| 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 | // by V. Lara |
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| 27 | |
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| 28 | #include "G4PreCompoundNucleon.hh" |
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| 29 | #include "G4PreCompoundParameters.hh" |
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| 30 | |
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| 31 | |
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| 32 | G4double G4PreCompoundNucleon:: |
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| 33 | ProbabilityDistributionFunction(const G4double eKin, |
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| 34 | const G4Fragment& aFragment) |
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| 35 | { |
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| 36 | if ( !IsItPossible(aFragment) ) return 0.0; |
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| 37 | |
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| 38 | const G4double r0 = G4PreCompoundParameters::GetAddress()->Getr0(); |
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| 39 | |
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| 40 | G4double U = aFragment.GetExcitationEnergy(); |
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| 41 | G4double P = aFragment.GetNumberOfParticles(); |
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| 42 | G4double H = aFragment.GetNumberOfHoles(); |
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| 43 | G4double N = P + H; |
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| 44 | |
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| 45 | // g = (6.0/pi2)*a*A |
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| 46 | // G4EvaporationLevelDensityParameter theLDP; |
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| 47 | G4double g0 = (6.0/pi2)*aFragment.GetA() * |
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| 48 | G4PreCompoundParameters::GetAddress()->GetLevelDensity(); |
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| 49 | // theLDP.LevelDensityParameter(static_cast<G4int>(aFragment.GetA()),static_cast<G4int>(aFragment.GetZ()),U); |
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| 50 | G4double g1 = (6.0/pi2)*GetRestA() * |
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| 51 | G4PreCompoundParameters::GetAddress()->GetLevelDensity(); |
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| 52 | // theLDP.LevelDensityParameter(static_cast<G4int>(GetRestA()),static_cast<G4int>(GetRestZ()),U); |
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| 53 | |
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| 54 | G4double A0 = ((P*P+H*H+P-H)/4.0 - H/2.0)/g0; |
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| 55 | G4double A1 = (A0*g0 - P/2.0)/g1; |
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| 56 | |
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| 57 | G4double E0 = std::max(0.0,U - A0); |
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| 58 | if (E0 == 0.0) return 0.0; |
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| 59 | G4double E1 = std::max(0.0,U - eKin - GetBindingEnergy() - A1); |
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| 60 | if (E1 == 0.0) return 0.0; |
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| 61 | |
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| 62 | |
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| 63 | G4double Probability = 2.0/(hbarc*hbarc*hbarc) * GetReducedMass() * |
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| 64 | GetRj(aFragment.GetNumberOfParticles(), aFragment.GetNumberOfCharged()) * r0 * r0 * std::pow(GetRestA(),2.0/3.0) * GetAlpha() * (eKin + GetBeta()) * |
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| 65 | P*(N-1.0) * std::pow(g1*E1/(g0*E0),N-2.0)/E0 * |
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| 66 | g1/(g0*g0); |
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| 67 | |
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| 68 | return Probability; |
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| 69 | } |
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