G4WilsonRadius.cc

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//
// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
//
// MODULE:              G4WilsonRadius.cc
//
// Version:     B.1
// Date:        15/04/04
// Author:      P R Truscott
// Organisation:    QinetiQ Ltd, UK
// Customer:        ESA/ESTEC, NOORDWIJK
// Contract:        17191/03/NL/LvH
//
// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
//
// CHANGE HISTORY
// --------------
//
// 6 October 2003, P R Truscott, QinetiQ Ltd, UK
// Created.
//
// 15 March 2004, P R Truscott, QinetiQ Ltd, UK
// Beta release
//
// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
//
//
#include "G4WilsonRadius.hh"
#include "G4SystemOfUnits.hh"

//
G4WilsonRadius::G4WilsonRadius ()
{
  G4double r0 = 0.84*fermi;
  r0sq        = r0 * r0;
  factor      = std::sqrt(5.0/3.0) * fermi;
  third       = 1.0 / 3.0;
}
//
G4WilsonRadius::~G4WilsonRadius ()
{;}
//
G4double G4WilsonRadius::GetWilsonRMSRadius (G4double A)
{
  G4double radius;
  if (A > 26.0)
    radius = factor * (0.84*std::pow(A,third) + 0.55);
  else
  {
    // this was changed from just G4double to static const G4double
    // to make sure that time wasn't being wasted on every call reloading a stack variable
    // by MHM 20050119
    static const G4double r[27] = {0.0, 0.85,  2.095, 1.976, 1.671, 1.986,
                           2.57,  2.41,  2.23,  2.519, 2.45,
                           2.42,  2.471, 2.440, 2.58,  2.611,
                           2.730, 2.662, 2.727, 2.9,   3.040,
                           2.867, 2.969, 2.94,  3.075, 3.11,
                           3.06};
    radius = factor * r[(G4int) (A+0.4)];
  }
  return radius;
}
//
G4double G4WilsonRadius::GetWilsonRadius (G4double A)
{
  G4double r  = GetWilsonRMSRadius(A);
  return  1.29*std::sqrt(r*r-r0sq);
}
//