Geant4 Cross Reference

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Geant4/processes/hadronic/models/fission/src/G4SmpNVel.cc

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Diff markup

Differences between /processes/hadronic/models/fission/src/G4SmpNVel.cc (Version 11.3.0) and /processes/hadronic/models/fission/src/G4SmpNVel.cc (Version 7.0)


  1 //                                                  1 
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  5 // * The  Geant4 software  is  copyright of th    
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 19 // * technical work of the GEANT4 collaboratio    
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 26 //                                                
 27 // This software was developed by Lawrence Liv    
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 51 // Copyright (c) 2006 The Regents of the Unive    
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 53 // UCRL-CODE-224807                               
 54 //                                                
 55 //                                                
 56 //                                                
 57                                                   
 58 #include <cmath>                                  
 59 #include "G4fissionEvent.hh"                      
 60                                                   
 61 G4double G4fissionEvent::G4SmpNVel(G4double en    
 62                                                   
 63 /*                                                
 64   Description                                     
 65     Knowing the neutron energy, determine its     
 66 */                                                
 67                                                   
 68 /*                                                
 69   Input                                           
 70     eng     - energy of neutron                   
 71   Output                                          
 72             - velocity                            
 73             - 3 components of the neutron velo    
 74               in arguments (cosdiru, cosdirv,     
 75 */                                                
 76                                                   
 77    const G4double rme = 939.56563; /* Rest Mas    
 78    const G4double cspeed = 2.99792458e+8; /* s    
 79                                                   
 80    G4double vel;                                  
 81    G4double ratio = eng/rme;                      
 82                                                   
 83    if (ratio > 1.e-8) {                           
 84 /*    Relativistic vel calculation */             
 85       vel = cspeed*std::sqrt(1.-rme*rme/((rme+    
 86    } else {                                       
 87 /*    Non-relativistic vel calculation */         
 88       vel = cspeed*std::sqrt(2.*eng/rme);         
 89    }                                              
 90                                                   
 91    G4SmpIsoDir(cosdiru, cosdirv, cosdirw);        
 92                                                   
 93    return vel;                                    
 94 }                                                 
 95