Gabriele Cosmo
95 lines
3.6 KiB
C++
95 lines
3.6 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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//
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// GEANT4 Class file
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//
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//
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// File name: G4WentzelVIRelXSection
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//
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// Author: V.Ivanchenko
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//
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// Creation date: 08.06.2012 from G4WentzelOKandVIxSection
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//
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// Modifications:
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//
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//
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// -------------------------------------------------------------------
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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 "G4WentzelVIRelXSection.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4WentzelVIRelXSection::G4WentzelVIRelXSection() = default;
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4WentzelVIRelXSection::~G4WentzelVIRelXSection() = default;
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4WentzelVIRelXSection::SetupKinematic(G4double kinEnergy,
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const G4Material* mat)
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{
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if(kinEnergy != tkin || mat != currentMaterial) {
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currentMaterial = mat;
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tkin = kinEnergy;
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G4double momLab2 = tkin*(tkin + 2.0*mass);
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G4double etot = tkin + mass;
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G4double ptot = std::sqrt(momLab2);
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G4double m12 = mass*mass;
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// relativistic reduced mass from publucation
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// A.P. Martynenko, R.N. Faustov, Teoret. mat. Fiz. 64 (1985) 179
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//incident particle & target nucleus
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G4double Ecm = std::sqrt(m12 + targetMass*targetMass + 2.0*etot*targetMass);
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G4double mu_rel = mass*targetMass/Ecm;
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G4double momCM = ptot*targetMass/Ecm;
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// relative system
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mom2 = momCM*momCM;
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invbeta2 = 1.0 + mu_rel*mu_rel/mom2;
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factB = spin/invbeta2;
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factD = std::sqrt(mom2)/targetMass;
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cosTetMaxNuc = isCombined ?
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std::max(cosThetaMax, 1.-factorA2*mat->GetIonisation()->GetInvA23()/mom2)
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: cosThetaMax;
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}
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return cosTetMaxNuc;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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