Geant4  10.02
G4SmpIsoDir.cc
Go to the documentation of this file.
1 //
2 // ********************************************************************
3 // * License and Disclaimer *
4 // * *
5 // * The Geant4 software is copyright of the Copyright Holders of *
6 // * the Geant4 Collaboration. It is provided under the terms and *
7 // * conditions of the Geant4 Software License, included in the file *
8 // * LICENSE and available at http://cern.ch/geant4/license . These *
9 // * include a list of copyright holders. *
10 // * *
11 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file LICENSE and URL above *
16 // * for the full disclaimer and the limitation of liability. *
17 // * *
18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboration. *
20 // * By using, copying, modifying or distributing the software (or *
21 // * any work based on the software) you agree to acknowledge its *
22 // * use in resulting scientific publications, and indicate your *
23 // * acceptance of all terms of the Geant4 Software license. *
24 // ********************************************************************
25 //
26 //
27 // This software was developed by Lawrence Livermore National Laboratory.
28 //
29 // Redistribution and use in source and binary forms, with or without
30 // modification, are permitted provided that the following conditions are met:
31 //
32 // 1. Redistributions of source code must retain the above copyright notice,
33 // this list of conditions and the following disclaimer.
34 // 2. Redistributions in binary form must reproduce the above copyright notice,
35 // this list of conditions and the following disclaimer in the documentation
36 // and/or other materials provided with the distribution.
37 // 3. The name of the author may not be used to endorse or promote products
38 // derived from this software without specific prior written permission.
39 //
40 // THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
41 // WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
42 // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
43 // EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
45 // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
46 // OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
47 // WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
48 // OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
49 // ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
50 //
51 // Copyright (c) 2006 The Regents of the University of California.
52 // All rights reserved.
53 // UCRL-CODE-224807
54 //
55 //
56 // $Id: G4SmpIsoDir.cc 67966 2013-03-13 09:38:38Z gcosmo $
57 //
58 
59 #include <cmath>
60 #include "G4fissionEvent.hh"
61 #include "G4Pow.hh"
62 #include "G4PhysicalConstants.hh"
63 
64 void G4fissionEvent::G4SmpIsoDir(G4double* cosdiru, G4double* cosdirv, G4double* cosdirw) {
65 
66 /*
67  Description
68  determine the 3 direction cosines of a particle emitted isotropically
69 */
70 
71 /*
72  Input
73  Output
74  - 3 components of the direction cosines
75  (cosdiru, cosdirv, cosdirw)
76 */
77 
78  G4double cospolang, sinpolang, phi;
79 
80 /*
81  Choose emission angle isotropically.
82  Select a polar angle direction cosine.
83 */
85  cospolang = 1.-2.*fisslibrng();
86  sinpolang = std::sqrt(1.-Pow->powA(cospolang, 2.));
87 /*
88  Select an azimuthal angle uniformly on (0,2*pi)
89 */
90  phi = twopi*fisslibrng();
91  *cosdiru = sinpolang * std::cos(phi);
92  *cosdirv = sinpolang * std::sin(phi);
93  *cosdirw = cospolang;
94 }
static G4Pow * GetInstance()
Definition: G4Pow.cc:55
G4double powA(G4double A, G4double y) const
Definition: G4Pow.hh:259
Definition: G4Pow.hh:56
static G4double fisslibrng(void)
Definition: G4rngc.cc:65
static const double twopi
Definition: G4SIunits.hh:75
void G4SmpIsoDir(G4double *cosdiru, G4double *cosdirv, G4double *cosdirw)
Definition: G4SmpIsoDir.cc:64
double G4double
Definition: G4Types.hh:76