[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 | // |
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| 27 | // The lust update: M.V. Kossov, CERN/ITEP(Moscow) 17-June-02 |
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| 28 | // GEANT4 tag $Name: geant4-09-01-patch-02 $ |
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| 29 | // |
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| 30 | // |
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| 31 | // G4 Physics class: G4QNeutronNuclearCrossSection for gamma+A cross sections |
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| 32 | // @@ A preliminary temporary class identical to G4QProtonNuclearCS. Must be improved. @@ |
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| 33 | // Created: M.V. Kossov, CERN/ITEP(Moscow), 20-Dec-03 |
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| 34 | // The last update: M.V. Kossov, CERN/ITEP (Moscow) 15-Feb-04 |
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| 35 | // -------------------------------------------------------------------------------- |
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| 36 | // **************************************************************************************** |
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| 37 | // ****** This CLASS is a property of the CHIPS hadronic package in Geant4 (M. Kosov) ***** |
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| 38 | // *********** DO NOT MAKE ANY CHANGE without approval of Mikhail.Kossov@cern.ch ********** |
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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 "G4QNeutronNuclearCrossSection.hh" |
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| 48 | |
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| 49 | // Initialization of the |
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| 50 | G4double* G4QNeutronNuclearCrossSection::lastLEN=0; // Pointer to the lastArray of LowEn CS |
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| 51 | G4double* G4QNeutronNuclearCrossSection::lastHEN=0; // Pointer to the lastArray of HighEn CS |
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| 52 | G4int G4QNeutronNuclearCrossSection::lastN=0; // The last N of calculated nucleus |
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| 53 | G4int G4QNeutronNuclearCrossSection::lastZ=0; // The last Z of calculated nucleus |
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| 54 | G4double G4QNeutronNuclearCrossSection::lastP=0.; // Last used in cross section Momentum |
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| 55 | G4double G4QNeutronNuclearCrossSection::lastTH=0.; // Last threshold momentum |
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| 56 | G4double G4QNeutronNuclearCrossSection::lastCS=0.; // Last value of the Cross Section |
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| 57 | G4int G4QNeutronNuclearCrossSection::lastI=0; // The last position in the DAMDB |
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| 58 | |
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| 59 | // Returns Pointer to the G4VQCrossSection class |
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| 60 | G4VQCrossSection* G4QNeutronNuclearCrossSection::GetPointer() |
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| 61 | { |
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| 62 | static G4QNeutronNuclearCrossSection theCrossSection; //**Static body of Cross Section** |
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| 63 | return &theCrossSection; |
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| 64 | } |
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| 65 | |
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| 66 | // The main member function giving the collision cross section (P is in IU, CS is in mb) |
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| 67 | // Make pMom in independent units ! (Now it is MeV) |
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| 68 | G4double G4QNeutronNuclearCrossSection::GetCrossSection(G4bool fCS, G4double pMom, |
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| 69 | G4int tgZ, G4int tgN, G4int) |
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| 70 | { |
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| 71 | static G4int j; // A#0f records found in DB for this projectile |
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| 72 | static std::vector <G4int> colN; // Vector of N for calculated nuclei (isotops) |
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| 73 | static std::vector <G4int> colZ; // Vector of Z for calculated nuclei (isotops) |
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| 74 | static std::vector <G4double> colP; // Vector of last momenta for the reaction |
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| 75 | static std::vector <G4double> colTH; // Vector of energy thresholds for the reaction |
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| 76 | static std::vector <G4double> colCS; // Vector of last cross sections for the reaction |
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| 77 | // ***---*** End of the mandatory Static Definitions of the Associative Memory ***---*** |
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| 78 | G4double pEn=pMom; |
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| 79 | #ifdef pdebug |
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| 80 | G4cout<<"G4QNtCS::GetCS:>>> f="<<fCS<<", p="<<pMom<<", Z="<<tgZ<<"("<<lastZ<<") ,N="<<tgN |
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| 81 | <<"("<<lastN<<"),PDG=2212, P="<<pEn<<"("<<lastTH<<")"<<",Sz="<<colN.size()<<G4endl; |
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| 82 | #endif |
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| 83 | G4bool in=false; // By default the isotope must be found in the AMDB |
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| 84 | if(tgN!=lastN || tgZ!=lastZ) // The nucleus was not the last used isotope |
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| 85 | { |
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| 86 | in = false; // By default the isotope haven't be found in AMDB |
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| 87 | lastP = 0.; // New momentum history (nothing to compare with) |
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| 88 | lastN = tgN; // The last N of the calculated nucleus |
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| 89 | lastZ = tgZ; // The last Z of the calculated nucleus |
