Geant4  10.02.p02
G4ChatterjeeCrossSection.hh
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27 // $Id: G4ChatterjeeCrossSection.hh 66241 2012-12-13 18:34:42Z gunter $
28 //
29 // V.Ivanchenko 13.04.2015
30 //
31 // J.M. Quesada 22.04.2015 several fixes
32 
33 #ifndef G4ChatterjeeCrossSection_h
34 #define G4ChatterjeeCrossSection_h 1
35 
36 #include "globals.hh"
37 #include "G4Pow.hh"
38 
39 static const G4double emax = 50*CLHEP::MeV;
40 
41 // index: 0-neutron, 1-proton, 2-deuteron, 3-triton, 4-He3, 5-He4
42 // parameters: p0, p1, p2, landa0, landa1, mu0, mu1, nu0, nu1, nu2, ra
43 
44 static const G4double paramC[6][11] = {
45 // n from Becchetti and Greenlees
46  { 0., 0., 0., 18.57, -22.93, 381.7, 24.31, 0.172, -15.39, 804.8, 0.0},
47 // p from Bechetti and Greenlees
48  {15.72, 9.65, -449., 0.00437,-16.58, 244.7, 0.503, 273.1, -182.4, -1.872, 0.0},
49 // d from Lohr and Haeberli
50  {-38.21,922.6,-2804.,-0.0323, -5.48, 336.1, 0.48, 524.3, -371.8, -5.924, 1.2},
51 // t from Becchetti and Greenlees
52  {-11.04,619.1,-2147., 0.0426, -10.33, 601.9, 0.37, 583.0, -546.2, 1.718, 1.2},
53 // 3he from Becchetti and Greenlees
54  {-3.06, 278.5,-1389.,-0.00535,-11.16, 555.5, 0.4, 687.4, -476.3, 0.509, 1.2},
55 // alpha from huizenga and igo
56  {10.95, -85.2, 1146., 0.0643, -13.96, 781.2, 0.29, -304.7, -470.0, -8.58, 1.2}
57 };
58 
60 {
61 public:
62 
64  {
65  return G4Pow::GetInstance()->powZ(resA, paramC[idx][6]);
66  }
67 
69  G4int idx, G4int Z, G4int resZ, G4int resA)
70  {
71  G4double sig;
72  G4double Kc = std::min(K, emax);
73 
74  // parameterisation for neutron
75  if(0 == Z) {
76  G4double landa = paramC[idx][3]/resA13 + paramC[idx][4];
77  G4double mu = paramC[idx][5]*resA13 + paramC[idx][6]*resA13*resA13;
78  G4double nu = paramC[idx][7]*resA13*resA + paramC[idx][8]*resA13*resA13
79  + paramC[idx][9];
80  sig = landa*Kc + mu + nu/Kc;
81 
82  // parameterisation for charged
83  } else {
84  //JMQ 20.04.2015 1.5 F
85  G4double ec = 1.44 * Z * resZ / (1.5*resA13 + paramC[idx][10]);
86  G4double ecsq = ec*ec;
87  G4double p = paramC[idx][0] + paramC[idx][1]/ec + paramC[idx][2]/(ecsq);
88  G4double landa = paramC[idx][3]*resA + paramC[idx][4];
89  G4double mu = paramC[idx][5]*amu1;
90  G4double nu = amu1* (paramC[idx][7] + paramC[idx][8]*ec + paramC[idx][9]*ecsq);
91  G4double q = landa - nu/ecsq - 2*p*ec;
92  G4double r = mu + 2*nu/ec + p*ecsq;
93  G4double ji= std::max(Kc, ec);
94  if(Kc < ec) { sig = p*Kc*Kc + q*Kc + r; }
95  else { sig = p*(Kc - ji)*(Kc - ji) + landa*Kc + mu + nu*(2 - Kc/ji)/ji; }
96  }
97  sig = std::max(sig, 0.0);
98  return sig;
99  }
100 };
101 
102 #endif
static G4Pow * GetInstance()
Definition: G4Pow.cc:55
static const double MeV
Definition: G4SIunits.hh:211
static G4double ComputePowerParameter(G4int resA, G4int idx)
static G4double ComputeCrossSection(G4double K, G4double resA13, G4double amu1, G4int idx, G4int Z, G4int resZ, G4int resA)
int G4int
Definition: G4Types.hh:78
static const G4double paramC[6][11]
static const G4double emax
T max(const T t1, const T t2)
brief Return the largest of the two arguments
T min(const T t1, const T t2)
brief Return the smallest of the two arguments
G4double powZ(G4int Z, G4double y) const
Definition: G4Pow.hh:254
double G4double
Definition: G4Types.hh:76