[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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[1315] | 25 | // $Id: G4NonEquilibriumEvaporator.cc,v 1.29 2010/05/21 17:56:34 mkelsey Exp $ |
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| 26 | // Geant4 tag: $Name: geant4-09-04-beta-cand-01 $ |
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[819] | 27 | // |
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[1315] | 28 | // 20100114 M. Kelsey -- Remove G4CascadeMomentum, use G4LorentzVector directly |
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| 29 | // 20100309 M. Kelsey -- Use new generateWithRandomAngles for theta,phi stuff; |
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| 30 | // eliminate some unnecessary std::pow() |
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| 31 | // 20100412 M. Kelsey -- Pass G4CollisionOutput by ref to ::collide() |
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| 32 | // 20100413 M. Kelsey -- Pass buffers to paraMaker[Truncated] |
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| 33 | // 20100517 M. Kelsey -- Inherit from common base class |
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| 34 | |
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[819] | 35 | #define RUN |
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| 36 | |
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| 37 | #include <cmath> |
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| 38 | #include "G4NonEquilibriumEvaporator.hh" |
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[1315] | 39 | #include "G4CollisionOutput.hh" |
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[819] | 40 | #include "G4InuclElementaryParticle.hh" |
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| 41 | #include "G4InuclNuclei.hh" |
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[1315] | 42 | #include "G4InuclSpecialFunctions.hh" |
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[819] | 43 | #include "G4LorentzConvertor.hh" |
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[1315] | 44 | #include "G4NucleiProperties.hh" |
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| 45 | #include "G4HadTmpUtil.hh" |
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[819] | 46 | |
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[1315] | 47 | using namespace G4InuclSpecialFunctions; |
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| 48 | |
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| 49 | |
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[819] | 50 | G4NonEquilibriumEvaporator::G4NonEquilibriumEvaporator() |
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[1315] | 51 | : G4VCascadeCollider("G4NonEquilibriumEvaporator") {} |
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[819] | 52 | |
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| 53 | |
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[1315] | 54 | void G4NonEquilibriumEvaporator::collide(G4InuclParticle* /*bullet*/, |
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| 55 | G4InuclParticle* target, |
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| 56 | G4CollisionOutput& output) { |
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[819] | 57 | |
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| 58 | if (verboseLevel > 3) { |
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| 59 | G4cout << " >>> G4NonEquilibriumEvaporator::collide" << G4endl; |
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| 60 | } |
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| 61 | |
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[1315] | 62 | // Sanity check |
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| 63 | G4InuclNuclei* nuclei_target = dynamic_cast<G4InuclNuclei*>(target); |
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| 64 | if (!nuclei_target) { |
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| 65 | G4cerr << " NonEquilibriumEvaporator -> target is not nuclei " << G4endl; |
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| 66 | return; |
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| 67 | } |
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| 68 | |
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[819] | 69 | const G4double a_cut = 5.0; |
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| 70 | const G4double z_cut = 3.0; |
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| 71 | |
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| 72 | #ifdef RUN |
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| 73 | const G4double eexs_cut = 0.1; |
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| 74 | #else |
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| 75 | const G4double eexs_cut = 100000.0; |
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| 76 | #endif |
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| 77 | |
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| 78 | const G4double coul_coeff = 1.4; |
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| 79 | const G4int itry_max = 1000; |
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| 80 | const G4double small_ekin = 1.0e-6; |
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| 81 | const G4double width_cut = 0.005; |
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| 82 | |
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| 83 | G4double A = nuclei_target->getA(); |
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| 84 | G4double Z = nuclei_target->getZ(); |
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[1315] | 85 | G4LorentzVector PEX = nuclei_target->getMomentum(); |
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| 86 | G4LorentzVector pin = PEX; |
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[819] | 87 | G4double EEXS = nuclei_target->getExitationEnergy(); |
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[1315] | 88 | pin.setE(pin.e() + 0.001 * EEXS); |
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[819] | 89 | G4InuclNuclei dummy_nuc; |
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| 90 | G4ExitonConfiguration config = nuclei_target->getExitonConfiguration(); |
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| 91 | |
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| 92 | G4double QPP = config.protonQuasiParticles; |
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| 93 | |
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| 94 | G4double QNP = config.neutronQuasiParticles; |
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| 95 | |
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| 96 | G4double QPH = config.protonHoles; |
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| 97 | |
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| 98 | G4double QNH = config.neutronHoles; |
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| 99 | |
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| 100 | G4double QP = QPP + QNP; |
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| 101 | G4double QH = QPH + QNH; |
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| 102 | G4double QEX = QP + QH; |
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| 103 | G4InuclElementaryParticle dummy(small_ekin, 1); |
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| 104 | G4LorentzConvertor toTheExitonSystemRestFrame; |
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| 105 | |
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[1315] | 106 | toTheExitonSystemRestFrame.setBullet(dummy); |
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[819] | 107 | |
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| 108 | G4double EFN = FermiEnergy(A, Z, 0); |
