| 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 | // $Id: G4NeutronHPAngularP.hh,v 1.11 2007/06/06 12:45:13 ahoward Exp $
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| 28 | // GEANT4 tag $Name: geant4-09-03-cand-01 $
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| 29 | //
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| 30 | #ifndef G4NeutronHPAngularP_h
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| 31 | #define G4NeutronHPAngularP_h 1
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| 32 |
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| 33 | #include "globals.hh"
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| 34 | #include "G4InterpolationManager.hh"
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| 35 |
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| 36 | class G4NeutronHPAngularP
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| 37 | {
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| 38 | public:
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| 39 |
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| 40 | G4NeutronHPAngularP()
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| 41 | {
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| 42 | theCosTh = 0;
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| 43 | theProb = 0;
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| 44 | }
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| 45 | ~G4NeutronHPAngularP()
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| 46 | {
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| 47 | if(theCosTh!=0) delete [] theCosTh;
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| 48 | if(theProb!=0) delete [] theProb;
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| 49 | }
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| 50 |
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| 51 | inline void Init(std::ifstream & aDataFile)
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| 52 | {
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| 53 | G4double eNeu, cosTheta, probDist;
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| 54 | G4int nProb;
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| 55 | aDataFile >> eNeu >> nProb;
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| 56 | theManager.Init(aDataFile);
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| 57 | eNeu *= eV;
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| 58 | Init(eNeu, nProb);
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| 59 | for (G4int iii=0; iii<nProb; iii++)
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| 60 | {
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| 61 | aDataFile >> cosTheta >> probDist;
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| 62 | SetCosTh(iii, cosTheta);
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| 63 | SetProb(iii,probDist);
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| 64 | }
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| 65 | }
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| 66 |
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| 67 | inline void Init(G4double e, G4int n)
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| 68 | {
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| 69 | theCosTh = new G4double[n];
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| 70 | theProb = new G4double[n];
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| 71 | theEnergy = e;
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| 72 | nCoeff = n;
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| 73 | }
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| 74 |
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| 75 | inline void SetEnergy(G4double energy){ theEnergy = energy; }
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| 76 | inline void SetCosTh(G4int l, G4double coeff) {theCosTh[l]=coeff;}
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| 77 | inline void SetProb(G4int l, G4double coeff) {theProb[l]=coeff;}
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| 78 |
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| 79 | inline G4double GetCosTh(G4int l) {return theCosTh[l];}
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| 80 | inline G4double GetProb(G4int l) {return theProb[l];}
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| 81 | inline G4double GetEnergy(){return theEnergy;}
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| 82 | inline G4int GetNumberOfPoints(){ return nCoeff; }
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| 83 | inline G4double GetCosTh()
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| 84 | {
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| 85 | G4int i;
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| 86 | G4double rand = G4UniformRand();
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| 87 | G4double run=0, runo=0;
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| 88 | for (i=0; i<GetNumberOfPoints(); i++)
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| 89 | {
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| 90 | runo=run;
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| 91 | run += GetProb(i);
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| 92 | if(run>rand) break;
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| 93 | }
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| 94 | if(i == GetNumberOfPoints()) i--;
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| 95 | G4double costh = theInt.Interpolate(theManager.GetScheme(i), rand,
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| 96 | runo, run, GetCosTh(i-1), GetCosTh(i));
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| 97 | return costh;
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| 98 | }
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| 99 |
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| 100 | private:
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| 101 |
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| 102 | G4double theEnergy; // neutron energy
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| 103 | G4NeutronHPInterpolator theInt; // knows tointerpolate
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| 104 | G4int nCoeff;
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| 105 | G4InterpolationManager theManager; // knows the interpolation between stores
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| 106 | G4double * theCosTh;
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| 107 | G4double * theProb; // probability distribution as fcn of theta
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| 108 | // integral normalised to 1.
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| 109 | };
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| 110 | #endif
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