[1199] | 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 | // |
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| 27 | // The lust update: M.V. Kossov, CERN/ITEP(Moscow) 17-June-02 |
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[1340] | 28 | // GEANT4 tag $Name: hadr-chips-V09-03-08 $ |
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[1199] | 29 | // |
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| 30 | // |
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| 31 | // G4 Physics class: G4QPionPlusNuclearCrossSection for gamma+A cross sections |
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| 32 | // Created: M.V. Kossov, CERN/ITEP(Moscow), 20-Dec-03 |
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| 33 | // The last update: M.V. Kossov, CERN/ITEP (Moscow) 15-Feb-04 |
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| 34 | // -------------------------------------------------------------------------------- |
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| 35 | // **************************************************************************************** |
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[1337] | 36 | // This Header is a part of the CHIPS physics package (author: M. Kosov) |
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[1199] | 37 | // **************************************************************************************** |
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| 38 | // Short description: CHIPS cross-sections for pi(plus)-nuclear interactions |
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| 39 | // ------------------------------------------------------------------------------------- |
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| 40 | // |
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| 41 | //#define debug |
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| 42 | //#define pdebug |
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| 43 | //#define debug3 |
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| 44 | //#define debugn |
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| 45 | //#define debugs |
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| 46 | |
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| 47 | #include "G4QPionPlusNuclearCrossSection.hh" |
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| 48 | |
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| 49 | // Initialization of the |
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| 50 | G4double* G4QPionPlusNuclearCrossSection::lastLEN=0; // Pointer to lastArray of LowEn CS |
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| 51 | G4double* G4QPionPlusNuclearCrossSection::lastHEN=0; // Pointer to lastArray of HighEn CS |
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| 52 | G4int G4QPionPlusNuclearCrossSection::lastN=0; // The last N of calculated nucleus |
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| 53 | G4int G4QPionPlusNuclearCrossSection::lastZ=0; // The last Z of calculated nucleus |
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| 54 | G4double G4QPionPlusNuclearCrossSection::lastP=0.; // Last used in cross section Momentum |
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| 55 | G4double G4QPionPlusNuclearCrossSection::lastTH=0.; // Last threshold momentum |
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| 56 | G4double G4QPionPlusNuclearCrossSection::lastCS=0.; // Last value of the Cross Section |
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| 57 | G4int G4QPionPlusNuclearCrossSection::lastI=0; // The last position in the DAMDB |
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| 58 | std::vector<G4double*>* G4QPionPlusNuclearCrossSection::LEN = new std::vector<G4double*>; |
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| 59 | std::vector<G4double*>* G4QPionPlusNuclearCrossSection::HEN = new std::vector<G4double*>; |
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| 60 | |
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| 61 | // Returns Pointer to the G4VQCrossSection class |
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| 62 | G4VQCrossSection* G4QPionPlusNuclearCrossSection::GetPointer() |
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| 63 | { |
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| 64 | static G4QPionPlusNuclearCrossSection theCrossSection; //**Static body of Cross Section** |
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| 65 | return &theCrossSection; |
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| 66 | } |
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| 67 | |
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| 68 | G4QPionPlusNuclearCrossSection::~G4QPionPlusNuclearCrossSection() |
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| 69 | { |
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| 70 | G4int lens=LEN->size(); |
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| 71 | for(G4int i=0; i<lens; ++i) delete[] (*LEN)[i]; |
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| 72 | delete LEN; |
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| 73 | G4int hens=HEN->size(); |
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| 74 | for(G4int i=0; i<hens; ++i) delete[] (*HEN)[i]; |
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| 75 | delete HEN; |
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| 76 | } |
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| 77 | |
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| 78 | // The main member function giving the collision cross section (P is in IU, CS is in mb) |
