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This commit is contained in:
Gabriele Cosmo
2016-06-08 15:28:20 +02:00
parent aaa409b6ee
commit ca1c8cb059
2995 changed files with 106830 additions and 299600 deletions
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source/processes/electromagnetic/lowenergy/src/G4LowEnergyCompton.cc
+29 -14
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@@ -1,12 +1,12 @@
// This code implementation is the intellectual property of
// the RD44 GEANT4 collaboration.
// the GEANT4 collaboration.
//
// By copying, distributing or modifying the Program (or any work
// based on the Program) you indicate your acceptance of this statement,
// and all its terms.
//
// $Id: G4LowEnergyCompton.cc,v 1.12 1999/07/06 15:03:02 aforti Exp $
// GEANT4 tag $Name: geant4-00-01 $
// $Id: G4LowEnergyCompton.cc,v 1.15.6.1 1999/12/07 20:50:24 gunter Exp $
// GEANT4 tag $Name: geant4-01-00 $
//
//
// --------------------------------------------------------------
@@ -19,6 +19,9 @@
// 2nd December 1995, G.Cosmo
// ------------ G4LowEnergyCompton physics process --------
// by Michel Maire, April 1996
// ------------ G4LowEnergyCompton low energy modifications --------
// by Alessandra Forti, October 1998
// **************************************************************
// 28-05-96, DoIt() small change in ElecDirection, by M.Maire
// 10-06-96, simplification in ComputeMicroscopicCrossSection(), by M.Maire
@@ -29,6 +32,11 @@
// 28-03-97, protection in BuildPhysicsTable, M.Maire
// 07-04-98, remove 'tracking cut' of the scattered gamma, MMa
// 04-06-98, in DoIt, secondary production condition: range>min(threshold,safety)
// Added Livermore data table construction methods A. Forti
// Modified BuildMeanFreePath to read new data tables A. Forti
// Modified PostStepDoIt to insert sampling with EPDL97 data A. Forti
// Added SelectRandomAtom A. Forti
// Added map of the elements A. Forti
// --------------------------------------------------------------
// This Class Header
@@ -86,8 +94,6 @@ G4LowEnergyCompton::~G4LowEnergyCompton()
// methods.............................................................................
// to change with other functions like in G4eIonization
void G4LowEnergyCompton::BuildPhysicsTable(const G4ParticleDefinition& GammaType){
BuildZVec();
@@ -102,7 +108,7 @@ void G4LowEnergyCompton::BuildPhysicsTable(const G4ParticleDefinition& GammaType
BuildScatteringFunctionTable();
}
// BUILD THE CS TABLE FOR THE ELEMENTS MAPPED IN ZNUMVEC
void G4LowEnergyCompton::BuildCrossSectionTable(){
if (theCrossSectionTable) {
@@ -123,7 +129,7 @@ void G4LowEnergyCompton::BuildCrossSectionTable(){
}//end for on atoms
}
// BUILD THE SF TABLE FOR THE ELEMENTS MAPPED IN ZNUMVEC
void G4LowEnergyCompton::BuildScatteringFunctionTable(){
if (theScatteringFunctionTable) {
@@ -144,7 +150,7 @@ void G4LowEnergyCompton::BuildScatteringFunctionTable(){
}//end for on atoms
}
// vector mapping the elements in the material table
void G4LowEnergyCompton::BuildZVec(){
const G4MaterialTable* theMaterialTable=G4Material::GetMaterialTable();
@@ -184,6 +190,15 @@ G4VParticleChange* G4LowEnergyCompton::PostStepDoIt(const G4Track& aTrack, const
//
// The scattered gamma energy is sampled according to Klein - Nishina formula.
// And then Accepted or rejected basing of the Scattering Function multiplied by factor
// from Klein - Nishina formula. Expression of the angular distribution as Klein Nishina
// angular and energy distribution and Scattering fuctions is taken from
// D. E. Cullen "A simple model of photon transport" Nucl. Instr. Meth.
// Phys. Res. B 101 (1995). Method of sampling with form factors is different
// data are interpolated while in the article they are fitted.
// Reference to the article is from J. Stepanek New Photon, Positron
// and Electron Interaction Data for GEANT in Energy Range from 1 eV to 10
// TeV (draft).
// The random number techniques of Butcher & Messel are used
// (Nuc Phys 20(1960),15).
// GEANT4 internal units
@@ -247,7 +262,7 @@ G4VParticleChange* G4LowEnergyCompton::PostStepDoIt(const G4Track& aTrack, const
greject = (1. - epsilon*sint2/(1.+ epsilonsq))*ScatteringFunction;
} while(greject < elementZ*G4UniformRand());
} while(greject < G4UniformRand()*elementZ);
G4double cosTeta = 1. - onecost , sinTeta = sqrt (sint2);
G4double Phi = twopi * G4UniformRand() ;
@@ -305,7 +320,8 @@ G4VParticleChange* G4LowEnergyCompton::PostStepDoIt(const G4Track& aTrack, const
return G4VDiscreteProcess::PostStepDoIt( aTrack, aStep);
}
// used log-log interpolation instead of linear interpolation to build the MFP
// as reported in the stepanek paper
void G4LowEnergyCompton::BuildMeanFreePathTable(){
if (theMeanFreePathTable) {
@@ -359,7 +375,8 @@ void G4LowEnergyCompton::BuildMeanFreePathTable(){
}
}
// METHOD BELOW FROM STANDARD E_M PROCESSES CODE MODIFIED TO USE
// LIVERMORE DATA (using log-log interpolation as reported in stepanek paper)
G4Element* G4LowEnergyCompton::SelectRandomAtom(const G4DynamicParticle* aDynamicGamma,
G4Material* aMaterial){
// select randomly 1 element within the material
@@ -370,7 +387,7 @@ G4Element* G4LowEnergyCompton::SelectRandomAtom(const G4DynamicParticle* aDynami
if (NumberOfElements == 1) return (*theElementVector)(0);
const G4double* theAtomNumDensityVector = aMaterial->GetAtomicNumDensityVector();
//GetMeanFreePath
G4double PartialSumSigma = 0.;
G4double rval = 0;
@@ -397,8 +414,6 @@ G4Element* G4LowEnergyCompton::SelectRandomAtom(const G4DynamicParticle* aDynami
if(rval <= PartialSumSigma) return ((*theElementVector)(i));
}
// G4cout << " WARNING !!! - The Material '"<< aMaterial->GetName()
// << "' has no elements" << endl;
return (*theElementVector)(0);
}