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| 109 | G4double EFP = FermiEnergy(A, Z, 1); |
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| 110 | |
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| 111 | G4double AR = A - QP; |
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| 112 | G4double ZR = Z - QPP; |
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| 113 | G4int NEX = G4int(QEX + 0.5); |
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[1315] | 114 | G4LorentzVector ppout; |
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| 115 | G4bool try_again = (NEX > 0); |
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[819] | 116 | |
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[1315] | 117 | // Buffer for parameter sets |
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| 118 | std::pair<G4double, G4double> parms; |
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| 119 | |
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[819] | 120 | while (try_again) { |
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| 121 | |
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| 122 | if (A >= a_cut && Z >= z_cut && EEXS > eexs_cut) { // ok |
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| 123 | |
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| 124 | if (verboseLevel > 2) { |
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| 125 | G4cout << " A " << A << " Z " << Z << " EEXS " << EEXS << G4endl; |
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| 126 | } |
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| 127 | |
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| 128 | // update exiton system |
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| 129 | G4double nuc_mass = dummy_nuc.getNucleiMass(A, Z); |
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[1315] | 130 | PEX.setVectM(PEX.vect(), nuc_mass); |
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[819] | 131 | toTheExitonSystemRestFrame.setTarget(PEX, nuc_mass); |
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| 132 | toTheExitonSystemRestFrame.toTheTargetRestFrame(); |
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| 133 | G4double MEL = getMatrixElement(A); |
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| 134 | G4double E0 = getE0(A); |
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| 135 | G4double PL = getParLev(A, Z); |
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| 136 | G4double parlev = PL / A; |
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| 137 | G4double EG = PL * EEXS; |
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| 138 | |
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| 139 | if (QEX < std::sqrt(2.0 * EG)) { // ok |
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| 140 | |
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[1315] | 141 | paraMakerTruncated(Z, parms); |
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| 142 | const G4double& AK1 = parms.first; |
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| 143 | const G4double& CPA1 = parms.second; |
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[819] | 144 | |
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[1315] | 145 | G4double VP = coul_coeff * Z * AK1 / (G4cbrt(A - 1.0) + 1.0) / |
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[819] | 146 | (1.0 + EEXS / E0); |
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[1315] | 147 | // G4double DM1 = bindingEnergy(A, Z); |
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| 148 | // G4double BN = DM1 - bindingEnergy(A - 1.0, Z); |
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| 149 | // G4double BP = DM1 - bindingEnergy(A - 1.0, Z - 1.0); |
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| 150 | G4double DM1 = G4NucleiProperties::GetBindingEnergy(G4lrint(A), G4lrint(Z)); |
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| 151 | G4double BN = DM1 - G4NucleiProperties::GetBindingEnergy(G4lrint(A-1.0), G4lrint(Z)); |
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| 152 | G4double BP = DM1 - G4NucleiProperties::GetBindingEnergy(G4lrint(A-1.0), G4lrint(Z-1.0)); |
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[819] | 153 | G4double EMN = EEXS - BN; |
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| 154 | G4double EMP = EEXS - BP - VP * A / (A - 1.0); |
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| 155 | G4double ESP = 0.0; |
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| 156 | |
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| 157 | if (EMN > eexs_cut) { // ok |
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| 158 | G4int icase = 0; |
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| 159 | |
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| 160 | if (NEX > 1) { |
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| 161 | G4double APH = 0.25 * (QP * QP + QH * QH + QP - 3.0 * QH); |
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| 162 | G4double APH1 = APH + 0.5 * (QP + QH); |
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| 163 | ESP = EEXS / QEX; |
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[1315] | 164 | G4double MELE = MEL / ESP / (A*A*A); |
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[819] | 165 | |
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| 166 | if (ESP > 15.0) { |
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| 167 | MELE *= std::sqrt(15.0 / ESP); |
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| 168 | |
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| 169 | } else if(ESP < 7.0) { |
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| 170 | MELE *= std::sqrt(ESP / 7.0); |
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| 171 | |
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| 172 | if (ESP < 2.0) MELE *= std::sqrt(ESP / 2.0); |
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| 173 | }; |
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| 174 | |
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| 175 | G4double F1 = EG - APH; |
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| 176 | G4double F2 = EG - APH1; |
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| 177 | |
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| 178 | if (F1 > 0.0 && F2 > 0.0) { |
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| 179 | G4double F = F2 / F1; |
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| 180 | G4double M1 = 2.77 * MELE * PL; |
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| 181 | std::vector<G4double> D(3, 0.0); |
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| 182 | D[0] = M1 * F2 * F2 * std::pow(F, NEX - 1) / (QEX + 1.0); |
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| 183 | |
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| 184 | if (D[0] > 0.0) { |
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| 185 | |
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| 186 | if (NEX >= 2) { |
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[1315] | 187 | D[1] = 0.0462 / parlev / G4cbrt(A) * QP * EEXS / QEX; |
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[819] | 188 | |
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| 189 | if (EMP > eexs_cut) |
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| 190 | D[2] = D[1] * std::pow(EMP / EEXS, NEX) * (1.0 + CPA1); |
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| 191 | D[1] *= std::pow(EMN / EEXS, NEX) * getAL(A); |
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| 192 | |
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| 193 | if (QNP < 1.0) D[1] = 0.0; |
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| 194 | |