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| 79 | // Make pMom in independent units ! (Now it is MeV) |
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| 80 | G4double G4QPionPlusNuclearCrossSection::GetCrossSection(G4bool fCS, G4double pMom, |
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| 81 | G4int tgZ, G4int tgN, G4int PDG) |
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| 82 | { |
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| 83 | static G4double tolerance=0.001; // Tolerance (0.1%) to consider as "the same mom" |
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| 84 | static G4int j; // A#0f Z/N-records already tested in AMDB |
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| 85 | static std::vector <G4int> colN; // Vector of N for calculated nuclei (isotops) |
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| 86 | static std::vector <G4int> colZ; // Vector of Z for calculated nuclei (isotops) |
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| 87 | static std::vector <G4double> colP; // Vector of last momenta for the reaction |
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| 88 | static std::vector <G4double> colTH; // Vector of energy thresholds for the reaction |
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| 89 | static std::vector <G4double> colCS; // Vector of last cross sections for the reaction |
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| 90 | // ***---*** End of the mandatory Static Definitions of the Associative Memory ***---*** |
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| 91 | #ifdef debug |
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[1315] | 92 | G4cout<<"G4QPipCS::GetCS:>>>f="<<fCS<<", p="<<pMom<<", Z="<<tgZ<<"("<<lastZ<<") ,N="<<tgN |
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| 93 | <<"("<<lastN<<"),PDG=211, thresh="<<lastTH<<",Sz="<<colN.size()<<G4endl; |
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[1199] | 94 | #endif |
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| 95 | if(PDG!=211) G4cout<<"-Warning-G4QPionPlusCS::GetCS:**Not a PiPlus**,PDG="<<PDG<<G4endl; |
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| 96 | G4bool in=false; // By default the isotope must be found in the AMDB |
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| 97 | if(tgN!=lastN || tgZ!=lastZ) // The nucleus was not the last used isotope |
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| 98 | { |
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| 99 | in = false; // By default the isotope haven't be found in AMDB |
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| 100 | lastP = 0.; // New momentum history (nothing to compare with) |
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| 101 | lastN = tgN; // The last N of the calculated nucleus |
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| 102 | lastZ = tgZ; // The last Z of the calculated nucleus |
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| 103 | lastI = colN.size(); // Size of the Associative Memory DB in the heap |
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| 104 | j = 0; // A#0f records found in DB for this projectile |
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| 105 | #ifdef debug |
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[1315] | 106 | G4cout<<"G4QPipCS::GetCS: the amount of records in the AMDB lastI="<<lastI<<G4endl; |
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[1199] | 107 | #endif |
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| 108 | if(lastI) for(G4int i=0; i<lastI; i++) // AMDB exists, try to find the (Z,N) isotope |
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| 109 | { |
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| 110 | if(colN[i]==tgN && colZ[i]==tgZ) // Try the record "i" in the AMDB |
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| 111 | { |
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| 112 | lastI=i; // Remember the index for future fast/last use |
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| 113 | lastTH =colTH[i]; // The last THreshold (A-dependent) |
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| 114 | #ifdef debug |
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[1315] | 115 | G4cout<<"G4QPipCS::GetCS:*Found*P="<<pMom<<",Threshold="<<lastTH<<",j="<<j<<G4endl; |
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[1199] | 116 | #endif |
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| 117 | if(pMom<=lastTH) |
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| 118 | { |
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| 119 | #ifdef debug |
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[1315] | 120 | G4cout<<"G4QPipCS::GCS:Found,P="<<pMom<<" < Threshold="<<lastTH<<",CS=0"<<G4endl; |
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[1199] | 121 | #endif |
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| 122 | return 0.; // Energy is below the Threshold value |
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| 123 | } |
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| 124 | lastP =colP [i]; // Last Momentum (A-dependent) |
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| 125 | lastCS =colCS[i]; // Last CrossSect (A-dependent) |
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| 126 | if(std::fabs(lastP-pMom)<tolerance*pMom) |
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| 127 | //if(lastP==pMom) // VI do not use tolerance |
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| 128 | { |
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| 129 | #ifdef debug |
