| Geant4 Cross Reference |
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 // INCL++ intra-nuclear cascade model
27 // Alain Boudard, CEA-Saclay, France
28 // Joseph Cugnon, University of Liege, Belgium
29 // Jean-Christophe David, CEA-Saclay, France
30 // Pekka Kaitaniemi, CEA-Saclay, France, and Helsinki Institute of Physics, Finland
31 // Sylvie Leray, CEA-Saclay, France
32 // Davide Mancusi, CEA-Saclay, France
33 //
34 #define INCLXX_IN_GEANT4_MODE 1
35
36 #include "globals.hh"
37
38 /** \file G4INCLNuclearPotentialEnergyIsospinSmooth.cc
39 * \brief Isospin- and energy-dependent nuclear potential.
40 *
41 * Provides an isospin- and energy-dependent nuclear potential. The cusp at 200
42 * MeV is replaced by a smooth exponential.
43 *
44 * \date 16 February 2011
45 * \author Davide Mancusi
46 */
47
48 #include "G4INCLNuclearPotentialEnergyIsospinSmooth.hh"
49 #include "G4INCLParticleTable.hh"
50 #include "G4INCLGlobals.hh"
51
52 namespace G4INCL {
53
54 namespace NuclearPotential {
55
56 const G4double NuclearPotentialEnergyIsospinSmooth::alpha= 0.223;
57 const G4double NuclearPotentialEnergyIsospinSmooth::deltaE= 25.;
58
59 // Constructors
60 NuclearPotentialEnergyIsospinSmooth::NuclearPotentialEnergyIsospinSmooth(const G4int A, const G4int Z, const G4bool aPionPotential)
61 : NuclearPotentialIsospin(A,Z,aPionPotential)
62 {}
63
64 // Destructor
65 NuclearPotentialEnergyIsospinSmooth::~NuclearPotentialEnergyIsospinSmooth() {}
66
67 G4double NuclearPotentialEnergyIsospinSmooth::computePotentialEnergy(const Particle *particle) const {
68
69 const G4double v0 = NuclearPotentialIsospin::computePotentialEnergy(particle);
70
71 if(particle->isNucleon()) {
72 const G4double t = particle->getKineticEnergy();
73 const G4double tf = getFermiEnergy(particle);
74 // Constant potential for T<Tf
75 if(t < tf)
76 return v0;
77
78 // Linear function for Tf<T<T0, exponential function for T>T0
79 const G4double t0 = tf + v0*(1.-alpha)/alpha - deltaE; // deltaE before the linear potential vanishes
80 G4double v;
81 if(t<t0) {
82 v = v0 - alpha*(t-tf)/(1.-alpha);
83 } else {
84 const G4double v_at_t0 = v0 - alpha*(t0-tf)/(1.-alpha);
85 const G4double kappa = alpha / (v_at_t0 * (1.-alpha));
86 v = v_at_t0 * std::exp(kappa * (t0-t));
87 }
88 return (v>0.0) ? v : 0.0;
89 } else
90 return v0;
91 }
92
93 }
94 }
95
96