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G4VPolarizedCrossSection.cc
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26 // $Id: G4VPolarizedCrossSection.cc 91742 2015-08-04 11:48:51Z gcosmo $
27 // File name: G4VPolarizedCrossSection
28 //
29 // Author: Andreas Schaelicke
30 //
31 // Creation date: 15.05.2005
32 //
33 // Modifications:
34 //
35 // Class Description:
36 // (pure virtual) interface class
37 //
38 // provides readable but efficient routines to determine
39 // polarization for the final state of a given process
40 // empoying the differential cross section
41 //
42 
44 #include "Randomize.hh"
45 
47  fXmin(0), fXmax(1.), fYmin(1.), theA(1), theZ(1), fCoul(0.)
48 {
49 }
50 
52 {
53 }
54 
56  const G4StokesVector &,
57  const G4StokesVector &,
58  G4int )
59 {
60 }
61 
63 {
64  // neglects correlation effects!
65 
70  return G4ThreeVector(invXsecTotal*xsPol1,invXsecTotal*xsPol2,invXsecTotal*xsPol3);
71 }
72 
74 {
75  // neglects correlation effects!
76 
81  return G4ThreeVector(invXsecTotal*xsPol1,invXsecTotal*xsPol2,invXsecTotal*xsPol3);
82 }
83 // minimal energy fraction in TotalXSection
85 {
86  return fXmin;
87 }
88 
89 // maximal energy fraction in TotalXSection
91 {
92  return fXmax;
93 }
94 
95 
96 /*
97 void G4VPolarizedCrossSection::DicePolarization()
98 {
99  // can respect correlation effects, but is limited to
100  // one quantization axis!
101  G4double sigma[4];
102  sigma[0]=XSection(G4StokesVector::P3,G4StokesVector::P3);
103  sigma[1]=XSection(G4StokesVector::P3,G4StokesVector::M3);
104  sigma[2]=XSection(G4StokesVector::M3,G4StokesVector::P3);
105  sigma[3]=XSection(G4StokesVector::M3,G4StokesVector::M3);
106 
107  G4double sigma_max = 4. * XSection(G4StokesVector::ZERO,G4StokesVector::ZERO);
108 
109  for (G4int i=0;i<4;++i) {
110  G4cout<<"sigma="<<sigma[i]<<" vs."<<(.25*sigma_max)<<G4endl;
111  if (sigma[i]<0 || sigma[i]>sigma_max) {
112  G4cout<<"ERROR G4VPolarizedCrossSection::DicePolarization(["<<i<<"]): "
113  <<sigma[i]<<" vs."<<sigma_max<<G4endl;
114  }
115  if (i>0) sigma[i]+=sigma[i-1];
116  }
117 
118  G4int k = 0;
119  G4double disc = sigma[3]*G4UniformRand();
120  // Loop checking, 03-Aug-2015, Vladimir Ivanchenko
121  while (sigma[k]<disc && k<4) {
122  ++k;
123  }
124 
125  if ((k&2)==0) pol2=G4StokesVector::P3;
126  else pol2=G4StokesVector::M3;
127  if ((k&1)==0) pol3=G4StokesVector::P3;
128  else pol3=G4StokesVector::M3;
129 
130 }
131 */
132 
133 /*
134 G4StokesVector G4VPolarizedCrossSection::DicedPol2()
135 {
136  return pol2;
137 }
138 
139 G4StokesVector G4VPolarizedCrossSection::DicedPol3()
140 {
141  return pol3;
142 }
143 */
144 
146  const G4StokesVector &,const G4StokesVector &)
147 {
148  G4cout << "WARNING virtual function G4VPolarizedCrossSection::TotalXSection() called" << G4endl;
149  return 0.;
150 }
CLHEP::Hep3Vector G4ThreeVector
virtual G4double XSection(const G4StokesVector &pol2, const G4StokesVector &pol3)=0
int G4int
Definition: G4Types.hh:78
virtual G4StokesVector GetPol2()
static const G4StokesVector P3
G4GLOB_DLL std::ostream G4cout
static const G4StokesVector P2
virtual G4double GetXmin(G4double y)
static const G4StokesVector P1
virtual G4StokesVector GetPol3()
virtual G4double GetXmax(G4double y)
#define G4endl
Definition: G4ios.hh:61
virtual G4double TotalXSection(G4double xmin, G4double xmax, G4double y, const G4StokesVector &pol0, const G4StokesVector &pol1)
double G4double
Definition: G4Types.hh:76
static const G4StokesVector ZERO
virtual void Initialize(G4double, G4double, G4double, const G4StokesVector &p0, const G4StokesVector &p1, G4int flag=0)