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G4NeutronField.cc
Go to the documentation of this file.
Or view
the newest version in sPHENIX GitHub for file G4NeutronField.cc
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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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// -------------------------------------------------------------------
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// GEANT 4 class implementation file
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//
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// CERN, Geneva, Switzerland
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//
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// File name: G4NeutronField.cc
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//
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// Author: Alessandro Brunengo (Alessandro.Brunengo@ge.infn.it)
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//
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// Creation date: 5 June 2000
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// -------------------------------------------------------------------
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#include "
G4NeutronField.hh
"
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#include "
G4PhysicalConstants.hh
"
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#include "
G4SystemOfUnits.hh
"
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#include "
G4VNuclearDensity.hh
"
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#include "
G4FermiMomentum.hh
"
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G4NeutronField::G4NeutronField
(
G4V3DNucleus
* aNucleus) :
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G4VNuclearField
(aNucleus), theDensity(theNucleus->GetNuclearDensity())
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{
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theA
=
theNucleus
->
GetMassNumber
();
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theZ
=
theNucleus
->
GetCharge
();
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theFermi
.
Init
(
theA
,
theZ
);
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theR
= 2.*
theNucleus
->
GetOuterRadius
();
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for
(
G4double
aR=0.;aR<
theR
; aR+=0.3*
fermi
)
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{
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G4ThreeVector
aPosition(0,0,aR);
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G4double
density =
GetDensity
(aPosition);
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G4double
fermiMom =
GetFermiMomentum
(density);
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theFermiMomBuffer
.push_back(fermiMom);
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}
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{
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G4ThreeVector
aPosition(0,0,theR);
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G4double
density =
GetDensity
(aPosition);
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G4double
fermiMom =
GetFermiMomentum
(density);
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theFermiMomBuffer
.push_back(fermiMom);
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}
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{
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G4ThreeVector
aPosition(0,0,theR+0.001*
fermi
);
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theFermiMomBuffer
.push_back(0);
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}
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{
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G4ThreeVector
aPosition(0,0,1.*
m
);
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theFermiMomBuffer
.push_back(0);
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}
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}
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G4NeutronField::~G4NeutronField
()
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{ }
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G4double
G4NeutronField::GetField
(
const
G4ThreeVector
& aPosition)
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{
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G4double
x
= aPosition.
mag
();
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unsigned
int
index =
static_cast<
unsigned
int
>
(x/(0.3*
fermi
));
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if
( (index+2) >
theFermiMomBuffer
.size())
return
theFermiMomBuffer
.back();
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G4double
y1
=
theFermiMomBuffer
[index];
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G4double
y2
=
theFermiMomBuffer
[index+1];
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G4double
x1
= (0.3*
fermi
)*index;
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G4double
x2
= (0.3*
fermi
)*(index+1);
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G4double
fermiMom = y1 + (x-
x1
)*(y2-y1)/(x2-
x1
);
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return
-1*(fermiMom*fermiMom)/(2*
neutron_mass_c2
);
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}
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G4double
G4NeutronField::GetBarrier
()
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{
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/*
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* G4double A = theNucleus->GetMassNumber();
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* G4double Z = theNucleus->GetCharge();
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*
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* return G4NucleiPropertiesTable::GetBindingEnergy(Z, A)/A;
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*/
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return
0.;
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}
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geant4-10.6-release
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G4NeutronField.cc
Built by
Jin Huang
. updated:
Wed Jun 29 2022 17:25:39
using
1.8.2 with
ECCE GitHub integration