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[1315] | 130 | G4cout<<"..G4QPipCS::GetCS:DoNothing,P="<<pMom<<",CS="<<lastCS*millibarn<<G4endl; |
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[1199] | 131 | #endif |
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[1315] | 132 | //CalculateCrossSection(fCS,-1,j,211,lastZ,lastN,pMom); // Update param's only |
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[1199] | 133 | return lastCS*millibarn; // Use theLastCS |
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| 134 | } |
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| 135 | in = true; // This is the case when the isotop is found in DB |
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| 136 | // Momentum pMom is in IU ! @@ Units |
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| 137 | #ifdef debug |
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[1315] | 138 | G4cout<<"G4QPipCS::G:UpdatDB P="<<pMom<<",f="<<fCS<<",I="<<lastI<<",j="<<j<<G4endl; |
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[1199] | 139 | #endif |
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[1315] | 140 | lastCS=CalculateCrossSection(fCS,-1,j,211,lastZ,lastN,pMom); // read & update |
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[1199] | 141 | #ifdef debug |
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[1315] | 142 | G4cout<<"G4QPipNCS::GetCrosSec: *****> New (inDB) Calculated CS="<<lastCS<<G4endl; |
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[1199] | 143 | #endif |
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| 144 | if(lastCS<=0. && pMom>lastTH) // Correct the threshold (@@ No intermediate Zeros) |
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| 145 | { |
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| 146 | #ifdef debug |
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[1315] | 147 | G4cout<<"G4QPipNCS::GetCS: New P="<<pMom<<"(CS=0) > Threshold="<<lastTH<<G4endl; |
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[1199] | 148 | #endif |
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| 149 | lastCS=0.; |
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| 150 | lastTH=pMom; |
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| 151 | } |
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| 152 | break; // Go out of the LOOP |
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| 153 | } |
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| 154 | #ifdef debug |
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[1315] | 155 | G4cout<<"-->G4QPipNucCrossSec::GetCrosSec: pPDG=211, j="<<j<<", N="<<colN[i] |
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[1199] | 156 | <<",Z["<<i<<"]="<<colZ[i]<<G4endl; |
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| 157 | #endif |
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| 158 | j++; // Increment a#0f records found in DB |
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| 159 | } |
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| 160 | #ifdef debug |
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[1315] | 161 | G4cout<<"-?-G4QPipCS::GetCS:R,Z="<<tgZ<<",N="<<tgN<<",in="<<in<<",j="<<j<<" ?"<<G4endl; |
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[1199] | 162 | #endif |
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| 163 | if(!in) // This isotope has not been calculated previously |
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| 164 | { |
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| 165 | #ifdef debug |
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[1315] | 166 | G4cout<<"^^^G4QPipCS::GeCS:CalcNew P="<<pMom<<", f="<<fCS<<", lastI="<<lastI<<G4endl; |
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[1199] | 167 | #endif |
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| 168 | //!!The slave functions must provide cross-sections in millibarns (mb) !! (not in IU) |
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[1315] | 169 | lastCS=CalculateCrossSection(fCS,0,j,211,lastZ,lastN,pMom); //calculate & create |
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[1199] | 170 | //if(lastCS>0.) // It means that the AMBD was initialized |
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| 171 | //{ |
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| 172 | |
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| 173 | lastTH = ThresholdEnergy(tgZ, tgN); // The Threshold Energy which is now the last |
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| 174 | #ifdef debug |
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[1315] | 175 | G4cout<<"G4QPipCrossSection::GetCrossSect:NewThresh="<<lastTH<<",P="<<pMom<<G4endl; |
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[1199] | 176 | #endif |
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| 177 | colN.push_back(tgN); |
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| 178 | colZ.push_back(tgZ); |
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| 179 | colP.push_back(pMom); |
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| 180 | colTH.push_back(lastTH); |
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| 181 | colCS.push_back(lastCS); |
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| 182 | #ifdef debug |
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[1315] | 183 | G4cout<<"G4QPipNCS::GetCrosSec:lCS="<<lastCS<<",lZ="<<lastN<<",lN="<<lastZ<<G4endl; |
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[1199] | 184 | #endif |
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| 185 | //} // M.K. Presence of H1 with high threshold breaks the syncronization |
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| 186 | #ifdef pdebug |