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| 90 | lastI = colN.size(); // Size of the Associative Memory DB in the heap |
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| 91 | j = 0; // A#0f records found in DB for this projectile |
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| 92 | if(lastI) for(G4int i=0; i<lastI; i++) // The partType is found |
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| 93 | { // The nucleus with is found in AMDB |
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| 94 | if(colN[i]==tgN && colZ[i]==tgZ) |
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| 95 | { |
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| 96 | lastI=i; |
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| 97 | lastTH =colTH[i]; // Last THreshold (A-dependent) |
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| 98 | #ifdef pdebug |
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| 99 | G4cout<<"G4QNtCS::GetCS:*Found* P="<<pMom<<",Threshold="<<lastTH<<",j="<<j<<G4endl; |
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| 100 | #endif |
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| 101 | if(pEn<=lastTH) |
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| 102 | { |
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| 103 | #ifdef pdebug |
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| 104 | G4cout<<"G4QNtCS::GetCS:Found T="<<pEn<<" < Threshold="<<lastTH<<",CS=0"<<G4endl; |
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| 105 | #endif |
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| 106 | return 0.; // Energy is below the Threshold value |
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| 107 | } |
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| 108 | lastP =colP [i]; // Last Momentum (A-dependent) |
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| 109 | lastCS =colCS[i]; // Last CrossSect (A-dependent) |
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| 110 | // if(std::fabs(lastP/pMom-1.)<tolerance) |
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| 111 | if(lastP==pMom) // VI do not use tolerance |
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| 112 | { |
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| 113 | #ifdef pdebug |
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| 114 | G4cout<<"G4QNeutronNuclCS::GetCS:P="<<pMom<<",CS="<<lastCS*millibarn<<G4endl; |
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| 115 | #endif |
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| 116 | CalculateCrossSection(fCS,-1,j,2212,lastZ,lastN,pMom); // Update param's only |
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| 117 | return lastCS*millibarn; // Use theLastCS |
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| 118 | } |
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| 119 | in = true; // This is the case when the isotop is found in DB |
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| 120 | // Momentum pMom is in IU ! @@ Units |
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| 121 | #ifdef pdebug |
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| 122 | G4cout<<"G4QNtCS::G:UpdatDB P="<<pMom<<",f="<<fCS<<",lI="<<lastI<<",j="<<j<<G4endl; |
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| 123 | #endif |
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| 124 | lastCS=CalculateCrossSection(fCS,-1,j,2212,lastZ,lastN,pMom); // read & update |
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| 125 | #ifdef pdebug |
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| 126 | G4cout<<"G4QNeutronCS::GetCrosSec:*****>New (inDB) Calculated CS="<<lastCS<<G4endl; |
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| 127 | #endif |
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| 128 | if(lastCS<=0. && pEn>lastTH) // Correct the threshold |
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| 129 | { |
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| 130 | #ifdef pdebug |
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| 131 | G4cout<<"G4QNtCS::GetCS: New T="<<pEn<<"(CS=0) > Threshold="<<lastTH<<G4endl; |
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| 132 | #endif |
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| 133 | lastTH=pEn; |
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| 134 | } |
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| 135 | break; // Go out of the LOOP |
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| 136 | } |
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| 137 | #ifdef pdebug |
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| 138 | G4cout<<"-->G4QNeutronNuclearCrossSec::GetCrosSec: pPDG=2212, j="<<j<<", N="<<colN[i] |
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| 139 | <<",Z["<<i<<"]="<<colZ[i]<<G4endl; |
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| 140 | #endif |
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| 141 | j++; // Increment a#0f records found in DB |
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| 142 | } |
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| 143 | if(!in) // This nucleus has not been calculated previously |
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| 144 | { |
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| 145 | #ifdef pdebug |
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| 146 | G4cout<<"G4QNtCS::GetCrosSec:CalcNew P="<<pMom<<",f="<<fCS<<",lastI="<<lastI<<G4endl; |
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| 147 | #endif |
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| 148 | //!!The slave functions must provide cross-sections in millibarns (mb) !! (not in IU) |
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| 149 | lastCS=CalculateCrossSection(fCS,0,j,2212,lastZ,lastN,pMom); //calculate & create |
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| 150 | if(lastCS<=0.) |
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| 151 | { |
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| 152 | lastTH = ThresholdEnergy(tgZ, tgN); // The Threshold Energy which is now the last |
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| 153 | #ifdef pdebug |
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| 154 | G4cout<<"G4QNeutronNuclCSec::GetCrossSect: NewThresh="<<lastTH<<",T="<<pEn<<G4endl; |
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| 155 | #endif |
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| 156 | if(pEn>lastTH) |
