Gabriele Cosmo
193 lines
6.2 KiB
C++
193 lines
6.2 KiB
C++
//
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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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// GEANT4 Class file
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//
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// For information related to this code contact:
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//
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// File name: G4XnpTotalLowE
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//
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// Author:
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//
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// Creation date: 15 April 1999
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//
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// Modifications:
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//
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// Neutron-Proton total cross section
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// Linear interpolation from data table
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//
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// -------------------------------------------------------------------
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#include "globals.hh"
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#include "G4ios.hh"
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#include "G4Exp.hh"
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#include "G4Log.hh"
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#include "G4SystemOfUnits.hh"
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#include "G4XnpTotalLowE.hh"
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#include "G4KineticTrack.hh"
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#include "G4ParticleDefinition.hh"
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#include "G4PhysicsVector.hh"
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#include "G4PhysicsLnVector.hh"
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#include "G4Proton.hh"
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#include "G4Neutron.hh"
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const G4double G4XnpTotalLowE::_lowLimit = 0.;
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const G4double G4XnpTotalLowE::_highLimit = 3.*GeV;
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// Low energy limit of the cross-section table (in GeV)
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// Units are assigned when filling the PhysicsVector
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const G4double G4XnpTotalLowE::_eMinTable = 1.8964808;
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const G4double G4XnpTotalLowE::_eStepLog = 0.01;
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// Cross-sections in mb
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// Units are assigned when filling the PhysicsVector
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const G4int G4XnpTotalLowE::_tableSize = 101;
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const G4double G4XnpTotalLowE::_sigmaTable[101] =
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{
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1500.0,
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248.20, 93.38, 55.26, 44.50, 41.33, 38.48, 37.20, 35.98,
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35.02, 34.47, 34.37, 34.67, 35.23, 35.97, 36.75, 37.37,
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37.77, 38.03, 38.40, 38.83, 39.26, 39.67, 40.06, 40.45,
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40.79, 41.06, 41.31, 41.52, 41.70, 41.81, 41.87, 41.98,
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42.12, 42.29, 42.55, 42.82, 43.01, 43.12, 43.16, 43.14,
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43.06, 42.95, 42.81, 42.67, 42.54, 42.45, 42.38, 42.33,
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42.30, 42.29, 42.28, 42.26, 42.24, 42.21, 42.17, 42.14,
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42.10, 42.07, 42.06, 42.05, 42.04, 42.03, 42.02, 42.00,
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41.97, 41.94, 41.89, 41.84, 41.79, 41.73, 41.67, 41.61,
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41.55, 41.49, 41.44, 41.38, 41.34, 41.31, 41.29, 41.28,
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41.27, 41.28, 41.30, 41.33, 41.36, 41.40, 41.44, 41.49,
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41.50, 41.51, 41.51, 41.51, 41.52, 41.51, 41.51, 41.50,
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41.50, 41.49, 41.47, 41.46
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};
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G4XnpTotalLowE::G4XnpTotalLowE()
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{
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// Cross-sections are available in the range (_eMin,_eMax)
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_eMin = _eMinTable * GeV;
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_eMin = G4Exp(G4Log(_eMinTable)-_eStepLog)*GeV;
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_eMax = G4Exp(G4Log(_eMinTable) + _tableSize * _eStepLog) * GeV;
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// Protections: validity limits must be compatible with available data
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// @@GF this ought to be _lowLimit < _eMin
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if (_eMin < _lowLimit)
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throw G4HadronicException(__FILE__, __LINE__, "G4XnpTotalLowE::G4XnpTotalLowE - Low energy limit not valid");
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if (_highLimit > _eMax)
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throw G4HadronicException(__FILE__, __LINE__, "G4XnpTotalLowE::G4XnpTotalLowE - High energy limit not valid");
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_sigma = new G4PhysicsLnVector(_eMin,_eMax,_tableSize);
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G4int i;
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for (i=0; i<_tableSize; i++)
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{
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G4double value = _sigmaTable[i] * millibarn;
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_sigma->PutValue(i,value);
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}
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}
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G4XnpTotalLowE::~G4XnpTotalLowE()
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{
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if (_sigma) delete _sigma;
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_sigma=0;
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}
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G4bool G4XnpTotalLowE::operator==(const G4XnpTotalLowE &right) const
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{
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return (this == (G4XnpTotalLowE *) &right);
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}
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G4bool G4XnpTotalLowE::operator!=(const G4XnpTotalLowE &right) const
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{
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return (this != (G4XnpTotalLowE *) &right);
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}
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G4double G4XnpTotalLowE::CrossSection(const G4KineticTrack& trk1, const G4KineticTrack& trk2) const
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{
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G4double sigma = 0.;
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G4double sqrtS = (trk1.Get4Momentum() + trk2.Get4Momentum()).mag();
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G4bool dummy = false;
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const G4ParticleDefinition* proton = G4Proton::ProtonDefinition();
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const G4ParticleDefinition* neutron = G4Neutron::NeutronDefinition();
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const G4ParticleDefinition* def1 = trk1.GetDefinition();
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const G4ParticleDefinition* def2 = trk2.GetDefinition();
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if ( (def1 == proton && def2 == neutron) ||
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(def1 == neutron && def2 == proton) )
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{
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if (sqrtS >= _eMin && sqrtS <= _eMax)
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{
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sigma = _sigma->GetValue(sqrtS,dummy);
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} else if ( sqrtS < _eMin )
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{
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sigma = _sigma->GetValue(_eMin,dummy);
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}
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}
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return sigma;
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}
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void G4XnpTotalLowE::Print() const
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{
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// Dump the cross-section table
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G4cout << Name() << "Cross-section table: " << G4endl;
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G4bool dummy = false;
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G4int i;
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for (i=0; i<_tableSize; i++)
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{
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G4double e = _sigma->GetLowEdgeEnergy(i) / GeV;
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G4double sigma = _sigma->GetValue(e,dummy) / millibarn;
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G4cout << i << ") e = " << e << " GeV ---- Cross section = " << sigma << " mb " << G4endl;
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}
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G4VCrossSectionSource::Print();
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}
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G4String G4XnpTotalLowE::Name() const
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{
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G4String name("NNTotalLowE");
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return name;
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}
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G4bool G4XnpTotalLowE::IsValid(G4double e) const
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{
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G4bool answer = InLimits(e,_lowLimit,_highLimit);
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return answer;
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}
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