| 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 //
27 // -------------------------------------------------------------------
28 //
29 // GEANT4 Class file
30 //
31 //
32 // File name: G4PreCompoundNucleon
33 //
34 // Author: V.Lara
35 //
36 // Modified:
37 // 10.02.2009 J. M. Quesada cleanup
38 // 20.08.2010 V.Ivanchenko added G4Pow and G4PreCompoundParameters pointers
39 // use int Z and A and cleanup
40 //
41
42 #include "G4PreCompoundNucleon.hh"
43 #include "G4PhysicalConstants.hh"
44 #include "G4NuclearLevelData.hh"
45 #include "G4SystemOfUnits.hh"
46
47 G4PreCompoundNucleon::G4PreCompoundNucleon(
48 const G4ParticleDefinition* part, G4VCoulombBarrier* aCoulombBarrier)
49 : G4PreCompoundFragment(part,aCoulombBarrier)
50 {}
51
52 G4double G4PreCompoundNucleon::
53 ProbabilityDistributionFunction(G4double eKin,
54 const G4Fragment& aFragment)
55 {
56 G4double U = aFragment.GetExcitationEnergy();
57 G4int P = aFragment.GetNumberOfParticles();
58 G4int H = aFragment.GetNumberOfHoles();
59 G4int N = P + H;
60
61 static const G4double sixoverpi2 = 6.0/CLHEP::pi2;
62 G4double g0 = sixoverpi2*fNucData->GetLevelDensity(theFragZ, theFragA, U);
63 G4double g1 = sixoverpi2*fNucData->GetLevelDensity(theResZ, theResA, 0.0);
64
65 G4double A0 = (P*P+H*H+P-3*H)/(4.0*g0);
66 G4double A1 = (A0 - 0.5*P)/g1;
67
68 G4double E0 = U - A0;
69 if (E0 <= 0.0) { return 0.0; }
70
71 G4double E1 = U - eKin - theBindingEnergy - A1;
72 if (E1 <= 0.0) { return 0.0; }
73
74 G4double rj = GetRj(P, aFragment.GetNumberOfCharged());
75 G4double xs = CrossSection(eKin);
76
77 if (rj < 0.0 || xs < 0.0) { return 0.0; }
78
79 static const G4double fact = 2*CLHEP::millibarn
80 /(CLHEP::pi2*CLHEP::hbarc*CLHEP::hbarc*CLHEP::hbarc);
81 G4double Probability = fact * theReducedMass * rj * xs * eKin * P * (N-1)
82 * g4calc->powN(g1*E1/(g0*E0),N-2) * g1 / (E0*g0*g0);
83
84 //G4cout << "N=" << N << " g0=" << g0 << " g1=" << g1 << " E0=" << E0
85 // << " E1=" << E1 << " prob=" << Probability << G4endl;
86
87 return Probability;
88 }
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105