| 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: G4NeutronHPNBodyPhaseSpace.hh,v 1.12 2006/06/29 20:48:43 gunter Exp $ |
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| 28 | // GEANT4 tag $Name: geant4-09-02-ref-02 $ |
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| 29 | // |
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| 30 | #ifndef G4NeutronHPNBodyPhaseSpace_h |
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| 31 | #define G4NeutronHPNBodyPhaseSpace_h 1 |
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| 32 | |
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| 33 | #include "G4ios.hh" |
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| 34 | #include <fstream> |
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| 35 | #include "globals.hh" |
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| 36 | #include "G4Neutron.hh" |
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| 37 | #include "G4VNeutronHPEnergyAngular.hh" |
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| 38 | #include "G4ReactionProduct.hh" |
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| 39 | |
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| 40 | class G4NeutronHPNBodyPhaseSpace : public G4VNeutronHPEnergyAngular |
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| 41 | { |
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| 42 | public: |
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| 43 | |
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| 44 | G4NeutronHPNBodyPhaseSpace(){} |
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| 45 | ~G4NeutronHPNBodyPhaseSpace(){} |
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| 46 | |
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| 47 | public: |
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| 48 | |
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| 49 | void Init(G4double aMass, G4int aCount) |
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| 50 | { |
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| 51 | theTotalMass=aMass; |
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| 52 | theTotalCount=aCount; |
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| 53 | } |
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| 54 | |
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| 55 | void Init(std::ifstream & aDataFile) |
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| 56 | { |
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| 57 | aDataFile >> theTotalMass >> theTotalCount; |
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| 58 | theTotalMass *= G4Neutron::Neutron()->GetPDGMass(); |
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| 59 | } |
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| 60 | |
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| 61 | G4ReactionProduct * Sample(G4double anEnergy, G4double massCode, G4double mass); |
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| 62 | |
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| 63 | private: |
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| 64 | |
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| 65 | inline G4double Prob(G4double anEnergy, G4double eMax, G4int n) |
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| 66 | { |
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| 67 | G4double result; |
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| 68 | result = std::sqrt(anEnergy)*std::pow(eMax-anEnergy, 3.*n/2.-4.); |
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| 69 | return result; |
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| 70 | } |
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| 71 | |
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| 72 | inline G4double C(G4double anEnergy, G4double mass) |
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| 73 | { |
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| 74 | G4double result(0); |
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| 75 | if(theTotalCount==3) result = 4./pi/std::pow(GetEmax(anEnergy, mass),2); |
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| 76 | if(theTotalCount==4) result = 105./32./std::pow(GetEmax(anEnergy, mass), 3.5); |
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| 77 | if(theTotalCount==5) result = 256./14./pi/std::pow(GetEmax(anEnergy, mass), 5.); |
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| 78 | return result; |
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| 79 | } |
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| 80 | |
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| 81 | inline G4double GetEmax(G4double anEnergy, G4double mass) |
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| 82 | { |
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| 83 | G4double result; |
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| 84 | G4double tMass = GetTarget()->GetMass(); |
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| 85 | G4double pMass = GetNeutron()->GetMass(); |
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| 86 | G4double availableEnergy = GetQValue() + anEnergy*tMass/(pMass+tMass); |
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| 87 | result = availableEnergy*(theTotalMass-mass)/theTotalMass; |
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| 88 | return result; |
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| 89 | } |
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| 90 | |
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| 91 | G4double MeanEnergyOfThisInteraction() {return -1; } |
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| 92 | |
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| 93 | private: |
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| 94 | |
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| 95 | G4double theTotalMass; |
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| 96 | G4int theTotalCount; |
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| 97 | |
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| 98 | }; |
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| 99 | #endif |
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