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[1315] | 187 | G4cout<<"G4QPipCS::GeCS:1st,P="<<pMom<<"(MeV),CS="<<lastCS*millibarn<<"(mb)"<<G4endl; |
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[1199] | 188 | #endif |
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| 189 | return lastCS*millibarn; |
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| 190 | } // End of creation of the new set of parameters |
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| 191 | else |
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| 192 | { |
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| 193 | #ifdef debug |
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[1315] | 194 | G4cout<<"G4QPipNucCS::GetCS: Update lastI="<<lastI<<",j="<<j<<G4endl; |
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[1199] | 195 | #endif |
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| 196 | colP[lastI]=pMom; |
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| 197 | colCS[lastI]=lastCS; |
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| 198 | } |
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| 199 | } // End of parameters udate |
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| 200 | else if(pMom<=lastTH) |
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| 201 | { |
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| 202 | #ifdef debug |
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[1315] | 203 | G4cout<<"G4QPipCS::GetCS: Current P="<<pMom<<" < Threshold="<<lastTH<<", CS=0"<<G4endl; |
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[1199] | 204 | #endif |
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| 205 | return 0.; // Momentum is below the Threshold Value -> CS=0 |
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| 206 | } |
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| 207 | else if(std::fabs(lastP-pMom)<tolerance*pMom) |
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| 208 | //else if(lastP==pMom) // VI do not use tolerance |
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| 209 | { |
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| 210 | #ifdef debug |
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| 211 | G4cout<<"..G4QPCS::GetCS:OldNZ&P="<<lastP<<"="<<pMom<<",CS="<<lastCS*millibarn<<G4endl; |
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| 212 | #endif |
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| 213 | return lastCS*millibarn; // Use theLastCS |
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| 214 | } |
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| 215 | else // It is the last used -> use the current tables |
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| 216 | { |
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| 217 | #ifdef debug |
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| 218 | G4cout<<"-!-G4QPCS::GetCS:UseCur P="<<pMom<<",f="<<fCS<<",I="<<lastI<<",j="<<j<<G4endl; |
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| 219 | #endif |
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[1315] | 220 | lastCS=CalculateCrossSection(fCS,1,j,211,lastZ,lastN,pMom); // Only read and UpdateDB |
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[1199] | 221 | lastP=pMom; |
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| 222 | } |
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| 223 | #ifdef debug |
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[1315] | 224 | G4cout<<"==>G4QPipCS::GetCroSec:P="<<pMom<<"(MeV),CS="<<lastCS*millibarn<<"(mb)"<<G4endl; |
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[1199] | 225 | #endif |
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| 226 | return lastCS*millibarn; |
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| 227 | } |
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| 228 | |
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| 229 | // The main member function giving the gamma-A cross section (E in GeV, CS in mb) |
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| 230 | G4double G4QPionPlusNuclearCrossSection::CalculateCrossSection(G4bool, G4int F, G4int I, |
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| 231 | G4int, G4int targZ, G4int targN, G4double Momentum) |
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| 232 | { |
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| 233 | static const G4double THmin=27.; // default minimum Momentum (MeV/c) Threshold |
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| 234 | static const G4double THmiG=THmin*.001; // minimum Momentum (GeV/c) Threshold |
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| 235 | static const G4double dP=10.; // step for the LEN (Low ENergy) table MeV/c |
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| 236 | static const G4double dPG=dP*.001; // step for the LEN (Low ENergy) table GeV/c |
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| 237 | static const G4int nL=105; // A#of LEN points in E (step 10 MeV/c) |
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| 238 | static const G4double Pmin=THmin+(nL-1)*dP; // minP for the HighE part with safety |
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| 239 | static const G4double Pmax=227000.; // maxP for the HEN (High ENergy) part 227 GeV |
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| 240 | static const G4int nH=224; // A#of HEN points in lnE |
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| 241 | static const G4double milP=std::log(Pmin);// Low logarithm energy for the HEN part |
