Gabriele Cosmo
150 lines
5.5 KiB
C++
150 lines
5.5 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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/// \file field/field06/src/F06PrimaryGeneratorAction.cc
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/// \brief Implementation of the F06PrimaryGeneratorAction class
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//
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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#include "F06PrimaryGeneratorAction.hh"
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#include "F06DetectorConstruction.hh"
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#include "G4Event.hh"
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#include "G4ParticleDefinition.hh"
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#include "G4ParticleGun.hh"
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#include "G4ParticleTable.hh"
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#include "G4PhysicalConstants.hh"
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#include "G4SystemOfUnits.hh"
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#include "Randomize.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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F06PrimaryGeneratorAction::F06PrimaryGeneratorAction()
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{
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G4int n_particle = 1;
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fParticleGun = new G4ParticleGun(n_particle);
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G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
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G4ParticleDefinition* particle = particleTable->FindParticle("proton");
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G4double mass_proton = particle->GetPDGMass();
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G4double muN = 0.5 * CLHEP::eplus * CLHEP::hbar_Planck / (mass_proton / CLHEP::c_squared);
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G4cout << " *** Neutron *** " << G4endl;
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particle = particleTable->FindParticle("neutron");
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G4double mass_neutron = particle->GetPDGMass();
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G4double magneticMoment = particle->GetPDGMagneticMoment();
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G4cout << " magneticMoment: " << magneticMoment / muN << G4endl;
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// g_factor for spin 1/2
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G4double g_factor = 2 * magneticMoment / muN;
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G4cout << " g_factor: " << g_factor << G4endl;
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G4double charge = particle->GetPDGCharge();
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G4cout << " charge: " << charge << G4endl;
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G4double anomaly = (g_factor - 2.) / 2.;
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G4cout << " anomaly: " << anomaly << G4endl;
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anomaly = (g_factor * (mass_neutron / mass_proton) - 2.) / 2.;
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G4cout << " corrected anomaly: " << anomaly << G4endl;
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muN = 0.5 * CLHEP::eplus * CLHEP::hbar_Planck / (mass_neutron / CLHEP::c_squared);
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g_factor = 2 * magneticMoment / muN;
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anomaly = (g_factor - 2.) / 2.;
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G4cout << " *** anomaly: " << anomaly << G4endl;
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G4cout << " *** MuonPlus *** " << G4endl;
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particle = particleTable->FindParticle("mu+");
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G4double mass_muon = particle->GetPDGMass();
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G4double muB = 0.5 * CLHEP::eplus * CLHEP::hbar_Planck / (mass_muon / CLHEP::c_squared);
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magneticMoment = particle->GetPDGMagneticMoment();
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G4cout << " magneticMoment: " << magneticMoment / muB << G4endl;
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// g_factor for spin 1/2
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g_factor = magneticMoment / muB;
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G4cout << " g_factor: " << g_factor << G4endl;
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charge = particle->GetPDGCharge();
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G4cout << " charge: " << charge << G4endl;
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anomaly = (g_factor - 2.) / 2.;
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G4cout << " anomaly: " << anomaly << G4endl;
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// anomaly = particle->CalculateAnomaly();
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// G4cout << " *** anomaly: " << anomaly << G4endl;
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particle = particleTable->FindParticle("neutron");
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fParticleGun->SetParticleDefinition(particle);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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F06PrimaryGeneratorAction::~F06PrimaryGeneratorAction()
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{
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delete fParticleGun;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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void F06PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
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{
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// this function is called at the begining of event
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//
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fParticleGun->SetParticlePosition(G4ThreeVector(0.0, 0.0, 0.0));
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fParticleGun->SetParticlePolarization(G4ThreeVector(0, 1, 0));
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G4double particleEnergy = G4UniformRand() * 1e-7 * eV;
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fParticleGun->SetParticleEnergy(particleEnergy);
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G4double theta = 2 * pi * G4UniformRand();
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G4double phi = std::acos(1 - 2 * G4UniformRand());
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if (phi > pi / 2 && phi < pi) phi = pi - phi;
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G4double z = std::sin(phi) * std::cos(theta);
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G4double x = std::sin(phi) * std::sin(theta);
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G4double y = std::cos(phi);
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fParticleGun->SetParticleMomentumDirection(G4ThreeVector(x, y, z));
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fParticleGun->GeneratePrimaryVertex(anEvent);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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