Gabriele Cosmo
57 lines
1.3 KiB
C++
57 lines
1.3 KiB
C++
// This code implementation is the intellectual property of
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// the GEANT4 collaboration.
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//
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// By copying, distributing or modifying the Program (or any work
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// based on the Program) you indicate your acceptance of this statement,
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// and all its terms.
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//
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// $Id: G4FermiMomentum.hh,v 1.2 1999/12/15 14:52:50 gunter Exp $
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// GEANT4 tag $Name: geant4-03-00 $
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//
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#ifndef G4FermiMomentum_h
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#define G4FermiMomentum_h 1
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#include "globals.hh"
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#include "G4ThreeVector.hh"
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#include "Randomize.hh"
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class G4FermiMomentum
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{
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public:
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G4FermiMomentum();
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~G4FermiMomentum();
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inline void Init(G4double anA, G4double aZ) {theA = anA; theZ = aZ;}
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inline G4double GetFermiMomentum(G4double density)
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{
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return constofpmax * cbrt(density * theA);
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}
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inline G4ThreeVector GetMomentum(G4double density)
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{
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G4ThreeVector p;
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do {
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p=G4ThreeVector(2.*G4UniformRand()-1.,
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2.*G4UniformRand()-1.,
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2.*G4UniformRand()-1.);
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} while ( p.mag() > 1. );
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return p*GetFermiMomentum(density);
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}
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private:
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G4double theA;
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G4double theZ;
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// pmax= hbar * c * ( 3* pi**2 * rho )**(1/3) =
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// hbar * c * ( 3* pi**2 )**(1/3) * rho**(1/3)=
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// constofpmax * rho**(1/3)
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G4double constofpmax;
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};
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#endif
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