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| 157 | { |
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| 158 | #ifdef pdebug |
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| 159 | G4cout<<"G4QNeutCS::GetCS: First T="<<pEn<<"(CS=0) > Threshold="<<lastTH<<G4endl; |
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| 160 | #endif |
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| 161 | lastTH=pEn; |
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| 162 | } |
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| 163 | } |
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| 164 | #ifdef pdebug |
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| 165 | G4cout<<"G4QNtCS::GetCrosSec: New CS="<<lastCS<<",lZ="<<lastN<<",lN="<<lastZ<<G4endl; |
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| 166 | #endif |
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| 167 | colN.push_back(tgN); |
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| 168 | colZ.push_back(tgZ); |
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| 169 | colP.push_back(pMom); |
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| 170 | colTH.push_back(lastTH); |
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| 171 | colCS.push_back(lastCS); |
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| 172 | #ifdef pdebug |
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| 173 | G4cout<<"G4QNtCS::GetCS:1st,P="<<pMom<<"(MeV),CS="<<lastCS*millibarn<<"(mb)"<<G4endl; |
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| 174 | #endif |
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| 175 | return lastCS*millibarn; |
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| 176 | } // End of creation of the new set of parameters |
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| 177 | else |
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| 178 | { |
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| 179 | #ifdef pdebug |
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| 180 | G4cout<<"G4QNeutronNuclearCrossSect::GetCS: Update lastI="<<lastI<<",j="<<j<<G4endl; |
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| 181 | #endif |
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| 182 | colP[lastI]=pMom; |
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| 183 | colCS[lastI]=lastCS; |
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| 184 | } |
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| 185 | } // End of parameters udate |
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| 186 | else if(pEn<=lastTH) |
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| 187 | { |
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| 188 | #ifdef pdebug |
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| 189 | G4cout<<"G4QNeutCS::GetCS: Current T="<<pEn<<" < Threshold="<<lastTH<<", CS=0"<<G4endl; |
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| 190 | #endif |
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| 191 | return 0.; // Momentum is below the Threshold Value -> CS=0 |
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| 192 | } |
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| 193 | // else if(std::fabs(lastP/pMom-1.)<tolerance) |
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| 194 | else if(lastP==pMom) // do not use tolerance |
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| 195 | { |
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| 196 | #ifdef pdebug |
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| 197 | G4cout<<"G4QNtCS::GetCS:OldCur P="<<pMom<<"="<<pMom<<", CS="<<lastCS*millibarn<<G4endl; |
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| 198 | #endif |
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| 199 | return lastCS*millibarn; // Use theLastCS |
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| 200 | } |
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| 201 | else |
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| 202 | { |
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| 203 | #ifdef pdebug |
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| 204 | G4cout<<"G4QNtCS::GetCS:UpdatCur P="<<pMom<<",f="<<fCS<<",I="<<lastI<<",j="<<j<<G4endl; |
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| 205 | #endif |
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| 206 | lastCS=CalculateCrossSection(fCS,1,j,2212,lastZ,lastN,pMom); // Only UpdateDB |
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| 207 | lastP=pMom; |
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| 208 | } |
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| 209 | #ifdef pdebug |
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| 210 | G4cout<<"G4QNtCS::GetCroSec:End,P="<<pMom<<"(MeV),CS="<<lastCS*millibarn<<"(mb)"<<G4endl; |
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| 211 | #endif |
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| 212 | return lastCS*millibarn; |
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| 213 | } |
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| 214 | |
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| 215 | // The main member function giving the gamma-A cross section (E in GeV, CS in mb) |
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| 216 | G4double G4QNeutronNuclearCrossSection::CalculateCrossSection(G4bool, G4int F, G4int I, |
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| 217 | G4int, G4int targZ, G4int targN, G4double Momentum) |
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| 218 | { |
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| 219 | static const G4double THmin=27.; // minimum Momentum (MeV/c) Threshold |
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| 220 | static const G4double THmiG=THmin*.001; // minimum Momentum (GeV/c) Threshold |
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| 221 | static const G4double dP=10.; // step for the LEN (Low ENergy) table MeV/c |
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| 222 | static const G4double dPG=dP*.001; // step for the LEN (Low ENergy) table GeV/c |
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| 223 | static const G4int nL=105; // A#of LEN points in E (step 10 MeV/c) |
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| 224 | static const G4double Pmin=THmin+(nL-1)*dP; // minP for the HighE part with safety |
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| 225 | static const G4double Pmax=227000.; // maxP for the HEN (High ENergy) part 227 GeV |