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| 242 | static const G4double malP=std::log(Pmax);// High logarithm energy (each 2.75 percent) |
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| 243 | static const G4double dlP=(malP-milP)/(nH-1); // Step in log energy in the HEN part |
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| 244 | static const G4double milPG=std::log(.001*Pmin);// Low logarithmEnergy for HEN part GeV/c |
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| 245 | #ifdef debug |
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[1315] | 246 | G4cout<<"G4QPipNuCS::CalCS:N="<<targN<<",Z="<<targZ<<",P="<<Momentum<<">"<<THmin<<G4endl; |
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[1199] | 247 | #endif |
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| 248 | G4double sigma=0.; |
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| 249 | if(F&&I) sigma=0.; // @@ *!* Fake line *!* to use F & I !!!Temporary!!! |
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| 250 | G4double A=targN+targZ; // A of the target |
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| 251 | #ifdef debug |
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[1315] | 252 | G4cout<<"G4QPipNucCS::CalCS: A="<<A<<", F="<<F<<",I="<<I<<",nL="<<nL<<",nH="<<nH<<G4endl; |
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[1199] | 253 | #endif |
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| 254 | if(F<=0) // This isotope was not the last used isotop |
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| 255 | { |
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| 256 | if(F<0) // This isotope was found in DAMDB =======> RETRIEVE |
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| 257 | { |
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| 258 | G4int sync=LEN->size(); |
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| 259 | if(sync<=I) G4cerr<<"*!*G4QPiMinusNuclCS::CalcCrosSect:Sync="<<sync<<"<="<<I<<G4endl; |
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| 260 | lastLEN=(*LEN)[I]; // Pointer to prepared LowEnergy cross sections |
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| 261 | lastHEN=(*HEN)[I]; // Pointer to prepared High Energy cross sections |
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| 262 | } |
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| 263 | else // This isotope wasn't calculated before => CREATE |
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| 264 | { |
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| 265 | lastLEN = new G4double[nL]; // Allocate memory for the new LEN cross sections |
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| 266 | lastHEN = new G4double[nH]; // Allocate memory for the new HEN cross sections |
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| 267 | // --- Instead of making a separate function --- |
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| 268 | G4double P=THmiG; // Table threshold in GeV/c |
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| 269 | for(G4int m=0; m<nL; m++) |
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| 270 | { |
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| 271 | lastLEN[m] = CrossSectionLin(targZ, targN, P); |
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| 272 | P+=dPG; |
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| 273 | } |
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| 274 | G4double lP=milPG; |
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| 275 | for(G4int n=0; n<nH; n++) |
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| 276 | { |
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| 277 | lastHEN[n] = CrossSectionLog(targZ, targN, lP); |
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| 278 | lP+=dlP; |
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| 279 | } |
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| 280 | #ifdef debug |
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[1315] | 281 | G4cout<<"-*->G4QPipNucCS::CalcCS:Tab for Z="<<targZ<<", N="<<targN<<",I="<<I<<G4endl; |
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[1199] | 282 | #endif |
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| 283 | // --- End of possible separate function |
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| 284 | // *** The synchronization check *** |
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| 285 | G4int sync=LEN->size(); |
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| 286 | if(sync!=I) |
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| 287 | { |
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| 288 | G4cerr<<"***G4QPiMinusNuclCS::CalcCrossSect: Sinc="<<sync<<"#"<<I<<", Z=" <<targZ |
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| 289 | <<", N="<<targN<<", F="<<F<<G4endl; |
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| 290 | //G4Exception("G4PiMinusNuclearCS::CalculateCS:","39",FatalException,"DBoverflow"); |
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| 291 | } |
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| 292 | LEN->push_back(lastLEN); // remember the Low Energy Table |
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| 293 | HEN->push_back(lastHEN); // remember the High Energy Table |
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| 294 | } // End of creation of the new set of parameters |
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| 295 | } // End of parameters udate |
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| 296 | // ============================== NOW the Magic Formula ================================= |
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| 297 | #ifdef debug |
