* ); |
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| 142 | void MuCaptureEMCascade(G4int Z, G4int N, std::vector<G4double>* dV); |
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| 143 | G4double RandomizeDecayElectron(G4int Z); // Randomize energy of decay electron (in MeV) |
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| 144 | private: |
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| 145 | |
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| 146 | G4bool RandomizeMuDecayOrCapture(G4int Z, G4int N); // true=MuCapture, false=MuDecay |
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| 147 | void CalculateEnergyDepositionOfMuCapture(G4int Z); // (2p->1s, MeV) @@ Now N-independent |
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| 148 | G4bool RandomizeTauDecayOrCapture(G4int Z, G4int N);// true=TauCapture, false=TauDecay |
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| 149 | void CalculateEnergyDepositionOfTauCapture(G4int Z);// (2p->1s, MeV) @@N-independ,Improve |
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| 150 | |
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| 151 | // BODY |
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| 152 | private: |
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| 153 | // Static Parameters |
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| 154 | static G4bool manualFlag; // If false then standard parameters are used |
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| 155 | static G4int nPartCWorld; // The#of particles for hadronization (limit of A of fragm.) |
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| 156 | // -> Parameters of the G4Quasmon class: |
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| 157 | static G4double Temperature; // Quasmon Temperature |
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| 158 | static G4double SSin2Gluons; // Percent of ssbar sea in a constituen gluon |
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| 159 | static G4double EtaEtaprime; // Part of eta-prime in all etas |
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| 160 | // -> Parameters of the G4QNucleus class: |
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| 161 | static G4double freeNuc; // probability of the quasi-free baryon on surface |
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| 162 | static G4double freeDib; // probability of the quasi-free dibaryon on surface |
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| 163 | static G4double clustProb; // clusterization probability in dense region |
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| 164 | static G4double mediRatio; // relative vacuum hadronization probability |
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| 165 | // -> Parameters of the G4QEnvironment class: |
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| 166 | static G4bool EnergyFlux; // Flag for Energy Flux use instead of Multy Quasmon |
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| 167 | static G4double SolidAngle; // Part of Solid Angle to capture secondaries(@@A-dep) |
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| 168 | static G4double PiPrThresh; // Pion Production Threshold for gammas |
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| 169 | static G4double M2ShiftVir; // Shift for M2=-Q2=m_pi^2 of the virtual gamma |
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| 170 | static G4double DiNuclMass; // Double Nucleon Mass for virtual normalization |
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| 171 | // |
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| 172 | // Working parameters |
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| 173 | G4LorentzVector EnMomConservation; // Residual of Energy/Momentum Cons. |
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| 174 | G4int nOfNeutrons; // #of neutrons in the target nucleus |
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| 175 | // Modifires for the reaction |
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| 176 | G4double Time; // Time shift of the capture reaction |
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| 177 | G4double EnergyDeposition; // Energy deposited in the reaction |
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| 178 | |
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| 179 | }; |
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| 180 | #endif |
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