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| 226 | static const G4int nH=224; // A#of HEN points in lnE |
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| 227 | static const G4double milP=std::log(Pmin);// Low logarithm energy for the HEN part |
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| 228 | static const G4double malP=std::log(Pmax);// High logarithm energy (each 2.75 percent) |
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| 229 | static const G4double dlP=(malP-milP)/(nH-1); // Step in log energy in the HEN part |
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| 230 | static const G4double milPG=std::log(.001*Pmin);// Low logarithm energy for the HEN part GeV/c |
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| 231 | // |
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| 232 | // Associative memory for acceleration |
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| 233 | //static std::vector <G4double> spA; // shadowing coefficients (A-dependent) |
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| 234 | static std::vector <G4double*> LEN; // Vector of pointers to LowEnProtonCrossSection |
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| 235 | static std::vector <G4double*> HEN; // Vector of pointers to HighEnProtonCrossSection |
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| 236 | #ifdef debug |
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| 237 | G4cout<<"G4QNeutronNuclearCS::CalcCS: N="<<targN<<",Z="<<targZ<<",P="<<Momentum<<G4endl; |
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| 238 | #endif |
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| 239 | if (Momentum<THmin) return 0.; // @@ This can be dangerouse for the heaviest nuc.! |
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| 240 | G4double sigma=0.; |
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| 241 | if(F&&I) sigma=0.; // @@ *!* Fake line *!* to use F & I !!!Temporary!!! |
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| 242 | G4double A=targN+targZ; // A of the target |
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| 243 | if(F<=0) // This isotope was not the last used isotop |
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| 244 | { |
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| 245 | if(F<0) // This isotope was found in DAMDB =========> RETRIEVE |
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| 246 | { |
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| 247 | lastLEN=LEN[I]; // Pointer to prepared LowEnergy cross sections |
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| 248 | lastHEN=HEN[I]; // Pointer to prepared High Energy cross sections |
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| 249 | } |
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| 250 | else // This isotope wasn't calculated previously => CREATE |
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| 251 | { |
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| 252 | lastLEN = new G4double[nL]; // Allocate memory for the new LEN cross sections |
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| 253 | lastHEN = new G4double[nH]; // Allocate memory for the new HEN cross sections |
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| 254 | // --- Instead of making a separate function --- |
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| 255 | G4double P=THmiG; // Table threshold in GeV/c |
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| 256 | for(G4int m=0; m<nL; m++) |
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| 257 | { |
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| 258 | lastLEN[m] = CrossSectionLin(targZ, targN, P); |
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| 259 | P+=dPG; |
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| 260 | } |
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| 261 | G4double lP=milPG; |
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| 262 | for(G4int n=0; n<nH; n++) |
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| 263 | { |
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| 264 | lastHEN[n] = CrossSectionLog(targZ, targN, lP); |
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| 265 | lP+=dlP; |
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| 266 | } |
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| 267 | // --- End of possible separate function |
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| 268 | // *** The synchronization check *** |
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| 269 | G4int sync=LEN.size(); |
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| 270 | if(sync!=I) G4cerr<<"***G4QNeutronNuclCS::CalcCrossSect:Sync="<<sync<<"#"<<I<<G4endl; |
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| 271 | LEN.push_back(lastLEN); // added LEN, found by AH 10/7/02 |
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| 272 | HEN.push_back(lastHEN); // added HEN, found by AH 10/7/02 |
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| 273 | } // End of creation of the new set of parameters |
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| 274 | } // End of parameters udate |
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| 275 | // ============================== NOW the Magic Formula ================================= |
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| 276 | if (Momentum<lastTH) return 0.; // It must be already checked in the interface class |
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| 277 | else if (Momentum<Pmin) // High Energy region |
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| 278 | { |
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| 279 | #ifdef debug |
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| 280 | G4cout<<"G4QNeutCS::CalcCS:bLEN A="<<A<<", nL="<<nL<<",TH="<<THmin<<",dP="<<dP<<G4endl; |
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| 281 | #endif |
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| 282 | if(A<=1.) sigma=0.; |
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| 283 | else sigma=EquLinearFit(Momentum,nL,THmin,dP,lastLEN); |
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| 284 | #ifdef debugn |
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| 285 | if(sigma<0.) |
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| 286 | G4cout<<"G4QNeutCS::CalcCS:A="<<A<<",E="<<Momentum<<",T="<<THmin<<",dP="<<dP<<G4endl; |
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| 287 | #endif |
