| 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 // Hadronic Process: Nuclear De-excitations
28 // by V. Lara (Dec 1999)
29 //
30 // 14-11-2007 modified barrier by JMQ (test30)
31 // 15-11-2010 V.Ivanchenko use G4Pow and cleanup
32
33 #include "G4CoulombBarrier.hh"
34 #include "G4PhysicalConstants.hh"
35 #include "G4SystemOfUnits.hh"
36 #include "G4NuclearRadii.hh"
37
38 G4CoulombBarrier::G4CoulombBarrier(G4int A, G4int Z)
39 : G4VCoulombBarrier(A, Z)
40 {
41 factor = CLHEP::elm_coupling*Z;
42 SetParameters(0.4*G4NuclearRadii::RadiusCB(Z, A), 1.5*CLHEP::fermi);
43 }
44
45 G4double G4CoulombBarrier::GetCoulombBarrier(
46 G4int ARes, G4int ZRes, G4double U) const
47 {
48 if (0 == theZ) { return 0.0; }
49 G4double cb = factor*ZRes/(G4NuclearRadii::RadiusCB(ZRes,ARes) + theRho);
50 if (U > 0.0) { cb /= (1.0 + std::sqrt( U/((2*(ARes + theA))*CLHEP::MeV) )); }
51 return cb;
52 }
53
54 G4double G4CoulombBarrier::BarrierPenetrationFactor(G4int aZ) const
55 {
56 // Data comes from
57 // Dostrovsky, Fraenkel and Friedlander
58 // Physical Review, vol 116, num. 3 1959
59 //
60 // const G4int size = 5;
61 // const G4double Zlist[size] = {10.0, 20.0, 30.0, 50.0, 70.0};
62 // const G4double Kprot[size] = {0.42, 0.58, 0.68, 0.77, 0.80};
63 //
64 G4double res = 1.0;
65 if(theZ == 1) {
66 res = (aZ >= 70) ? 0.80 :
67 (((0.2357e-5*aZ) - 0.42679e-3)*aZ + 0.27035e-1)*aZ + 0.19025;
68 res += 0.06*(theA - 1);
69
70 } else if(theZ == 2 && theA <= 4) {
71 res = (aZ >= 70) ? 0.98 :
72 (((0.23684e-5*aZ) - 0.42143e-3)*aZ + 0.25222e-1)*aZ + 0.46699;
73 res += 0.12*(4 - theA);
74 }
75 return res;
76 }
77