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| 195 | if (QPP < 1.0) D[2] = 0.0; |
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| 196 | |
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| 197 | try_again = NEX > 1 && (D[1] > width_cut * D[0] || |
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| 198 | D[2] > width_cut * D[0]); |
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| 199 | |
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| 200 | if (try_again) { |
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| 201 | G4double D5 = D[0] + D[1] + D[2]; |
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| 202 | G4double SL = D5 * inuclRndm(); |
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| 203 | G4double S1 = 0.; |
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| 204 | |
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| 205 | for (G4int i = 0; i < 3; i++) { |
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| 206 | S1 += D[i]; |
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| 207 | |
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| 208 | if (SL <= S1) { |
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| 209 | icase = i; |
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| 210 | |
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| 211 | break; |
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| 212 | }; |
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| 213 | }; |
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| 214 | }; |
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| 215 | }; |
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| 216 | |
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| 217 | } else { |
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| 218 | try_again = false; |
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| 219 | }; |
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| 220 | |
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| 221 | } else { |
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| 222 | try_again = false; |
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| 223 | }; |
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| 224 | }; |
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| 225 | |
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| 226 | if (try_again) { |
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| 227 | |
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| 228 | if (icase > 0) { // N -> N - 1 with particle escape |
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| 229 | G4double V = 0.0; |
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| 230 | G4int ptype = 0; |
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| 231 | G4double B = 0.0; |
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| 232 | |
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| 233 | if (A < 3.0) try_again = false; |
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| 234 | |
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| 235 | if (try_again) { |
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| 236 | |
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| 237 | if (icase == 1) { // neutron escape |
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| 238 | |
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| 239 | if (QNP < 1.0) { |
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| 240 | icase = 0; |
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| 241 | |
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| 242 | } else { |
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| 243 | B = BN; |
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| 244 | V = 0.0; |
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| 245 | ptype = 2; |
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| 246 | }; |
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| 247 | |
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| 248 | } else { // proton esape |
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| 249 | if (QPP < 1.0) { |
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| 250 | icase = 0; |
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| 251 | |
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| 252 | } else { |
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| 253 | B = BP; |
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| 254 | V = VP; |
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| 255 | ptype = 1; |
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| 256 | |
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| 257 | if (Z - 1.0 < 1.0) try_again = false; |
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| 258 | }; |
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| 259 | }; |
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| 260 | |
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| 261 | if (try_again && icase != 0) { |
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| 262 | G4double EB = EEXS - B; |
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| 263 | G4double E = EB - V * A / (A - 1.0); |
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| 264 | |
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| 265 | if (E < 0.0) { |
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| 266 | icase = 0; |
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| 267 | |
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| 268 | } else { |
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| 269 | G4double E1 = EB - V; |
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| 270 | G4double EEXS_new = -1.; |
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| 271 | G4double EPART = 0.0; |
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| 272 | G4int itry1 = 0; |
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| 273 | G4bool bad = true; |
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| 274 | |
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| 275 | while (itry1 < itry_max && icase > 0 && bad) { |
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| 276 | itry1++; |
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| 277 | G4int itry = 0; |
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| 278 | |
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| 279 | while (EEXS_new < 0.0 && itry < itry_max) { |
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| 280 | itry++; |
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| 281 | G4double R = inuclRndm(); |
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| 282 | G4double X; |
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| 283 | |
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| 284 | if (NEX == 2) { |
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| 285 | X = 1.0 - std::sqrt(R); |
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| 286 | |
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| 287 | } else { |
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| 288 | G4double QEX2 = 1.0 / QEX; |
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| 289 | G4double QEX1 = 1.0 / (QEX - 1.0); |
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| 290 | X = std::pow(0.5 * R, QEX2); |
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| 291 | |
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| 292 | for (G4int i = 0; i < 1000; i++) { |
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| 293 | G4double DX = X * QEX1 * |
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| 294 | (1.0 + QEX2 * X * (1.0 - R / std::pow(X, NEX)) / (1.0 - X)); |
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| 295 | X -= DX; |
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| 296 | |
