| 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: G4NeutronHPWattSpectrum.hh,v 1.11 2006/06/29 20:49:39 gunter 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 G4NeutronHPWattSpectrum_h
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| 31 | #define G4NeutronHPWattSpectrum_h 1
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| 32 |
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| 33 | #include "globals.hh"
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| 34 | #include "G4NeutronHPVector.hh"
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| 35 | #include "Randomize.hh"
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| 36 | #include "G4ios.hh"
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| 37 | #include <fstream>
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| 38 | #include "G4VNeutronHPEDis.hh"
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| 39 |
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| 40 | // we will need a List of these .... one per term.
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| 41 |
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| 42 | class G4NeutronHPWattSpectrum : public G4VNeutronHPEDis
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| 43 | {
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| 44 | public:
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| 45 | G4NeutronHPWattSpectrum()
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| 46 | {
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| 47 | expm1 = std::exp(-1.);
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| 48 | }
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| 49 | ~G4NeutronHPWattSpectrum()
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| 50 | {
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| 51 | }
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| 52 |
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| 53 | inline void Init(std::ifstream & aDataFile)
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| 54 | {
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| 55 | theFractionalProb.Init(aDataFile, eV);
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| 56 | theApar.Init(aDataFile, eV);
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| 57 | theBpar.Init(aDataFile, eV);
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| 58 | }
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| 59 |
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| 60 | inline G4double GetFractionalProbability(G4double anEnergy)
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| 61 | {
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| 62 | return theFractionalProb.GetY(anEnergy);
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| 63 | }
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| 64 |
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| 65 | G4double Sample(G4double anEnergy);
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| 66 |
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| 67 | private:
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| 68 |
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| 69 | inline G4double Watt(G4double anEnergy, G4double a, G4double b)
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| 70 | {
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| 71 | G4double energy = anEnergy/eV;
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| 72 | G4double result = std::exp(-energy/a)*std::sinh(std::sqrt(b*energy));
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| 73 | return result;
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| 74 | }
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| 75 |
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| 76 | private:
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| 77 |
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| 78 | G4double expm1;
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| 79 |
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| 80 | G4NeutronHPVector theFractionalProb;
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| 81 |
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| 82 | G4NeutronHPVector theApar;
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| 83 | G4NeutronHPVector theBpar;
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| 84 |
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| 85 | };
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| 86 |
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| 87 | #endif
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