[819] | 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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[962] | 26 | // |
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| 27 | // $Id: G4PreCompoundNucleon.cc,v 1.13 2009/02/11 18:06:00 vnivanch Exp $ |
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| 28 | // GEANT4 tag $Name: geant4-09-02-ref-02 $ |
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| 29 | // |
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| 30 | // ------------------------------------------------------------------- |
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| 31 | // |
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| 32 | // GEANT4 Class file |
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| 33 | // |
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| 34 | // |
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| 35 | // File name: G4PreCompoundNucleon |
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| 36 | // |
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| 37 | // Author: V.Lara |
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| 38 | // |
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| 39 | // Modified: |
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| 40 | // 10.02.2009 J. M. Quesada cleanup |
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| 41 | // |
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[819] | 42 | |
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| 43 | #include "G4PreCompoundNucleon.hh" |
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| 44 | #include "G4PreCompoundParameters.hh" |
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| 45 | |
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[962] | 46 | G4bool G4PreCompoundNucleon::IsItPossible(const G4Fragment& aFragment) |
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| 47 | { |
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| 48 | G4int pplus = aFragment.GetNumberOfCharged(); |
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| 49 | G4int pneut = aFragment.GetNumberOfParticles()-pplus; |
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| 50 | return (pneut >= (GetA()-GetZ()) && pplus >= GetZ()); |
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| 51 | } |
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[819] | 52 | |
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| 53 | G4double G4PreCompoundNucleon:: |
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| 54 | ProbabilityDistributionFunction(const G4double eKin, |
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| 55 | const G4Fragment& aFragment) |
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| 56 | { |
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| 57 | if ( !IsItPossible(aFragment) ) return 0.0; |
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| 58 | |
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| 59 | G4double U = aFragment.GetExcitationEnergy(); |
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| 60 | G4double P = aFragment.GetNumberOfParticles(); |
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| 61 | G4double H = aFragment.GetNumberOfHoles(); |
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| 62 | G4double N = P + H; |
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| 63 | |
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| 64 | G4double g0 = (6.0/pi2)*aFragment.GetA() * |
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| 65 | G4PreCompoundParameters::GetAddress()->GetLevelDensity(); |
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[962] | 66 | |
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[819] | 67 | G4double g1 = (6.0/pi2)*GetRestA() * |
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| 68 | G4PreCompoundParameters::GetAddress()->GetLevelDensity(); |
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| 69 | |
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| 70 | G4double A0 = ((P*P+H*H+P-H)/4.0 - H/2.0)/g0; |
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[962] | 71 | |
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| 72 | G4double A1 = (A0 - P/2.0)/g1; |
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[819] | 73 | |
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| 74 | G4double E0 = std::max(0.0,U - A0); |
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| 75 | if (E0 == 0.0) return 0.0; |
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| 76 | G4double E1 = std::max(0.0,U - eKin - GetBindingEnergy() - A1); |
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| 77 | if (E1 == 0.0) return 0.0; |
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| 78 | |
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| 79 | |
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[962] | 80 | G4double Probability = 1.0/pi2*2.0/(hbarc*hbarc*hbarc) * GetReducedMass() |
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| 81 | * GetRj(aFragment.GetNumberOfParticles(), aFragment.GetNumberOfCharged()) |
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| 82 | * eKin*CrossSection(eKin)*millibarn * P*(N-1.0) * std::pow(g1*E1/(g0*E0),N-2.0)/E0 * g1/(g0*g0); |
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[819] | 83 | |
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[962] | 84 | if (GetRj(aFragment.GetNumberOfParticles(), aFragment.GetNumberOfCharged())<0.0 |
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| 85 | || CrossSection(eKin) <0) { |
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| 86 | std::ostringstream errOs; |
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| 87 | G4cout<<"WARNING: NEGATIVE VALUES "<<G4endl; |
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| 88 | errOs << "Rj=" << GetRj(aFragment.GetNumberOfParticles(), aFragment.GetNumberOfCharged()) |
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| 89 | <<G4endl; |
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| 90 | errOs <<" xsec("<<eKin<<" MeV) ="<<CrossSection(eKin)<<G4endl; |
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| 91 | errOs <<" A="<<GetA()<<" Z="<<GetZ()<<G4endl; |
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| 92 | throw G4HadronicException(__FILE__, __LINE__, errOs.str()); |
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| 93 | } |
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| 94 | |
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[819] | 95 | return Probability; |
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| 96 | } |
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