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G4HETCNeutron.cc
Go to the documentation of this file.
Or view
the newest version in sPHENIX GitHub for file G4HETCNeutron.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 "
G4HETCNeutron.hh
"
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#include "
G4PhysicalConstants.hh
"
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#include "
G4SystemOfUnits.hh
"
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#include "
G4Neutron.hh
"
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#include "
G4NuclearLevelData.hh
"
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G4HETCNeutron::G4HETCNeutron
()
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:
G4HETCFragment
(
G4Neutron
::
Neutron
(), &theNeutronCoulombBarrier)
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{}
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G4HETCNeutron::~G4HETCNeutron
()
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{}
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G4double
G4HETCNeutron::GetAlpha
()
const
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{
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return
0.76+2.2/
theResA13
;
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}
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G4double
G4HETCNeutron::GetBeta
()
const
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{
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return
(2.12/(
theResA13
*
theResA13
)-0.05)*
MeV
/
GetAlpha
();
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}
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G4double
G4HETCNeutron::GetSpinFactor
()
const
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{
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// (2s+1)
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return
2.0;
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}
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G4double
G4HETCNeutron::K
(
const
G4Fragment
& aFragment)
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{
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// Number of protons in emitted fragment
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G4int
Pa =
theZ
;
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// Number of neutrons in emitted fragment
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G4int
Na =
theA
- Pa;
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G4double
r
=
G4double
(
theResZ
)/
G4double
(
theResA
);
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G4int
P
= aFragment.
GetNumberOfParticles
();
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G4int
H
= aFragment.
GetNumberOfHoles
();
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G4double
result = 0.0;
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if
(P > 0)
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{
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result = (H + Na/(1.0-
r
))/
P
;
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}
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return
std::max
(0.0,result);
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}
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G4double
G4HETCNeutron::SampleKineticEnergy
(
const
G4Fragment
& aFragment)
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{
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G4int
H
= aFragment.
GetNumberOfHoles
();
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G4int
Pb = aFragment.
GetNumberOfParticles
();
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G4int
Nb = Pb + H;
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G4double
U = aFragment.
GetExcitationEnergy
();
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G4double
g0 = (6.0/
pi2
)*
fNucData
->
GetLevelDensity
(
theFragZ
,
theFragA
,U);
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G4double
Ab =
std::max
(0.0,
G4double
(Pb*Pb+H*H+Pb-3*H)/(4.0*g0));
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G4double
Emax
=
theMaxKinEnergy
- Ab;
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G4double
cut =
GetBeta
() / (
GetBeta
()+Emax/
G4double
(Nb+1));
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G4double
x
(0.0);
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if
(
G4UniformRand
() <= cut)
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{
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x =
BetaRand
(Nb,1);
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}
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else
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{
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x =
BetaRand
(Nb,2);
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}
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return
Emax * (1.0 -
x
);
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}
geant4
tree
geant4-10.6-release
source
processes
hadronic
models
pre_equilibrium
exciton_model
src
G4HETCNeutron.cc
Built by
Jin Huang
. updated:
Wed Jun 29 2022 17:25:49
using
1.8.2 with
ECCE GitHub integration