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[1315] | 298 | G4cout<<"G4QPipNCS::CalcCS:lTH="<<lastTH<<",Pi="<<Pmin<<",dP="<<dP<<",dlP="<<dlP<<G4endl; |
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[1199] | 299 | #endif |
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| 300 | if (Momentum<lastTH) return 0.; // It must be already checked in the interface class |
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| 301 | else if (Momentum<Pmin) // High Energy region |
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| 302 | { |
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| 303 | #ifdef debug |
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[1315] | 304 | G4cout<<"G4QPipNCS::CalcCS:bLEN A="<<A<<", nL="<<nL<<",TH="<<THmin<<",dP="<<dP<<G4endl; |
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[1199] | 305 | #endif |
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| 306 | if(A<=1.) sigma=0.; |
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| 307 | else sigma=EquLinearFit(Momentum,nL,THmin,dP,lastLEN); |
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| 308 | #ifdef debugn |
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| 309 | if(sigma<0.) |
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[1315] | 310 | G4cout<<"G4QPipNuCS::CalCS:A="<<A<<",E="<<Momentum<<",T="<<THmin<<",dP="<<dP<<G4endl; |
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[1199] | 311 | #endif |
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| 312 | } |
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| 313 | else if (Momentum<Pmax) // High Energy region |
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| 314 | { |
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| 315 | G4double lP=std::log(Momentum); |
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| 316 | #ifdef debug |
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[1315] | 317 | G4cout<<"G4QPipNucCS::CalcCS: before HEN nH="<<nH<<", iE="<<milP<<",dlP="<<dlP<<G4endl; |
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[1199] | 318 | #endif |
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| 319 | sigma=EquLinearFit(lP,nH,milP,dlP,lastHEN); |
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| 320 | } |
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| 321 | else // UHE region (calculation, not frequent) |
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| 322 | { |
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| 323 | G4double P=0.001*Momentum; // Approximation formula is for P in GeV/c |
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| 324 | sigma=CrossSectionFormula(targZ, targN, P, std::log(P)); |
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| 325 | } |
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| 326 | #ifdef debug |
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| 327 | G4cout<<"G4QPionPlusNuclearCrossSection::CalcCS: CS="<<sigma<<G4endl; |
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| 328 | #endif |
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| 329 | if(sigma<0.) return 0.; |
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| 330 | return sigma; |
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| 331 | } |
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| 332 | |
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| 333 | // Electromagnetic momentum-threshold (in MeV/c) |
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| 334 | G4double G4QPionPlusNuclearCrossSection::ThresholdMomentum(G4int tZ, G4int tN) |
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| 335 | { |
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| 336 | static const G4double third=1./3.; |
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| 337 | static const G4double pM = G4QPDGCode(211).GetMass(); // Projectile mass in MeV |
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| 338 | static const G4double tpM= pM+pM; // Doubled projectile mass (MeV) |
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| 339 | G4double tA=tZ+tN; |
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| 340 | if(tZ<.99 || tN<0.) return 0.; |
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| 341 | else if(tZ==1 && tN==0) return 300.; // A threshold on the free proton |
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| 342 | //G4double dE=1.263*tZ/(1.+std::pow(tA,third)); |
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| 343 | G4double dE=tZ/(1.+std::pow(tA,third)); // Safety for diffused edge of the nucleus (QE) |
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| 344 | G4double tM=931.5*tA; |
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| 345 | G4double T=dE+dE*(dE/2+pM)/tM; |
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| 346 | return std::sqrt(T*(tpM+T)); |
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| 347 | } |
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| 348 | |
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| 349 | // Calculation formula for piMinus-nuclear inelastic cross-section (mb) (P in GeV/c) |
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| 350 | G4double G4QPionPlusNuclearCrossSection::CrossSectionLin(G4int tZ, G4int tN, G4double P) |
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| 351 | { |
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| 352 | G4double lP=std::log(P); |
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| 353 | return CrossSectionFormula(tZ, tN, P, lP); |
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| 354 | } |
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| 355 | |
