Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/processes/hadronic/util/include/G4FermiMomentum.hh

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  1 //
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 27 //
 28 #ifndef G4FermiMomentum_h
 29 #define G4FermiMomentum_h 1
 30 
 31 #include "globals.hh"
 32 #include "G4ThreeVector.hh"
 33 #include "Randomize.hh"
 34 #include "G4Pow.hh"
 35 
 36 class G4FermiMomentum 
 37 {
 38 
 39   public:
 40     G4FermiMomentum();
 41     ~G4FermiMomentum();
 42     
 43     inline void Init(G4int anA, G4int aZ) {theA = anA; theZ = aZ;}
 44     
 45     inline G4double GetFermiMomentum(G4double density)
 46     {
 47   return constofpmax * cbrt(density * theA);
 48     }
 49     
 50     inline G4ThreeVector GetMomentum(G4double density, 
 51                  G4double maxMomentum=-1.)
 52     { 
 53   if (maxMomentum < 0 ) maxMomentum=GetFermiMomentum(density);
 54   G4ThreeVector p;
 55   
 56   do {
 57       p=G4ThreeVector(2.*G4UniformRand()-1.,
 58               2.*G4UniformRand()-1.,
 59               2.*G4UniformRand()-1.);
 60       } while ( p.mag() > 1. );  /* Loop checking, 30-Oct-2015, G.Folger */
 61   return p*maxMomentum; 
 62      }
 63 
 64   private:
 65 
 66   G4double cbrt(G4double x) { return G4Pow::GetInstance()->A13(x); }
 67 
 68   private:
 69   
 70     G4int theA;
 71     G4int theZ;
 72       // pmax= hbar * c * ( 3* pi**2 * rho )**(1/3) =
 73       //       hbar * c * ( 3* pi**2 )**(1/3) * rho**(1/3)=
 74       //       constofpmax * rho**(1/3)
 75     G4double constofpmax;
 76   
 77 };
 78 
 79 #endif
 80 
 81