include/Geant4/G4INCLNDFGaussian.hh

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0025 //
0026 // INCL++ intra-nuclear cascade model
0027 // Alain Boudard, CEA-Saclay, France
0028 // Joseph Cugnon, University of Liege, Belgium
0029 // Jean-Christophe David, CEA-Saclay, France
0030 // Pekka Kaitaniemi, CEA-Saclay, France, and Helsinki Institute of Physics, Finland
0031 // Sylvie Leray, CEA-Saclay, France
0032 // Davide Mancusi, CEA-Saclay, France
0033 //
0034 #define INCLXX_IN_GEANT4_MODE 1
0035
0036 #include "globals.hh"
0037
0038 /** \file G4INCLNDFGaussian.hh
0039  * \brief Class for Gaussian density
0040  *
0041  * \date 16 July 2012
0042  * \author Davide Mancusi
0043  */
0044
0045 #ifndef G4INCLNDFGAUSSIAN_HH_
0046 #define G4INCLNDFGAUSSIAN_HH_
0047
0048 #include "G4INCLIFunction1D.hh"
0049 #include <cmath>
0050
0051 namespace G4INCL {
0052
0053   namespace NuclearDensityFunctions {
0054
0055     class GaussianRP : public IFunction1D {
0056       public:
0057         GaussianRP(G4double maximumRadius, G4double standardDeviation) :
0058           IFunction1D(0., maximumRadius),
0059           theStandardDeviation(standardDeviation)
0060       {}
0061
0062         inline G4double operator()(const G4double r) const {
0063           const G4double arg = std::pow((r/theStandardDeviation),2);
0064           return r*r*arg*std::exp(-arg/2.0);
0065         }
0066
0067       protected:
0068         G4double theStandardDeviation;
0069     };
0070
0071     class Gaussian : public IFunction1D {
0072       public:
0073         Gaussian(G4double maximumRadius, G4double standardDeviation) :
0074           IFunction1D(0., maximumRadius),
0075           theStandardDeviation(standardDeviation),
0076           normalisation(std::sqrt(2./Math::pi)/theStandardDeviation)
0077       {}
0078
0079         inline G4double operator()(const G4double r) const {
0080           const G4double arg = std::pow((r/theStandardDeviation),2);
0081           return normalisation * arg * std::exp(-arg/2.0);
0082         }
0083
0084       protected:
0085         G4double theStandardDeviation;
0086         const G4double normalisation;
0087     };
0088
0089   }
0090
0091 }
0092
0093 #endif // G4INCLNDFGAUSSIAN_HH_
0094