| 1 | // |
|---|
| 2 | // ******************************************************************** |
|---|
| 3 | // * License and Disclaimer * |
|---|
| 4 | // * * |
|---|
| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
|---|
| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
|---|
| 7 | // * conditions of the Geant4 Software License, included in the file * |
|---|
| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
|---|
| 9 | // * include a list of copyright holders. * |
|---|
| 10 | // * * |
|---|
| 11 | // * Neither the authors of this software system, nor their employing * |
|---|
| 12 | // * institutes,nor the agencies providing financial support for this * |
|---|
| 13 | // * work make any representation or warranty, express or implied, * |
|---|
| 14 | // * regarding this software system or assume any liability for its * |
|---|
| 15 | // * use. Please see the license in the file LICENSE and URL above * |
|---|
| 16 | // * for the full disclaimer and the limitation of liability. * |
|---|
| 17 | // * * |
|---|
| 18 | // * This code implementation is the result of the scientific and * |
|---|
| 19 | // * technical work of the GEANT4 collaboration. * |
|---|
| 20 | // * By using, copying, modifying or distributing the software (or * |
|---|
| 21 | // * any work based on the software) you agree to acknowledge its * |
|---|
| 22 | // * use in resulting scientific publications, and indicate your * |
|---|
| 23 | // * acceptance of all terms of the Geant4 Software license. * |
|---|
| 24 | // ******************************************************************** |
|---|
| 25 | // |
|---|
| 26 | #include "G4HETCNeutron.hh" |
|---|
| 27 | |
|---|
| 28 | G4double G4HETCNeutron::K(const G4Fragment & aFragment) |
|---|
| 29 | { |
|---|
| 30 | if (GetStage() != 1) return 1.0; |
|---|
| 31 | // Number of protons in projectile |
|---|
| 32 | G4double Pa = static_cast<G4int>(aFragment.GetParticleDefinition()->GetPDGCharge()); |
|---|
| 33 | // Number of neutrons in projectile |
|---|
| 34 | G4double Na = aFragment.GetParticleDefinition()->GetBaryonNumber(); |
|---|
| 35 | G4double TargetA = aFragment.GetA() - Na; |
|---|
| 36 | G4double TargetZ = aFragment.GetZ() - Pa; |
|---|
| 37 | Na -= Pa; |
|---|
| 38 | G4double r = TargetZ/TargetA; |
|---|
| 39 | |
|---|
| 40 | G4double P = aFragment.GetNumberOfParticles(); |
|---|
| 41 | G4double H = aFragment.GetNumberOfHoles(); |
|---|
| 42 | |
|---|
| 43 | G4double result = 0.0; |
|---|
| 44 | if (P > 0) |
|---|
| 45 | { |
|---|
| 46 | result = (H*(1.0-r)+Na)/P; |
|---|
| 47 | |
|---|
| 48 | result /= (TargetA-TargetZ)/TargetA; |
|---|
| 49 | } |
|---|
| 50 | |
|---|
| 51 | return std::max(0.0,result); |
|---|
| 52 | } |
|---|
| 53 | |
|---|
| 54 | |
|---|
| 55 | G4double G4HETCNeutron::GetKineticEnergy(const G4Fragment & aFragment) |
|---|
| 56 | { |
|---|
| 57 | G4double H = aFragment.GetNumberOfHoles(); |
|---|
| 58 | G4double Pb = aFragment.GetNumberOfParticles() - GetA(); |
|---|
| 59 | G4double Nb = Pb + H; |
|---|
| 60 | |
|---|
| 61 | G4double Ab = std::max(0.0,(Pb*Pb+H*H+Pb-3*H)/4.0); |
|---|
| 62 | G4double Emax = GetMaximalKineticEnergy() - Ab; |
|---|
| 63 | |
|---|
| 64 | G4double cut = GetBeta() / (GetBeta()+Emax/(Nb+1)); |
|---|
| 65 | G4double x(0.0); |
|---|
| 66 | if (G4UniformRand() <= cut) |
|---|
| 67 | { |
|---|
| 68 | x = BetaRand(static_cast<G4int>(Nb),1); |
|---|
| 69 | } |
|---|
| 70 | else |
|---|
| 71 | { |
|---|
| 72 | x = BetaRand(static_cast<G4int>(Nb),2); |
|---|
| 73 | } |
|---|
| 74 | |
|---|
| 75 | return Emax * (1.0 - x); |
|---|
| 76 | } |
|---|
