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CexmcGenbod.cc
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26 /*
27  * =============================================================================
28  *
29  * Filename: CexmcGenbod.cc
30  *
31  * Description: original fortran routine GENBOD wrapper
32  *
33  * Version: 1.0
34  * Created: 08.09.2010 14:36:23
35  * Revision: none
36  * Compiler: gcc
37  *
38  * Author: Alexey Radkov (),
39  * Company: PNPI
40  *
41  * =============================================================================
42  */
43 
44 #ifdef CEXMC_USE_GENBOD
45 
46 #include <G4SystemOfUnits.hh>
47 #include "CexmcGenbod.hh"
48 #include "CexmcException.hh"
49 
50 
51 extern "C"
52 {
53  extern int genbod_( void );
54 }
55 
56 
57 extern struct genbod_in_data
58 {
59  int np;
60  float tecm;
61  float amass[ 18 ];
62  int kgenev;
63 } genin_;
64 
65 
66 extern struct genbod_out_data
67 {
68  float pcm[ 18 ][ 5 ];
69  float wt;
70 } genout_;
71 
72 
73 CexmcGenbod::CexmcGenbod()
74 {
75  genin_.np = 0;
76  genin_.kgenev = 1;
77 }
78 
79 
80 G4bool CexmcGenbod::CheckKinematics( void )
81 {
82  totalEnergy = 0.;
83  for ( CexmcPhaseSpaceInVector::const_iterator k( inVec.begin() );
84  k != inVec.end(); ++k )
85  {
86  totalEnergy += ( *k )->e();
87  }
88 
89  /* epsilon is needed to compensate float to fortran real cast accuracy,
90  * the value 3E-6 was found experimentally, maybe has to be made bigger,
91  * but not smaller */
92  const float epsilon( 3E-6 );
93 
94  return totalEnergy - totalMass > 0.0f + epsilon;
95 }
96 
97 
98 G4double CexmcGenbod::Generate( void )
99 {
100  genin_.tecm = totalEnergy / GeV;
101 
102  genbod_();
103 
104  float ( *pcm )[ 5 ]( &genout_.pcm[ 0 ] );
105 
106  for ( CexmcPhaseSpaceOutVector::iterator k( outVec.begin() );
107  k != outVec.end(); ++k )
108  {
109  k->lVec->setPx( ( *pcm )[ 0 ] * GeV );
110  k->lVec->setPy( ( *pcm )[ 1 ] * GeV );
111  k->lVec->setPz( ( *pcm )[ 2 ] * GeV );
112  k->lVec->setE( ( *pcm++ )[ 3 ] * GeV );
113  }
114 
115  return genout_.wt;
116 }
117 
118 
119 void CexmcGenbod::ParticleChangeHook( void )
120 {
121  size_t nmbOfOutputParticles( outVec.size() );
122 
123  if ( nmbOfOutputParticles < 2 || nmbOfOutputParticles > 18 )
125 
126  genin_.np = nmbOfOutputParticles;
127 
128  float * amass( genin_.amass );
129 
130  for ( CexmcPhaseSpaceOutVector::const_iterator k( outVec.begin() );
131  k != outVec.end(); ++k )
132  {
133  *amass++ = k->mass / GeV;
134  }
135 }
136 
137 
138 void CexmcGenbod::FermiEnergyDepStatusChangeHook( void )
139 {
140  genin_.kgenev = fermiEnergyDepIsOn ? 2 : 1;
141 }
142 
143 #endif
144 
bool G4bool
Definition: G4Types.hh:79
static constexpr double GeV
Definition: G4SIunits.hh:217
double G4double
Definition: G4Types.hh:76
double epsilon(double density, double temperature)