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| 288 | } |
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| 289 | else if (Momentum<Pmax) // High Energy region |
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| 290 | { |
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| 291 | G4double lP=std::log(Momentum); |
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| 292 | #ifdef debug |
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| 293 | G4cout<<"G4QNeutNucCS::CalcCS: before HEN nH="<<nH<<",iE="<<milP<<",dlP="<<dlP<<G4endl; |
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| 294 | #endif |
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| 295 | sigma=EquLinearFit(lP,nH,milP,dlP,lastHEN); |
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| 296 | } |
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| 297 | else // UHE region (calculation, not frequent) |
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| 298 | { |
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| 299 | G4double P=0.001*Momentum; // Approximation formula is for P in GeV/c |
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| 300 | sigma=CrossSectionFormula(targZ, targN, P, std::log(P)); |
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| 301 | } |
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| 302 | #ifdef debug |
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| 303 | G4cout<<"G4QNeutronNuclearCrossSection::CalcCS: sigma="<<sigma<<G4endl; |
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| 304 | #endif |
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| 305 | if(sigma<0.) return 0.; |
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| 306 | return sigma; |
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| 307 | } |
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| 308 | |
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| 309 | // Electromagnetic momentum-threshold (in MeV/c) |
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| 310 | G4double G4QNeutronNuclearCrossSection::ThresholdMomentum(G4int tZ, G4int tN) |
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| 311 | { |
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| 312 | static const G4double third=1./3.; |
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| 313 | static const G4double pM = G4QPDGCode(2212).GetMass(); // Proton mass in MeV |
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| 314 | static const G4double tpM= pM+pM; // Doubled proton mass (MeV) |
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| 315 | G4double tA=tZ+tN; |
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| 316 | if(tZ<.99 || tN<0.) return 0.; |
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| 317 | //G4double dE=1.263*tZ/(1.+std::pow(tA,third)); |
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| 318 | G4double dE=tZ/(1.+std::pow(tA,third)); // Safety for diffused edge of the nucleus (QE) |
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| 319 | return std::sqrt(dE*(tpM+dE)); |
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| 320 | } |
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| 321 | |
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| 322 | // Calculation formula for proton-nuclear inelastic cross-section (mb) (P in GeV/c) |
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| 323 | G4double G4QNeutronNuclearCrossSection::CrossSectionLin(G4int tZ, G4int tN, G4double P) |
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| 324 | { |
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| 325 | G4double sigma=0.; |
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| 326 | if(P<ThresholdMomentum(tZ,tN)*.001) return sigma; |
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| 327 | G4double lP=std::log(P); |
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| 328 | if(tZ==1&&!tN){if(P>.35) sigma=CrossSectionFormula(tZ,tN,P,lP);}// s(pp)=0 below 350Mev/c |
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| 329 | else if(tZ<93 && tN<239) // General solution |
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| 330 | { |
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| 331 | G4double pex=0.; |
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| 332 | G4double pos=0.; |
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| 333 | G4double wid=1.; |
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| 334 | if(tZ==13 && tN==14) // Excited metastable states |
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| 335 | { |
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| 336 | pex=230.; |
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| 337 | pos=.13; |
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| 338 | wid=8.e-5; |
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| 339 | } |
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| 340 | else if(tZ<7) |
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| 341 | { |
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| 342 | if(tZ==6 && tN==6) |
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| 343 | { |
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| 344 | pex=320.; |
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| 345 | pos=.14; |
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| 346 | wid=7.e-6; |
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| 347 | } |
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| 348 | else if(tZ==4 && tN==5) |
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| 349 | { |
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| 350 | pex=600.; |
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| 351 | pos=.132; |
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| 352 | wid=.005; |
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| 353 | } |
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| 354 | else if(tZ==3 && tN==4) |
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| 355 | { |
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| 356 | pex=280.; |
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| 357 | pos=.19; |
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| 358 | wid=.0025; |
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| 359 | } |
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| 360 | else if(tZ==3 && tN==3) |
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| 361 | { |
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| 362 | pex=370.; |
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| 363 | pos=.171; |
