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NeutronPhysics.cc
Go to the documentation of this file.
Or view
the newest version in sPHENIX GitHub for file NeutronPhysics.cc
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// $Id: $
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// //
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// File: NeutronPhysics.cc //
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// Description: Neutron hadronic physics constructor for EICPhysicsList //
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// //
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// Author: Dennis H. Wright (SLAC) //
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// Date: 3 July 2018 //
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// //
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#include "
NeutronPhysics.hh
"
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#include <Geant4/G4ProcessManager.hh>
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#include <Geant4/G4NeutronInelasticProcess.hh>
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#include <Geant4/G4HadronElasticProcess.hh>
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#include <Geant4/G4HadronCaptureProcess.hh>
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#include <Geant4/G4NeutronKiller.hh>
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#include <Geant4/G4CascadeInterface.hh>
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#include <Geant4/G4TheoFSGenerator.hh>
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#include <Geant4/G4FTFModel.hh>
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#include <Geant4/G4ExcitedStringDecay.hh>
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#include <Geant4/G4LundStringFragmentation.hh>
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#include <Geant4/G4GeneratorPrecompoundInterface.hh>
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#include <Geant4/G4ChipsElasticModel.hh>
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#include <Geant4/G4NeutronRadCapture.hh>
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#include <Geant4/G4BGGNucleonInelasticXS.hh>
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#include <Geant4/G4NeutronElasticXS.hh>
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#include <Geant4/G4NeutronCaptureXS.hh>
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#include <Geant4/G4SystemOfUnits.hh>
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NeutronPhysics::NeutronPhysics
():
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ftfp(nullptr),
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stringModel(nullptr),
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stringDecay(nullptr),
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fragModel(nullptr),
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preCompoundModel(nullptr)
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{}
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NeutronPhysics::~NeutronPhysics
()
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{
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delete
stringDecay
;
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delete
stringModel
;
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delete
fragModel
;
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delete
preCompoundModel
;
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}
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void
NeutronPhysics::ConstructParticle
()
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{}
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void
NeutronPhysics::ConstructProcess
()
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{
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// Low energy elastic model
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G4ChipsElasticModel
* elMod =
new
G4ChipsElasticModel
();
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// Use Bertini cascade for low energies
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G4CascadeInterface
* loInelModel =
new
G4CascadeInterface
;
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loInelModel->
SetMinEnergy
(0.0);
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loInelModel->
SetMaxEnergy
(12.0*
GeV
);
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// Capture model
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G4NeutronRadCapture
* capModel =
new
G4NeutronRadCapture
();
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// Use FTFP for high energies ==>> eventually replace this with new class FTFPInterface
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ftfp
=
new
G4TheoFSGenerator
(
"FTFP"
);
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stringModel
=
new
G4FTFModel
;
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stringDecay
=
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new
G4ExcitedStringDecay
(
fragModel
=
new
G4LundStringFragmentation
);
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stringModel
->
SetFragmentationModel
(
stringDecay
);
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preCompoundModel
=
new
G4GeneratorPrecompoundInterface
();
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ftfp
->
SetHighEnergyGenerator
(
stringModel
);
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ftfp
->
SetTransport
(
preCompoundModel
);
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ftfp
->
SetMinEnergy
(5*
GeV
);
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ftfp
->
SetMaxEnergy
(100*
TeV
);
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// Cross section sets
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G4BGGNucleonInelasticXS
* inelCS =
new
G4BGGNucleonInelasticXS
(
G4Neutron::Neutron
() );
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G4NeutronElasticXS
* elCS =
new
G4NeutronElasticXS
;
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G4NeutronCaptureXS
* capCS =
new
G4NeutronCaptureXS
;
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G4ProcessManager
* procMan =
G4Neutron::Neutron
()->
GetProcessManager
();
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// Elastic process
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G4HadronElasticProcess
* nProcEl =
new
G4HadronElasticProcess
;
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nProcEl->
RegisterMe
(elMod);
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nProcEl->
AddDataSet
(elCS);
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procMan->
AddDiscreteProcess
(nProcEl);
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// Inelastic process
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G4NeutronInelasticProcess
* nProcInel =
new
G4NeutronInelasticProcess
;
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nProcInel->
RegisterMe
(loInelModel);
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nProcInel->
RegisterMe
(
ftfp
);
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nProcInel->
AddDataSet
(inelCS);
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procMan->
AddDiscreteProcess
(nProcInel);
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// Capture process
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G4HadronCaptureProcess
* nProcCap =
new
G4HadronCaptureProcess
(
"nCapture"
);
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nProcCap->
RegisterMe
(capModel);
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nProcCap->
AddDataSet
(capCS);
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procMan->
AddDiscreteProcess
(nProcCap);
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// Neutron cut (kill neutrons that live too long or have too little energy)
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G4NeutronKiller
* nKiller =
new
G4NeutronKiller
();
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nKiller->
SetKinEnergyLimit
(0.0*
MeV
);
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nKiller->
SetTimeLimit
(10.*
microsecond
);
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procMan->
AddDiscreteProcess
(nKiller);
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}
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