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G4PreCompoundIon.cc
Go to the documentation of this file.
Or view
the newest version in sPHENIX GitHub for file G4PreCompoundIon.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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//
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// GEANT4 Class file
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//
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//
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// File name: G4PreCompoundIon
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//
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// Author: V.Lara
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//
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// Modified:
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// 10.02.2009 J. M. Quesada fixed bug in level density of light fragments
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// 20.08.2010 V.Ivanchenko added G4Pow and G4PreCompoundParameters pointers
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// use int Z and A and cleanup
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//
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#include "
G4PreCompoundIon.hh
"
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#include "
G4PhysicalConstants.hh
"
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#include "
G4NuclearLevelData.hh
"
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#include "
G4DeexPrecoParameters.hh
"
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G4PreCompoundIon::
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G4PreCompoundIon
(
const
G4ParticleDefinition
*
part
,
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G4VCoulombBarrier
* aCoulombBarrier)
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:
G4PreCompoundFragment
(part,aCoulombBarrier)
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{
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G4double
r0 =
theParameters
->
GetR0
();
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fact
= 0.75*
CLHEP::millibarn
/(
CLHEP::pi
*r0*r0*r0);
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}
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G4PreCompoundIon::~G4PreCompoundIon
()
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{}
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G4double
G4PreCompoundIon::
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ProbabilityDistributionFunction
(
G4double
eKin,
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const
G4Fragment
& aFragment)
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{
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G4double
efinal = eKin +
theBindingEnergy
;
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if
(efinal <= 0.0 ) {
return
0.0; }
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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
A
=
GetA
();
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G4int
N
= P + H;
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static
const
G4double
sixoverpi2 = 6.0/
CLHEP::pi2
;
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G4double
g0 = sixoverpi2*
fNucData
->
GetLevelDensity
(
theFragZ
,
theFragA
, U);
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G4double
g1 = sixoverpi2*
fNucData
->
GetLevelDensity
(
theResZ
,
theResA
, 0.0);
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G4double
gj = g1;
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G4double
A0 =
G4double
(P*P+H*H+P-3*H)/(4.0*g0);
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G4double
A1 =
std::max
(0.0,(A0*g0 + A*(A-2*P-1)*0.25)/g1);
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G4double
E0 = U - A0;
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if
(E0 <= 0.0) {
return
0.0; }
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G4double
E1 =
std::max
(0.0,
theMaxKinEnergy
- eKin - A1);
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G4double
Aj = A*(A+1)/(4.0*gj);
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G4double
Ej =
std::max
(0.0,efinal - Aj);
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G4double
rj =
GetRj
(P, aFragment.
GetNumberOfCharged
());
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G4double
xs =
CrossSection
(eKin);
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G4double
pA =
fact
*eKin*xs*rj
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*
CoalescenceFactor
(
theFragA
) *
FactorialFactor
(N,P)
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* std::sqrt(2.0/(
theReducedMass
*efinal))
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*
g4calc
->
powN
(g1*E1/(g0*E0), N-A-1)
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*
g4calc
->
powN
(gj*Ej/(g0*E0), A-1)*gj*g1/(g0*g0*E0*
theResA
);
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return
pA;
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}
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G4double
G4PreCompoundIon::GetBeta
()
const
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{
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return
-
theCoulombBarrier
;
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}
geant4
tree
geant4-10.6-release
source
processes
hadronic
models
pre_equilibrium
exciton_model
src
G4PreCompoundIon.cc
Built by
Jin Huang
. updated:
Wed Jun 29 2022 17:25:50
using
1.8.2 with
ECCE GitHub integration