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9.6.p02
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geant4_9_6_p02
source
processes
hadronic
models
binary_cascade
src
G4SigmaZeroField.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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// * 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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// * 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: G4SigmaZeroField.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 "
G4SigmaZeroField.hh
"
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#include "
G4PhysicalConstants.hh
"
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#include "
G4NucleiProperties.hh
"
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#include "
G4VNuclearDensity.hh
"
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#include "
G4FermiMomentum.hh
"
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#include "
G4SigmaZero.hh
"
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#include "
G4HadTmpUtil.hh
"
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G4SigmaZeroField::G4SigmaZeroField
(
G4V3DNucleus
* nucleus,
G4double
coeff)
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:
G4VNuclearField
(nucleus)
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{
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theCoeff = coeff;
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}
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G4SigmaZeroField::~G4SigmaZeroField
()
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{ }
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G4double
G4SigmaZeroField::GetField
(
const
G4ThreeVector
& aPosition)
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{
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// Field is 0 out of the nucleus!
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if
(aPosition.
mag
() >=
radius
)
return
0.0;
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G4double
sigmaZeroMass =
G4SigmaZero::SigmaZero
()->
GetPDGMass
();
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G4int
A =
theNucleus
->
GetMassNumber
();
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G4int
Z
=
theNucleus
->
GetCharge
();
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G4double
bindingEnergy
=
G4NucleiProperties::GetBindingEnergy
(A, Z);
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G4double
nucleusMass = Z*
proton_mass_c2
+(A-
Z
)*
neutron_mass_c2
+bindingEnergy;
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G4double
reducedMass = sigmaZeroMass*nucleusMass/(sigmaZeroMass+nucleusMass);
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const
G4VNuclearDensity
* nuclearDensity=
theNucleus
->
GetNuclearDensity
();
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G4double
density
= nuclearDensity->
GetDensity
(aPosition);
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return
-2.*
pi
*
hbarc
*
hbarc
/reducedMass*(2.0)*theCoeff*
density
;
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}
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G4double
G4SigmaZeroField::GetBarrier
()
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{
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return
0.;
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}
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