Gabriele Cosmo
95 lines
4.1 KiB
C++
95 lines
4.1 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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// This software was developed by Lawrence Livermore National Laboratory.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// 3. The name of the author may not be used to endorse or promote products
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// derived from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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// EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// Copyright (c) 2006 The Regents of the University of California.
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// All rights reserved.
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// UCRL-CODE-224807
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//
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//
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// $Id: G4SmpIsoDir.cc 67966 2013-03-13 09:38:38Z gcosmo $
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//
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#include <cmath>
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#include "G4fissionEvent.hh"
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#include "G4Pow.hh"
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#include "G4PhysicalConstants.hh"
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void G4fissionEvent::G4SmpIsoDir(G4double* cosdiru, G4double* cosdirv, G4double* cosdirw) {
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/*
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Description
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determine the 3 direction cosines of a particle emitted isotropically
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*/
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/*
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Input
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Output
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- 3 components of the direction cosines
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(cosdiru, cosdirv, cosdirw)
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*/
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G4double cospolang, sinpolang, phi;
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/*
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Choose emission angle isotropically.
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Select a polar angle direction cosine.
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*/
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G4Pow* Pow=G4Pow::GetInstance();
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cospolang = 1.-2.*fisslibrng();
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sinpolang = std::sqrt(1.-Pow->powA(cospolang, 2.));
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/*
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Select an azimuthal angle uniformly on (0,2*pi)
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*/
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phi = twopi*fisslibrng();
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*cosdiru = sinpolang * std::cos(phi);
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*cosdirv = sinpolang * std::sin(phi);
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*cosdirw = cospolang;
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}
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