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G4NeutronElectronElXsc.cc
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26 // 16.05.17 V. Grichine first implementation
27 
28 
30 #include "G4PhysicalConstants.hh"
31 #include "G4SystemOfUnits.hh"
32 #include "G4DynamicParticle.hh"
33 #include "G4ParticleDefinition.hh"
34 #include "G4ParticleTable.hh"
35 #include "G4IonTable.hh"
36 #include "G4HadTmpUtil.hh"
37 #include "G4NistManager.hh"
38 // #include "G4Integrator.hh"
39 
40 #include "G4PhysicsLogVector.hh"
41 #include "G4PhysicsTable.hh"
42 
43 #include "G4Neutron.hh"
44 #include "G4Electron.hh"
45 
46 
47 using namespace std;
48 using namespace CLHEP;
49 
51  : G4VCrossSectionDataSet("NuElectronCcXsc")
52 {
53  // neutron magneton squared
54 
55  fM = neutron_mass_c2; // neutron mass
56  fM2 = fM*fM;
58  fme2 = fme*fme;
59  fMv2 = 0.7056*GeV*GeV;
60  fee = fme;
61  fee2 = fee*fee;
62  fAm = 0.001;
63 
65  fCofXsc *= 3.6481; // neutron Fm^2(0)
66  fCofXsc /= fM*fM;
67 
68  // G4cout<<"fCofXsc = "<<fCofXsc*GeV/cm2<<" cm2/GeV"<<G4endl;
69 
70  // G4cout<<"hbarc = "<<hbarc/MeV/fermi<<" MeV*fermi"<<G4endl;
71 
72  fCutEnergy = 0.; // default value
73 
74  fEnergyBin = 200;
75  fMinEnergy = 1.*MeV;
76  fMaxEnergy = 10000.*GeV;
77 
79 
80  for( G4int iTkin = 0; iTkin < fEnergyBin; iTkin++) fEnergyXscVector->PutValue(iTkin, fXscArray[iTkin]*microbarn);
81 
82  fBiasingFactor = 1.;
83 
84  // Initialise();
85 }
86 
88 {
89  if( fEnergyXscVector )
90  {
91  delete fEnergyXscVector;
92  fEnergyXscVector = 0;
93  }
94 }
95 
97 //
98 // For neutrons in the precalculated energy interval
99 
100 G4bool
102 {
103  G4bool result = false;
104  G4String pName = aPart->GetDefinition()->GetParticleName();
105  G4double Tkin = aPart->GetKineticEnergy();
106 
107  if( pName == "neutron" &&
108  Tkin >= fMinEnergy &&
109  Tkin <= fMaxEnergy ) result = true;
110 
111  return result;
112 }
113 
115 
117 {
118  G4int iTkin;
119  G4double Tkin, rosxsc, xsc, delta, err=1.e-5;
120  const G4ThreeVector mDir = G4ThreeVector(0.,0.,1.);
123 
125 
126  for( iTkin = 0; iTkin < fEnergyBin; iTkin++)
127  {
128  Tkin = fEnergyXscVector->GetLowEdgeEnergy(iTkin);
129  dP = G4DynamicParticle(pD, mDir, Tkin);
130  rosxsc = GetRosenbluthXsc(&dP, 1, mat);
131  fEnergyXscVector->PutValue(iTkin, rosxsc); // xscV.PutValue(evt, rosxsc); //
132  xsc= fEnergyXscVector->Value(Tkin); // xsc= xscV.GetLowEdgeEnergy(evt); //
133  delta = 0.5*std::abs( (rosxsc-xsc) )/(rosxsc+xsc);
134  if(delta > err) G4cout<<Tkin/GeV<<" GeV, rosxsc = "<<rosxsc/microbarn<<"umb, v-xsc = "<<xsc<<" umb"<<G4endl;
135  }
136  return;
137 }
138 
140 
143  const G4Material*)
144 {
145  G4double result = 0., Tkin;
146 
147  Tkin = aPart->GetKineticEnergy();
148 
149  result = fEnergyXscVector->Value(Tkin);
150 
151  result *= ZZ; // incoherent sum over all element electrons
152 
153  result *= fBiasingFactor;
154 
155  return result;
156 }
157 
159 //
160 // Integration of the Rosenbluth differential xsc
161 
164  const G4Material*)
165 {
166  G4double result = 0., momentum;
167 
168  fee = aPart->GetTotalEnergy()*fme/fM;
169  fee2 = fee*fee;
170  momentum = sqrt( fee2 - fme2 );
171  fAm = CalculateAm(momentum);
172 
173  // G4Integrator<G4NeutronElectronElXsc, G4double(G4NeutronElectronElXsc::*)(G4double)> integral;
174 
175  // result = integral.Legendre96( this, &G4NeutronElectronElXsc::XscIntegrand, 0., 1. );
176 
177  result *= fCofXsc;
178 
179  result *= ZZ; // incoherent sum over all element electrons
180 
181  return result;
182 }
183 
185 //
186 // Rosenbluth relation in the neutron rest frame,
187 // x = sin^2(theta/2), theta is the electron scattering angle
188 // Magnetic form factor in the dipole approximation.