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| 297 | if (std::fabs(DX / X) < 0.01) break; |
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| 298 | |
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| 299 | }; |
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| 300 | }; |
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| 301 | EPART = EB - X * E1; |
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| 302 | EEXS_new = EB - EPART * A / (A - 1.0); |
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| 303 | }; |
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| 304 | |
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| 305 | if (itry == itry_max || EEXS_new < 0.0) { |
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| 306 | icase = 0; |
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| 307 | |
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| 308 | } else { // real escape |
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| 309 | G4InuclElementaryParticle particle(ptype); |
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| 310 | |
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| 311 | particle.setModel(5); |
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| 312 | G4double mass = particle.getMass(); |
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| 313 | EPART *= 0.001; // to the GeV |
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| 314 | // generate particle momentum |
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| 315 | G4double pmod = std::sqrt(EPART * (2.0 * mass + EPART)); |
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[1315] | 316 | G4LorentzVector mom = generateWithRandomAngles(pmod,mass); |
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| 317 | G4LorentzVector mom_at_rest; |
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[819] | 318 | |
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| 319 | G4double QPP_new = QPP; |
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| 320 | G4double Z_new = Z; |
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| 321 | |
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| 322 | if (ptype == 1) { |
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| 323 | QPP_new -= 1.; |
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| 324 | Z_new -= 1.0; |
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| 325 | }; |
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| 326 | |
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| 327 | G4double QNP_new = QNP; |
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| 328 | |
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| 329 | if (ptype == 2) QNP_new -= 1.0; |
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| 330 | |
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| 331 | G4double A_new = A - 1.0; |
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| 332 | G4double new_exiton_mass = |
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| 333 | dummy_nuc.getNucleiMass(A_new, Z_new); |
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[1315] | 334 | mom_at_rest.setVectM(-mom.vect(), new_exiton_mass); |
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[819] | 335 | |
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[1315] | 336 | G4LorentzVector part_mom = |
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[819] | 337 | toTheExitonSystemRestFrame.backToTheLab(mom); |
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[1315] | 338 | part_mom.setVectM(part_mom.vect(), mass); |
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[819] | 339 | |
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[1315] | 340 | G4LorentzVector ex_mom = |
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[819] | 341 | toTheExitonSystemRestFrame.backToTheLab(mom_at_rest); |
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[1315] | 342 | ex_mom.setVectM(ex_mom.vect(), new_exiton_mass); |
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[819] | 343 | |
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| 344 | // check energy conservation and set new exitation energy |
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[1315] | 345 | EEXS_new = 1000.0 * (PEX.e() + 0.001 * EEXS - |
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| 346 | part_mom.e() - ex_mom.e()); |
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[819] | 347 | |
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| 348 | if (EEXS_new > 0.0) { // everything ok |
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| 349 | particle.setMomentum(part_mom); |
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| 350 | output.addOutgoingParticle(particle); |
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[1315] | 351 | ppout += part_mom; |
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[819] | 352 | |
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| 353 | A = A_new; |
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| 354 | Z = Z_new; |
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| 355 | PEX = ex_mom; |
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| 356 | EEXS = EEXS_new; |
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| 357 | NEX -= 1; |
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| 358 | QEX -= 1; |
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| 359 | QP -= 1.0; |
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| 360 | QPP = QPP_new; |
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| 361 | QNP = QNP_new; |
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| 362 | bad = false; |
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| 363 | }; |
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| 364 | }; |
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| 365 | }; |
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| 366 | |
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| 367 | if (itry1 == itry_max) icase = 0; |
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| 368 | }; |
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| 369 | }; |
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| 370 | }; |
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| 371 | }; |
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| 372 | |
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| 373 | if (icase == 0 && try_again) { // N -> N + 2 |
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| 374 | G4double TNN = 1.6 * EFN + ESP; |
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| 375 | G4double TNP = 1.6 * EFP + ESP; |
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| 376 | G4double XNUN = 1.0 / (1.6 + ESP / EFN); |
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| 377 | G4double XNUP = 1.0 / (1.6 + ESP / EFP); |
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| 378 | G4double SNN1 = csNN(TNP) * XNUP; |
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| 379 | G4double SNN2 = csNN(TNN) * XNUN; |
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| 380 | G4double SPN1 = csPN(TNP) * XNUP; |
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| 381 | G4double SPN2 = csPN(TNN) * XNUN; |
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| 382 | G4double PP = (QPP * SNN1 + QNP * SPN1) * ZR; |
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| 383 | G4double PN = (QPP * SPN2 + QNP * SNN2) * (AR - ZR); |
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| 384 | G4double PW = PP + PN; |
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| 385 | NEX += 2; |
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| 386 | QEX += 2.0; |
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| 387 | QP += 1.0; |
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| 388 | QH += 1.0; |
