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G4HETCFragment.cc
Go to the documentation of this file.
Or view
the newest version in sPHENIX GitHub for file G4HETCFragment.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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// by V. Lara
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//
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// Modified:
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// 23.08.2010 V.Ivanchenko general cleanup, move constructor and destructor
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// the source, use G4Pow
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#include "
G4HETCFragment.hh
"
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#include "
G4DeexPrecoParameters.hh
"
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#include "
G4NuclearLevelData.hh
"
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#include "
G4PhysicalConstants.hh
"
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G4HETCFragment::
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G4HETCFragment
(
const
G4ParticleDefinition
*
part
,
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G4VCoulombBarrier
* aCoulombBarrier)
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:
G4VPreCompoundFragment
(part, aCoulombBarrier)
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{
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G4double
r0 =
theParameters
->
GetR0
();
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r2norm
= r0*r0/(
CLHEP::pi
*
CLHEP::hbarc
*
CLHEP::hbarc
*
CLHEP::hbarc
);
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}
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G4HETCFragment::~G4HETCFragment
()
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{}
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G4double
G4HETCFragment::
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CalcEmissionProbability
(
const
G4Fragment
& aFragment)
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{
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if
(
GetEnergyThreshold
() <= 0.0)
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{
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theEmissionProbability
= 0.0;
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return
0.0;
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}
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// Coulomb barrier is the lower limit
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// of integration over kinetic energy
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theEmissionProbability
=
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IntegrateEmissionProbability
(
theCoulombBarrier
,
theMaxKinEnergy
,aFragment);
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return
theEmissionProbability
;
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}
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G4double
G4HETCFragment::
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IntegrateEmissionProbability
(
G4double
& Low,
G4double
& Up,
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const
G4Fragment
& aFragment)
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{
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G4double
U = aFragment.
GetExcitationEnergy
();
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G4int
P
= aFragment.
GetNumberOfParticles
();
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G4int
H
= aFragment.
GetNumberOfHoles
();
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G4int
N
= P + H;
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G4int
Pb = P -
theA
;
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G4int
Nb = Pb + H;
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if
(Nb <= 0.0) {
return
0.0; }
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G4double
ga = (6.0/
pi2
)*
fNucData
->
GetLevelDensity
(
theFragZ
,
theFragA
,U);
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G4double
gb = (6.0/
pi2
)*
fNucData
->
GetLevelDensity
(
theResZ
,
theResA
,U);
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G4double
A
=
G4double
(P*P+H*H+P-3*H)/(4.0*ga);
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G4double
Ab =
G4double
(Pb*Pb+H*H+Pb-3*H)/(4.0*gb);
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U =
std::max
(U-A,0.0);
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if
(U <= 0.0) {
return
0.0; }
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G4int
Pf
=
P
;
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G4int
Hf = H;
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G4int
Nf = N-1;
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for
(
G4int
i = 1; i <
theA
; ++i)
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{
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Pf *= (P-i);
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Hf *= (H-i);
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Nf *= (N-1-i);
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}
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G4double
X
=
std::max
(Up - Ab +
GetBeta
(),0.0);
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G4double
Y
=
std::max
(Up - Ab - Low, 0.0);
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G4double
Probability =
r2norm
*
GetSpinFactor
()*
theReducedMass
*
GetAlpha
()
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*
g4calc
->
Z23
(
theResA
)*Pf*Hf*Nf*
K
(aFragment)*(X/Nb - Y/(Nb+1))
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*U*
g4calc
->
powN
(gb*Y,Nb)/
g4calc
->
powN
(ga*U,N);
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return
Probability;
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}
geant4
tree
geant4-10.6-release
source
processes
hadronic
models
pre_equilibrium
exciton_model
src
G4HETCFragment.cc
Built by
Jin Huang
. updated:
Wed Jun 29 2022 17:25:49
using
1.8.2 with
ECCE GitHub integration