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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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18 | // * This code implementation is the result of the scientific and * |
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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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