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| 356 | // Calculation formula for piMinus-nuclear inelastic cross-section (mb) log(P in GeV/c) |
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| 357 | G4double G4QPionPlusNuclearCrossSection::CrossSectionLog(G4int tZ, G4int tN, G4double lP) |
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| 358 | { |
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| 359 | G4double P=std::exp(lP); |
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| 360 | return CrossSectionFormula(tZ, tN, P, lP); |
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| 361 | } |
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| 362 | // Calculation formula for piMinus-nuclear inelastic cross-section (mb) log(P in GeV/c) |
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| 363 | G4double G4QPionPlusNuclearCrossSection::CrossSectionFormula(G4int tZ, G4int tN, |
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| 364 | G4double P, G4double lP) |
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| 365 | { |
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| 366 | G4double sigma=0.; |
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| 367 | if(tZ==1 && !tN) // PiPlus-Proton interaction from G4QuasiElRatios |
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| 368 | { |
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| 369 | G4double ld=lP-3.5; |
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| 370 | G4double ld2=ld*ld; |
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| 371 | G4double p2=P*P; |
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| 372 | G4double p4=p2*p2; |
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| 373 | G4double sp=std::sqrt(P); |
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| 374 | G4double lm=lP-.32; |
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| 375 | G4double md=lm*lm+.04; |
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| 376 | G4double El=(.0557*ld2+2.4+6./sp)/(1.+3./p4); |
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| 377 | G4double To=(.3*ld2+22.3+5./sp)/(1.+1./p4); |
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| 378 | sigma=(To-El)+.1/md; |
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| 379 | } |
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| 380 | else if(tZ==1 && tN==1) // pimp_tot |
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| 381 | { |
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| 382 | G4double p2=P*P; |
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| 383 | G4double d=lP-2.7; |
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| 384 | G4double f=lP+1.25; |
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| 385 | G4double g=lP-.017; |
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| 386 | sigma=(.55*d*d+38.+23./std::sqrt(P))/(1.+.3/p2/p2)+18./(f*f+.1089)+.02/(g*g+.0025); |
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| 387 | } |
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| 388 | else if(tZ<97 && tN<152) // General solution |
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| 389 | { |
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| 390 | G4double d=lP-4.2; |
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| 391 | G4double p2=P*P; |
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| 392 | G4double p4=p2*p2; |
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| 393 | G4double a=tN+tZ; // A of the target |
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| 394 | G4double al=std::log(a); |
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| 395 | G4double sa=std::sqrt(a); |
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| 396 | G4double ssa=std::sqrt(sa); |
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| 397 | G4double a2=a*a; |
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| 398 | G4double c=41.*std::exp(al*.68)*(1.+44./a2)/(1.+8./a)/(1.+200./a2/a2); |
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| 399 | G4double f=290.*ssa/(1.+34./a/ssa); |
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| 400 | G4double g=-1.32-al*.043; |
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| 401 | G4double u=lP-g; |
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| 402 | G4double h=al*(.4-.055*al); |
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| 403 | G4double r=.01+a2*5.E-8; |
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| 404 | sigma=(c+d*d)/(1.+(.2-.009*sa)/p4)+f/(u*u+h*h)/(1.+r/p2); |
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| 405 | #ifdef pdebug |
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| 406 | G4cout<<"G4QPiPlusNucCS::CSForm: A="<<a<<",P="<<P<<",CS="<<sigma<<",c="<<c<<",g="<<g |
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| 407 | <<",d="<<d<<",r="<<r<<",e="<<e<<",h="<<h<<G4endl; |
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| 408 | #endif |
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| 409 | } |
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| 410 | else |
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| 411 | { |
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| 412 | G4cerr<<"-Warning-G4QPiPlusNuclearCroSect::CSForm:*Bad A* Z="<<tZ<<", N="<<tN<<G4endl; |
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| 413 | sigma=0.; |
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| 414 | } |
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| 415 | if(sigma<0.) return 0.; |
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| 416 | return sigma; |
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| 417 | } |
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