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G4RToEConvForPositron.cc
Go to the documentation of this file.
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//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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//
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// $Id: G4RToEConvForPositron.cc 70745 2013-06-05 10:54:00Z gcosmo $
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//
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//
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// --------------------------------------------------------------
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// GEANT 4 class implementation file/ History:
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// 5 Oct. 2002, H.Kuirashige : Structure created based on object model
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// --------------------------------------------------------------
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#include "
G4RToEConvForPositron.hh
"
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#include "
G4ParticleDefinition.hh
"
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#include "
G4ParticleTable.hh
"
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#include "
G4Material.hh
"
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#include "
G4PhysicsLogVector.hh
"
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#include "
G4ios.hh
"
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#include "
G4PhysicalConstants.hh
"
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#include "
G4SystemOfUnits.hh
"
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G4RToEConvForPositron::G4RToEConvForPositron
()
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:
G4VRangeToEnergyConverter
(),
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Mass(0.0),
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Z
(-1.),
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taul(0.0),
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ionpot(0.0),
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ionpotlog(-1.0e-10),
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bremfactor(0.1)
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{
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theParticle
=
G4ParticleTable::GetParticleTable
()->
FindParticle
(
"e+"
);
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if
(
theParticle
==0) {
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#ifdef G4VERBOSE
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if
(
GetVerboseLevel
()>0) {
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G4cout
<<
" G4RToEConvForPositron::G4RToEConvForPositron() "
;
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G4cout
<<
" Positron is not defined !!"
<<
G4endl
;
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}
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#endif
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}
else
{
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Mass
=
theParticle
->
GetPDGMass
();
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}
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}
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G4RToEConvForPositron::~G4RToEConvForPositron
()
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{
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}
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// **********************************************************************
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// ************************* ComputeLoss ********************************
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// **********************************************************************
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G4double
G4RToEConvForPositron::ComputeLoss
(
G4double
AtomicNumber,
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G4double
KineticEnergy)
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{
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const
G4double
cbr1=0.02, cbr2=-5.7e-5, cbr3=1., cbr4=0.072;
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const
G4double
Tlow=10.*
keV
, Thigh=1.*
GeV
;
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// calculate dE/dx for electrons
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if
( std::fabs(AtomicNumber-
Z
)>0.1 ) {
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Z
= AtomicNumber;
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taul
= Tlow/
Mass
;
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ionpot
= 1.6e-5*
MeV
*std::exp(0.9*std::log(
Z
))/
Mass
;
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ionpotlog
= std::log(
ionpot
);
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}
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G4double
tau = KineticEnergy/
Mass
;
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G4double
dEdx;
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if
(tau<
taul
)
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{
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G4double
t1 =
taul
+1.;
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G4double
t2 =
taul
+2.;
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G4double
tsq =
taul
*
taul
;
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G4double
beta2 = taul*t2/(t1*t1);
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G4double
f = 2.*std::log(taul)
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-(6.*taul+1.5*tsq-taul*(1.-tsq/3.)/t2-tsq*(0.5-tsq/12.)/
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(t2*t2))/(t1*t1);
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dEdx = (std::log(2.*taul+4.)-2.*
ionpotlog
+f)/beta2;
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dEdx =
twopi_mc2_rcl2
*
Z
*dEdx;
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G4double
clow = dEdx*std::sqrt(taul);
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dEdx = clow/std::sqrt(KineticEnergy/
Mass
);
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}
else
{
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G4double
t1 = tau+1.;
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G4double
t2 = tau+2.;
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G4double
tsq = tau*tau;
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G4double
beta2 = tau*t2/(t1*t1);
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G4double
f = 2.*std::log(tau)
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- (6.*tau+1.5*tsq-tau*(1.-tsq/3.)/t2-tsq*(0.5-tsq/12.)/
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(t2*t2))/(t1*t1);
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dEdx = (std::log(2.*tau+4.)-2.*
ionpotlog
+f)/beta2;
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dEdx =
twopi_mc2_rcl2
*
Z
*dEdx;
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// loss from bremsstrahlung follows
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G4double
cbrem = (cbr1+cbr2*
Z
)
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*(cbr3+cbr4*std::log(KineticEnergy/Thigh));
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cbrem =
Z
*(
Z
+1.)*cbrem*tau/beta2;
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cbrem *=
bremfactor
;
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dEdx +=
twopi_mc2_rcl2
*cbrem;
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}
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return
dEdx;
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}
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G4RToEConvForPositron::Mass
G4double Mass
Definition:
G4RToEConvForPositron.hh:67
G4ParticleTable::FindParticle
G4ParticleDefinition * FindParticle(G4int PDGEncoding)
Definition:
G4ParticleTable.cc:566
G4VRangeToEnergyConverter::GetVerboseLevel
G4int GetVerboseLevel() const
Definition:
G4VRangeToEnergyConverter.hh:165
CLHEP::twopi_mc2_rcl2
static constexpr double twopi_mc2_rcl2
Definition:
PhysicalConstants.h:105
G4RToEConvForPositron::~G4RToEConvForPositron
virtual ~G4RToEConvForPositron()
Definition:
G4RToEConvForPositron.cc:67
G4PhysicsLogVector.hh
G4RToEConvForPositron.hh
G4cout
G4GLOB_DLL std::ostream G4cout
G4RToEConvForPositron::ionpotlog
G4double ionpotlog
Definition:
G4RToEConvForPositron.hh:71
G4RToEConvForPositron::ionpot
G4double ionpot
Definition:
G4RToEConvForPositron.hh:70
G4ParticleTable.hh
G4RToEConvForPositron::G4RToEConvForPositron
G4RToEConvForPositron()
Definition:
G4RToEConvForPositron.cc:45
G4Material.hh
G4RToEConvForPositron::bremfactor
G4double bremfactor
Definition:
G4RToEConvForPositron.hh:72
G4ParticleDefinition.hh
G4RToEConvForPositron::Z
G4double Z
Definition:
G4RToEConvForPositron.hh:68
G4PhysicalConstants.hh
G4ParticleDefinition::GetPDGMass
G4double GetPDGMass() const
Definition:
G4ParticleDefinition.hh:122
G4ParticleTable::GetParticleTable
static G4ParticleTable * GetParticleTable()
Definition:
G4ParticleTable.cc:96
G4ios.hh
GeV
static constexpr double GeV
Definition:
G4SIunits.hh:217
G4endl
#define G4endl
Definition:
G4ios.hh:61
G4RToEConvForPositron::taul
G4double taul
Definition:
G4RToEConvForPositron.hh:69
MeV
static constexpr double MeV
Definition:
G4SIunits.hh:214
G4double
double G4double
Definition:
G4Types.hh:76
G4RToEConvForPositron::ComputeLoss
virtual G4double ComputeLoss(G4double AtomicNumber, G4double KineticEnergy)
Definition:
G4RToEConvForPositron.cc:77
G4SystemOfUnits.hh
keV
static constexpr double keV
Definition:
G4SIunits.hh:216
Z
G4int Z
Definition:
G4ParticleHPJENDLHEData.cc:262
G4VRangeToEnergyConverter
Definition:
G4VRangeToEnergyConverter.hh:58
G4VRangeToEnergyConverter::theParticle
const G4ParticleDefinition * theParticle
Definition:
G4VRangeToEnergyConverter.hh:114
geant4.10.03.p01
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processes
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src
G4RToEConvForPositron.cc
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