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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 // $Id: G4SmpNVel.cc 67966 2013-03-13 09:38:38Z gcosmo $
56 // 57 //
57 58
58 #include <cmath> 59 #include <cmath>
59 #include "G4fissionEvent.hh" 60 #include "G4fissionEvent.hh"
60 61
61 G4double G4fissionEvent::G4SmpNVel(G4double en 62 G4double G4fissionEvent::G4SmpNVel(G4double eng, G4double* cosdiru, G4double* cosdirv, G4double* cosdirw) {
62 63
63 /* 64 /*
64 Description 65 Description
65 Knowing the neutron energy, determine its 66 Knowing the neutron energy, determine its velocity and the 3 direction cosines
66 */ 67 */
67 68
68 /* 69 /*
69 Input 70 Input
70 eng - energy of neutron 71 eng - energy of neutron
71 Output 72 Output
72 - velocity 73 - velocity
73 - 3 components of the neutron velo 74 - 3 components of the neutron velocity
74 in arguments (cosdiru, cosdirv, 75 in arguments (cosdiru, cosdirv, cosdirw)
75 */ 76 */
76 77
77 const G4double rme = 939.56563; /* Rest Mas 78 const G4double rme = 939.56563; /* Rest Mass Energy equivalents for neutrons (MeV) */
78 const G4double cspeed = 2.99792458e+8; /* s 79 const G4double cspeed = 2.99792458e+8; /* speed of light (m/sec) */
79 80
80 G4double vel; 81 G4double vel;
81 G4double ratio = eng/rme; 82 G4double ratio = eng/rme;
82 83
83 if (ratio > 1.e-8) { 84 if (ratio > 1.e-8) {
84 /* Relativistic vel calculation */ 85 /* Relativistic vel calculation */
85 vel = cspeed*std::sqrt(1.-rme*rme/((rme+ 86 vel = cspeed*std::sqrt(1.-rme*rme/((rme+eng)*(rme+eng)));
86 } else { 87 } else {
87 /* Non-relativistic vel calculation */ 88 /* Non-relativistic vel calculation */
88 vel = cspeed*std::sqrt(2.*eng/rme); 89 vel = cspeed*std::sqrt(2.*eng/rme);
89 } 90 }
90 91
91 G4SmpIsoDir(cosdiru, cosdirv, cosdirw); 92 G4SmpIsoDir(cosdiru, cosdirv, cosdirw);
92 93
93 return vel; 94 return vel;
94 } 95 }
95 96