[819] | 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 | // |
---|
[1340] | 26 | // $Id: G4GNASHTransitions.cc,v 1.6 2010/08/20 07:42:19 vnivanch Exp $ |
---|
| 27 | // GEANT4 tag $Name: geant4-09-03-ref-09 $ |
---|
| 28 | // |
---|
| 29 | // 20.08.2010 V.Ivanchenko move constructor and destructor to the source |
---|
| 30 | |
---|
[819] | 31 | #include "G4GNASHTransitions.hh" |
---|
| 32 | #include "G4PreCompoundParameters.hh" |
---|
| 33 | #include "G4HadronicException.hh" |
---|
| 34 | |
---|
[1340] | 35 | G4GNASHTransitions::G4GNASHTransitions() |
---|
| 36 | {} |
---|
[819] | 37 | |
---|
[1340] | 38 | G4GNASHTransitions::~G4GNASHTransitions() |
---|
| 39 | {} |
---|
[819] | 40 | |
---|
| 41 | G4double G4GNASHTransitions:: |
---|
| 42 | CalculateProbability(const G4Fragment & aFragment) |
---|
| 43 | { |
---|
| 44 | const G4double k = 135.0 * MeV*MeV*MeV; |
---|
| 45 | G4double E = aFragment.GetExcitationEnergy(); |
---|
| 46 | G4double P = aFragment.GetNumberOfParticles(); |
---|
| 47 | G4double H = aFragment.GetNumberOfHoles(); |
---|
| 48 | G4double N = P + H; |
---|
| 49 | G4double A = aFragment.GetA(); |
---|
| 50 | |
---|
| 51 | G4double theMatrixElement(k*N/(A*A*A*E)); |
---|
| 52 | G4double x = E/N; |
---|
| 53 | if ( x < 2.0*MeV ) theMatrixElement *= x/std::sqrt(14.0*MeV*MeV); |
---|
| 54 | else if ( x < 7.0*MeV ) x *= std::sqrt(x/7.0*MeV); |
---|
| 55 | else if ( x < 15.0*MeV ) ; |
---|
| 56 | else x *= std::sqrt(15.0*MeV/x); |
---|
| 57 | |
---|
| 58 | // g = (6.0/pi2)*a*A |
---|
| 59 | G4double g = (6.0/pi2)*G4PreCompoundParameters::GetAddress()->GetLevelDensity()*A; |
---|
| 60 | |
---|
| 61 | G4double Epauli = ((P+1.0)*(P+1.0) + (H+1.0)*(H+1.0) + (P+1.0) - 3.0*(H-1.0))/4.0; |
---|
| 62 | |
---|
| 63 | G4double Probability = g*g*g *(E-Epauli)*(E-Epauli); |
---|
| 64 | Probability /= 2.0*(N+1.0)*h_Planck; |
---|
| 65 | Probability *= theMatrixElement; |
---|
| 66 | |
---|
| 67 | return Probability; |
---|
| 68 | } |
---|
| 69 | |
---|
[1340] | 70 | void G4GNASHTransitions::PerformTransition(G4Fragment & result) |
---|
[819] | 71 | { |
---|
| 72 | result.SetNumberOfParticles(result.GetNumberOfParticles()+1); |
---|
| 73 | result.SetNumberOfHoles(result.GetNumberOfHoles()+1); |
---|
| 74 | if (G4UniformRand() <= result.GetZ()/result.GetA()) |
---|
| 75 | { |
---|
| 76 | result.SetNumberOfCharged(result.GetNumberOfCharged()+1); |
---|
| 77 | } |
---|
| 78 | |
---|
| 79 | if (result.GetNumberOfParticles() < result.GetNumberOfCharged()) |
---|
| 80 | { |
---|
| 81 | result.SetNumberOfCharged(result.GetNumberOfParticles()); |
---|
| 82 | } |
---|
| 83 | } |
---|