G4IonisParamElm.cc

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// 09-07-98, data moved from G4Element. M.Maire
// 22-11-00, tabulation of ionisation potential from
//           the ICRU Report N#37. V.Ivanchenko
// 08-03-01, correct handling of fShellCorrectionVector. M.Maire
// 17-10-02, Fix excitation energy interpolation. V.Ivanchenko
// 06-09-04, Update calculated values after any change of ionisation
//           potential change. V.Ivanchenko
// 29-04-10, Using G4Pow and mean ionisation energy from NIST V.Ivanchenko
// 27.10.11: new scheme for G4Exception  (mma)
 
#include "G4IonisParamElm.hh"
 
#include "G4NistManager.hh"
#include "G4PhysicalConstants.hh"
#include "G4Pow.hh"
#include "G4SystemOfUnits.hh"
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... ....oooOO0OOooo....
 
G4IonisParamElm::G4IonisParamElm(G4double AtomNumber)
{
  G4int Z = G4lrint(AtomNumber);
  if (Z < 1) {
    G4Exception("G4IonisParamElm::G4IonisParamElm()", "mat501", FatalException,
      "It is not allowed to create an Element with Z<1");
  }
  G4Pow* g4pow = G4Pow::GetInstance();
 
  // some basic functions of the atomic number
  fZ = Z;
  fZ3 = g4pow->Z13(Z);
  fZZ3 = fZ3 * g4pow->Z13(Z + 1);
  flogZ3 = g4pow->logZ(Z) / 3.;
 
  fMeanExcitationEnergy = G4NistManager::Instance()->GetMeanIonisationEnergy(Z);
 
  // compute parameters for ion transport
  // The aproximation from:
  // J.F.Ziegler, J.P. Biersack, U. Littmark
  // The Stopping and Range of Ions in Matter,
  // Vol.1, Pergamon Press, 1985
  // Fast ions or hadrons
 
  G4int iz = Z - 1;
  if (91 < iz) {
    iz = 91;
  }
 
  // clang-format off
  static const G4double vFermi[92] = {
    1.0309,  0.15976, 0.59782, 1.0781,  1.0486,  1.0,     1.058,   0.93942, 0.74562, 0.3424,
    0.45259, 0.71074, 0.90519, 0.97411, 0.97184, 0.89852, 0.70827, 0.39816, 0.36552, 0.62712,
    0.81707, 0.9943,  1.1423,  1.2381,  1.1222,  0.92705, 1.0047,  1.2,     1.0661,  0.97411,
    0.84912, 0.95,    1.0903,  1.0429,  0.49715, 0.37755, 0.35211, 0.57801, 0.77773, 1.0207,
    1.029,   1.2542,  1.122,   1.1241,  1.0882,  1.2709,  1.2542,  0.90094, 0.74093, 0.86054,
    0.93155, 1.0047,  0.55379, 0.43289, 0.32636, 0.5131,  0.695,   0.72591, 0.71202, 0.67413,
    0.71418, 0.71453, 0.5911,  0.70263, 0.68049, 0.68203, 0.68121, 0.68532, 0.68715, 0.61884,
    0.71801, 0.83048, 1.1222,  1.2381,  1.045,   1.0733,  1.0953,  1.2381,  1.2879,  0.78654,
    0.66401, 0.84912, 0.88433, 0.80746, 0.43357, 0.41923, 0.43638, 0.51464, 0.73087, 0.81065,
    1.9578,  1.0257} ;
 
  static const G4double lFactor[92] = {
    1.0,  1.0,  1.1,  1.06, 1.01, 1.03, 1.04, 0.99, 0.95, 0.9,
    0.82, 0.81, 0.83, 0.88, 1.0,  0.95, 0.97, 0.99, 0.98, 0.97,
    0.98, 0.97, 0.96, 0.93, 0.91, 0.9,  0.88, 0.9,  0.9,  0.9,
    0.9,  0.85, 0.9,  0.9,  0.91, 0.92, 0.9,  0.9,  0.9,  0.9,
    0.9,  0.88, 0.9,  0.88, 0.88, 0.9,  0.9,  0.88, 0.9,  0.9,
    0.9,  0.9,  0.96, 1.2,  0.9,  0.88, 0.88, 0.85, 0.9,  0.9,
    0.92, 0.95, 0.99, 1.03, 1.05, 1.07, 1.08, 1.1,  1.08, 1.08,
    1.08, 1.08, 1.09, 1.09, 1.1,  1.11, 1.12, 1.13, 1.14, 1.15,
    1.17, 1.2,  1.18, 1.17, 1.17, 1.16, 1.16, 1.16, 1.16, 1.16,
    1.16, 1.16} ;
  // clang-format on
 
  fVFermi = vFermi[iz];
  fLFactor = lFactor[iz];
 
  // obsolete parameters for ionisation
  fTau0 = 0.1 * fZ3 * MeV / proton_mass_c2;
  fTaul = 2. * MeV / proton_mass_c2;
 
  // compute the Bethe-Bloch formula for energy = fTaul*particle mass
  G4double rate = fMeanExcitationEnergy / electron_mass_c2;
  G4double w = fTaul * (fTaul + 2.);
  fBetheBlochLow = (fTaul + 1.) * (fTaul + 1.) * std::log(2. * w / rate) / w - 1.;
  fBetheBlochLow = 2. * fZ * twopi_mc2_rcl2 * fBetheBlochLow;
 
  fClow = std::sqrt(fTaul) * fBetheBlochLow;
  fAlow = 6.458040 * fClow / fTau0;
  G4double Taum = 0.035 * fZ3 * MeV / proton_mass_c2;
  fBlow = -3.229020 * fClow / (fTau0 * std::sqrt(Taum));
 
  // Shell correction parameterization
  fShellCorrectionVector = new G4double[3];  //[3]
  rate = 0.001 * fMeanExcitationEnergy / eV;
  G4double rate2 = rate * rate;
  fShellCorrectionVector[0] = (0.422377 + 3.858019 * rate) * rate2;
  fShellCorrectionVector[1] = (0.0304043 - 0.1667989 * rate) * rate2;
  fShellCorrectionVector[2] = (-0.00038106 + 0.00157955 * rate) * rate2;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... ....oooOO0OOooo....
 
G4IonisParamElm::~G4IonisParamElm() { delete[] fShellCorrectionVector; }