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| 364 | wid=.006; |
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| 365 | } |
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| 366 | else if(tZ==2 && tN==1) |
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| 367 | { |
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| 368 | pex=30.; |
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| 369 | pos=.22; |
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| 370 | wid=.0005; |
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| 371 | } |
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| 372 | } |
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| 373 | sigma=CrossSectionFormula(tZ,tN,P,lP); |
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| 374 | if(pex>0.) |
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| 375 | { |
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| 376 | G4double dp=P-pos; |
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| 377 | sigma+=pex*std::exp(dp*dp/wid); |
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| 378 | } |
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| 379 | } |
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| 380 | else |
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| 381 | { |
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| 382 | G4cerr<<"-Warning-G4QNeutronNuclearCrosSect::CSLin:*Bad A* Z="<<tZ<<", N="<<tN<<G4endl; |
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| 383 | sigma=0.; |
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| 384 | } |
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| 385 | if(sigma<0.) return 0.; |
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| 386 | return sigma; |
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| 387 | } |
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| 388 | |
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| 389 | // Calculation formula for proton-nuclear inelastic cross-section (mb) log(P in GeV/c) |
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| 390 | G4double G4QNeutronNuclearCrossSection::CrossSectionLog(G4int tZ, G4int tN, G4double lP) |
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| 391 | { |
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| 392 | G4double P=std::exp(lP); |
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| 393 | return CrossSectionFormula(tZ, tN, P, lP); |
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| 394 | } |
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| 395 | // Calculation formula for proton-nuclear inelastic cross-section (mb) log(P in GeV/c) |
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| 396 | G4double G4QNeutronNuclearCrossSection::CrossSectionFormula(G4int tZ, G4int tN, |
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| 397 | G4double P, G4double lP) |
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| 398 | { |
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| 399 | G4double sigma=0.; |
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| 400 | if(tZ==1 && !tN) // np=pp interaction |
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| 401 | { |
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| 402 | G4double sp=std::sqrt(P); |
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| 403 | G4double ds=lP-4.2; |
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| 404 | G4double dp=P-.35; |
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| 405 | G4double d3=dp*dp*dp; |
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| 406 | sigma=(33.+.2*ds*ds)/(1.+.4/sp)/(1.+.5/d3/d3); |
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| 407 | } |
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| 408 | else if(tZ<93 && tN<146) // General solution |
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| 409 | { |
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| 410 | G4double lP=std::log(P); |
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| 411 | G4double d=lP-4.2; |
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| 412 | G4double p2=P*P; |
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| 413 | G4double p4=p2*p2; |
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| 414 | G4double a=tN+tZ; // A of the target |
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| 415 | G4double al=std::log(a); |
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| 416 | G4double a2=a*a; |
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| 417 | G4double a4=a2*a2; |
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| 418 | G4double a8=a4*a4; |
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| 419 | G4double a12=a8*a4; |
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| 420 | G4double a16=a8*a8; |
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| 421 | G4double c=170./(1.+5./std::exp(al*1.6)); |
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| 422 | G4double dl=al-2.8; |
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| 423 | G4double r=.3+.2*dl*dl; |
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| 424 | G4double g=40.*std::exp(al*0.712)/(1.+12.2/a)/(1.+34./a2); |
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| 425 | G4double e=318.+a4/(1.+.0015*a4/std::exp(al*0.09))/(1.+4.e-28*a12)+ |
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| 426 | 8.e-18/(1./a16+1.3e-20)/(1.+1.e-21*a12); |
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| 427 | G4double s=3.57+.009*a2/(1.+.0001*a2*a); |
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| 428 | G4double h=(.01/a4+2.5e-6/a)*(1.+7.e-8*a4)/(1.+6.e7/a12/a2); |
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| 429 | sigma=(c+d*d)/(1.+r/p4)+(g+e*std::exp(-s*P))/(1.+h/p4/p4); |
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| 430 | } |
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| 431 | else |
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| 432 | { |
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| 433 | G4cerr<<"-Warning-G4QNeutronNuclearCroSect::CSForm:*Bad A* Z="<<tZ<<", N="<<tN<<G4endl; |
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| 434 | sigma=0.; |
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| 435 | } |
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| 436 | if(sigma<0.) return 0.; |
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| 437 | return sigma; |
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| 438 | } |
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