115 lines
3.6 KiB
C++
115 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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// 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: G4XAqmElastic
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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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// Additive Quark Model Elastic cross section
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// (H.J. Lipkin and F. Scheck, Phys.Rev. 16 (1966) 71
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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 "G4Pow.hh"
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#include "G4XAqmElastic.hh"
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#include "G4XAqmTotal.hh"
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#include "G4KineticTrack.hh"
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// Validity range of this cross-section
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const G4double G4XAqmElastic::_lowLimit = 0.;
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const G4double G4XAqmElastic::_highLimit = DBL_MAX;
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G4XAqmElastic::G4XAqmElastic()
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{
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// As a first approximation the model is assumed to be valid over
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// the entire energy range
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}
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G4XAqmElastic::~G4XAqmElastic()
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{ }
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G4bool G4XAqmElastic::operator==(const G4XAqmElastic &right) const
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{
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return (this == (G4XAqmElastic *) &right);
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}
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G4bool G4XAqmElastic::operator!=(const G4XAqmElastic &right) const
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{
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return (this != (G4XAqmElastic *) &right);
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}
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G4double G4XAqmElastic::CrossSection(const G4KineticTrack& trk1, const G4KineticTrack& trk2) const
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{
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G4double sigma = 0.;
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// Reference to be checked!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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static const G4double coeff = 0.39;
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static const G4double param = 1.5;
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G4XAqmTotal aqmTotal;
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G4double sigmaTot = aqmTotal.CrossSection(trk1,trk2);
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sigma = coeff * G4Pow::GetInstance()->powA(sigmaTot,param);
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// Verify that elastic cross section < total cross section
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if (sigma > sigmaTot)
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throw G4HadronicException(__FILE__, __LINE__, "G4XAqmElastic::CrossSection - elastic cross section greater than total");
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return sigma;
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}
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G4String G4XAqmElastic::Name() const
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{
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G4String name("AqmElasticCrossSection");
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return name;
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}
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G4bool G4XAqmElastic::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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