189 
191 {
192  G4double result = 1., q2, znq2, znf, znf2, znf4;
193 
194  znq2 = 1. + 2.*fee*x/fM;
195 
196  q2 = 4.*fee2*x/znq2;
197 
198  znf = 1 + q2/fMv2;
199  znf2 = znf*znf;
200  znf4 = znf2*znf2;
201 
202  result /= ( x + fAm )*znq2*znq2*znf4;
203 
204  result *= ( 1 - x )/( 1 + q2/4./fM2 ) + 2.*x;
205 
206  return result;
207 }
208 
210 //
211 // Rosenbluth xsc in microbarn from 1*MeV to 10*Tev, 200 points
212 
214 1.52681, 1.54903, 1.57123, 1.59341, 1.61556, 1.63769, 1.6598, 1.68189, 1.70396,
215 1.72601, 1.74805, 1.77007, 1.79208, 1.81407, 1.83605, 1.85801, 1.87997, 1.90192,
216 1.92385, 1.94578, 1.96771, 1.98962, 2.01154, 2.03345, 2.05535, 2.07725, 2.09915,
217 2.12105, 2.14295, 2.16485, 2.18675, 2.20865, 2.23055, 2.25244, 2.27433, 2.29621,
218 2.31807, 2.33992, 2.36173, 2.38351, 2.40524, 2.42691, 2.4485, 2.47, 2.49138,
219 2.51262, 2.53369, 2.55457, 2.57524, 2.59565, 2.61577, 2.63559, 2.65505, 2.67414,
220 2.69281, 2.71104, 2.72881, 2.74607, 2.76282, 2.77903, 2.79467, 2.80974, 2.82422,
221 2.83811, 2.85139, 2.86408, 2.87616, 2.88764, 2.89854, 2.90885, 2.91859, 2.92777,
222 2.93641, 2.94453, 2.95213, 2.95924, 2.96588, 2.97207, 2.97782, 2.98316, 2.98811,
223 2.99268, 2.9969, 3.00078, 3.00435, 3.00761, 3.01059, 3.01331, 3.01578, 3.01801,
224 3.02003, 3.02185, 3.02347, 3.02491, 3.02619, 3.02732, 3.0283, 3.02915, 3.02988,
225 3.03049, 3.03099, 3.03139, 3.03169, 3.03191, 3.03203, 3.03208, 3.03205, 3.03195,
226 3.03177, 3.03152, 3.0312, 3.03081, 3.03034, 3.0298, 3.02919, 3.02849, 3.02771,
227 3.02684, 3.02588, 3.02482, 3.02365, 3.02237, 3.02097, 3.01943, 3.01775, 3.0159,
228 3.01389, 3.01169, 3.00929, 3.00666, 3.00379, 3.00065, 2.99722, 2.99347, 2.98936,
229 2.98487, 2.97996, 2.97459, 2.9687, 2.96226, 2.9552, 2.94748, 2.93903, 2.92977,
230 2.91965, 2.90858, 2.89649, 2.88329, 2.86889, 2.85321, 2.83615, 2.81764, 2.7976,
231 2.77594, 2.7526, 2.72754, 2.70071, 2.67209, 2.64171, 2.60957, 2.57575, 2.54031,
232 2.50336, 2.46504, 2.42548, 2.38484, 2.34328, 2.30099, 2.2581, 2.21478, 2.17115,
233 2.12735, 2.08345, 2.03954, 1.99569, 1.95191, 1.90825, 1.86471, 1.82129, 1.77799,
234 1.7348, 1.69171, 1.64869, 1.60575, 1.56286, 1.52, 1.47718, 1.43437, 1.39157,
235 1.34877, 1.30596, 1.26314, 1.22031, 1.17746, 1.13459, 1.0917, 1.04879, 1.00585,
236 0.962892, 0.919908 };
Float_t x
Definition: compare.C:6
CLHEP::Hep3Vector G4ThreeVector
static constexpr double MeV
Definition: G4SIunits.hh:214
G4double GetLowEdgeEnergy(size_t binNumber) const
G4double CalculateAm(G4double momentum)
#define G4endl
Definition: G4ios.hh:61
static constexpr double hbarc
const G4String & GetParticleName() const
G4double Value(G4double theEnergy, size_t &lastidx) const
G4double XscIntegrand(G4double x)
virtual G4double GetElementCrossSection(const G4DynamicParticle *, G4int Z, const G4Material *)
static constexpr double neutron_mass_c2
double G4double
Definition: G4Types.hh:76
bool G4bool
Definition: G4Types.hh:79
G4ParticleDefinition * GetDefinition() const
static const G4double fXscArray[200]
static constexpr double electron_mass_c2
G4double GetRosenbluthXsc(const G4DynamicParticle *, G4int Z, const G4Material *)
G4Material * FindOrBuildMaterial(const G4String &name, G4bool isotopes=true, G4bool warning=false)
Float_t mat
G4PhysicsLogVector * fEnergyXscVector
G4double G4ParticleHPJENDLHEData::G4double result
static constexpr double microbarn
Definition: G4SIunits.hh:107
virtual G4bool IsElementApplicable(const G4DynamicParticle *, G4int Z, const G4Material *)
int G4int
Definition: G4Types.hh:78
static G4Neutron * Neutron()
Definition: G4Neutron.cc:104
G4double GetKineticEnergy() const
G4GLOB_DLL std::ostream G4cout
static constexpr double pi
Definition: G4SIunits.hh:75
G4double GetTotalEnergy() const
static constexpr double fine_structure_const
static constexpr double GeV
Definition: G4SIunits.hh:217
void PutValue(size_t index, G4double theValue)
static G4NistManager * Instance()