| Geant4 Cross Reference |
1 // 1 //
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26 // 26 //
27 // This software was developed by Lawrence Liv 27 // This software was developed by Lawrence Livermore National Laboratory.
28 // 28 //
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40 // THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``A 40 // THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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50 // 50 //
51 // Copyright (c) 2006 The Regents of the Unive 51 // Copyright (c) 2006 The Regents of the University of California.
52 // All rights reserved. 52 // All rights reserved.
53 // UCRL-CODE-224807 53 // UCRL-CODE-224807
54 // 54 //
55 // 55 //
56 // 56 //
57 57
58 #include <cmath> 58 #include <cmath>
59 #include "G4fissionEvent.hh" 59 #include "G4fissionEvent.hh"
60 60
61 G4double G4fissionEvent::G4SmpNVel(G4double en 61 G4double G4fissionEvent::G4SmpNVel(G4double eng, G4double* cosdiru, G4double* cosdirv, G4double* cosdirw) {
62 62
63 /* 63 /*
64 Description 64 Description
65 Knowing the neutron energy, determine its 65 Knowing the neutron energy, determine its velocity and the 3 direction cosines
66 */ 66 */
67 67
68 /* 68 /*
69 Input 69 Input
70 eng - energy of neutron 70 eng - energy of neutron
71 Output 71 Output
72 - velocity 72 - velocity
73 - 3 components of the neutron velo 73 - 3 components of the neutron velocity
74 in arguments (cosdiru, cosdirv, 74 in arguments (cosdiru, cosdirv, cosdirw)
75 */ 75 */
76 76
77 const G4double rme = 939.56563; /* Rest Mas 77 const G4double rme = 939.56563; /* Rest Mass Energy equivalents for neutrons (MeV) */
78 const G4double cspeed = 2.99792458e+8; /* s 78 const G4double cspeed = 2.99792458e+8; /* speed of light (m/sec) */
79 79
80 G4double vel; 80 G4double vel;
81 G4double ratio = eng/rme; 81 G4double ratio = eng/rme;
82 82
83 if (ratio > 1.e-8) { 83 if (ratio > 1.e-8) {
84 /* Relativistic vel calculation */ 84 /* Relativistic vel calculation */
85 vel = cspeed*std::sqrt(1.-rme*rme/((rme+ 85 vel = cspeed*std::sqrt(1.-rme*rme/((rme+eng)*(rme+eng)));
86 } else { 86 } else {
87 /* Non-relativistic vel calculation */ 87 /* Non-relativistic vel calculation */
88 vel = cspeed*std::sqrt(2.*eng/rme); 88 vel = cspeed*std::sqrt(2.*eng/rme);
89 } 89 }
90 90
91 G4SmpIsoDir(cosdiru, cosdirv, cosdirw); 91 G4SmpIsoDir(cosdiru, cosdirv, cosdirw);
92 92
93 return vel; 93 return vel;
94 } 94 }
95 95