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| 389 | AR -= 1.0; |
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| 390 | |
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| 391 | if (AR > 1.0) { |
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| 392 | G4double SL = PW * inuclRndm(); |
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| 393 | |
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| 394 | if (SL > PP) { |
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| 395 | QNP += 1.0; |
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| 396 | QNH += 1.0; |
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| 397 | |
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| 398 | } else { |
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| 399 | QPP += 1.0; |
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| 400 | QPH += 1.0; |
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| 401 | ZR -= 1.0; |
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| 402 | |
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| 403 | if (ZR < 2.0) try_again = false; |
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| 404 | |
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| 405 | }; |
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| 406 | |
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| 407 | } else { |
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| 408 | try_again = false; |
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| 409 | }; |
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| 410 | }; |
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| 411 | }; |
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| 412 | |
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| 413 | } else { |
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| 414 | try_again = false; |
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| 415 | }; |
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| 416 | |
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| 417 | } else { |
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| 418 | try_again = false; |
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| 419 | }; |
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| 420 | |
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| 421 | } else { |
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| 422 | try_again = false; |
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| 423 | }; |
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| 424 | }; |
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| 425 | // everything finished, set output nuclei |
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| 426 | // the exitation energy has to be re-set properly for the energy |
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| 427 | // conservation |
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| 428 | |
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[1315] | 429 | G4LorentzVector pnuc = pin - ppout; |
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[819] | 430 | G4InuclNuclei nuclei(pnuc, A, Z); |
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| 431 | |
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| 432 | nuclei.setModel(5); |
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| 433 | nuclei.setEnergy(); |
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| 434 | |
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| 435 | pnuc = nuclei.getMomentum(); |
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[1315] | 436 | G4double eout = pnuc.e() + ppout.e(); |
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| 437 | G4double eex_real = 1000.0 * (pin.e() - eout); |
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[819] | 438 | |
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| 439 | nuclei.setExitationEnergy(eex_real); |
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| 440 | output.addTargetFragment(nuclei); |
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| 441 | |
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[1315] | 442 | return; |
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[819] | 443 | } |
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| 444 | |
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| 445 | G4double G4NonEquilibriumEvaporator::getMatrixElement(G4double A) const { |
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| 446 | |
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| 447 | if (verboseLevel > 3) { |
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| 448 | G4cout << " >>> G4NonEquilibriumEvaporator::getMatrixElement" << G4endl; |
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| 449 | } |
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| 450 | |
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| 451 | G4double me; |
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| 452 | |
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| 453 | if (A > 150.0) { |
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| 454 | me = 100.0; |
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| 455 | |
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| 456 | } else if(A > 20.0) { |
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| 457 | me = 140.0; |
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| 458 | |
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| 459 | } else { |
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| 460 | me = 70.0; |
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| 461 | }; |
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| 462 | |
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| 463 | return me; |
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| 464 | } |
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| 465 | |
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| 466 | G4double G4NonEquilibriumEvaporator::getE0(G4double ) const { |
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| 467 | |
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| 468 | if (verboseLevel > 3) { |
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| 469 | G4cout << " >>> G4NonEquilibriumEvaporator::getEO" << G4endl; |
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| 470 | } |
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| 471 | |
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| 472 | const G4double e0 = 200.0; |
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| 473 | |
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| 474 | return e0; |
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| 475 | } |
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| 476 | |
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| 477 | G4double G4NonEquilibriumEvaporator::getParLev(G4double A, |
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| 478 | G4double ) const { |
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| 479 | |
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| 480 | if (verboseLevel > 3) { |
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| 481 | G4cout << " >>> G4NonEquilibriumEvaporator::getParLev" << G4endl; |
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| 482 | } |
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| 483 | |
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| 484 | // const G4double par = 0.125; |
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| 485 | G4double pl = 0.125 * A; |
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| 486 | |
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| 487 | return pl; |
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| 488 | } |
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