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G4ParticleHPFissionSpectrum.hh
Go to the documentation of this file.
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the newest version in sPHENIX GitHub for file G4ParticleHPFissionSpectrum.hh
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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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// P. Arce, June-2014 Conversion neutron_hp to particle_hp
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//
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#ifndef G4ParticleHPFissionSpectrum_h
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#define G4ParticleHPFissionSpectrum_h 1
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#include <fstream>
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#include <
CLHEP/Units/SystemOfUnits.h
>
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#include "
globals.hh
"
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#include "
G4ios.hh
"
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#include "
Randomize.hh
"
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#include "
G4Exp.hh
"
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#include "
G4ParticleHPVector.hh
"
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#include "
G4VParticleHPEDis.hh
"
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// we will need a List of these .... one per term.
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class
G4ParticleHPFissionSpectrum
:
public
G4VParticleHPEDis
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{
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public
:
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G4ParticleHPFissionSpectrum
()
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{
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expm1
=
G4Exp
(-1.);
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}
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~G4ParticleHPFissionSpectrum
()
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{
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}
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inline
void
Init
(std::istream & aDataFile)
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{
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theFractionalProb
.
Init
(aDataFile,
CLHEP::eV
);
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theThetaDist
.
Init
(aDataFile,
CLHEP::eV
);
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}
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inline
G4double
GetFractionalProbability
(
G4double
anEnergy)
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{
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return
theFractionalProb
.
GetY
(anEnergy);
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}
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inline
G4double
Sample
(
G4double
anEnergy)
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{
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G4double
theta
=
theThetaDist
.
GetY
(anEnergy);
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// here we need to sample Maxwells distribution, if
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// need be.
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G4double
result, cut;
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G4double
range =50*
CLHEP::MeV
;
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G4double
max
=
Maxwell
((theta*
CLHEP::eV
)/2., theta);
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G4double
value
;
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G4int
icounter=0;
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G4int
icounter_max=1024;
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do
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{
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icounter++;
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if
( icounter > icounter_max ) {
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G4cout
<<
"Loop-counter exceeded the threshold value at "
<< __LINE__ <<
"th line of "
<< __FILE__ <<
"."
<<
G4endl
;
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break
;
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}
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result = range*
G4UniformRand
();
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value =
Maxwell
(result, theta);
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cut =
G4UniformRand
();
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}
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while
(cut > value/max);
// Loop checking, 11.05.2015, T. Koi
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return
result;
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}
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private
:
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// this is the function to sample from.
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inline
G4double
Maxwell
(
G4double
anEnergy,
G4double
theta
)
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{
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G4double
result = std::sqrt(anEnergy/
CLHEP::eV
)*
G4Exp
(-anEnergy/
CLHEP::eV
/theta);
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return
result;
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}
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private
:
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G4double
expm1
;
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G4ParticleHPVector
theFractionalProb
;
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G4ParticleHPVector
theThetaDist
;
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};
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#endif
geant4
tree
geant4-10.6-release
source
processes
hadronic
models
particle_hp
include
G4ParticleHPFissionSpectrum.hh
Built by
Jin Huang
. updated:
Wed Jun 29 2022 17:25:47
using
1.8.2 with
ECCE GitHub integration