Gabriele Cosmo
59 lines
2.6 KiB
C++
59 lines
2.6 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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// neutron_hp -- source file
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// J.P. Wellisch, Nov-1996
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// A prototype of the low energy neutron transport model.
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// P. Arce, June-2014 Conversion neutron_hp to particle_hp
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//
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#include "G4ParticleHPWattSpectrum.hh"
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#include "G4SystemOfUnits.hh"
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G4double G4ParticleHPWattSpectrum::Sample(G4double anEnergy)
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{
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G4double a = theApar.GetY(anEnergy) * eV;
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G4double b = theBpar.GetY(anEnergy) / eV;
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G4double result = 0.;
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G4double random, cut, max;
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max = std::sinh(std::sqrt(b * 15. * a));
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G4int icounter = 0;
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G4int icounter_max = 1024;
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do {
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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 "
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<< __FILE__ << "." << G4endl;
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break;
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}
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random = G4UniformRand();
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result = -a * G4Log(random);
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cut = G4UniformRand();
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} while (cut > std::sinh(std::sqrt(b * result)) / max); // Loop checking, 11.05.2015, T. Koi
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return result;
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}
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