G4ParticleHPKallbachMannSyst Class Reference

#include <G4ParticleHPKallbachMannSyst.hh>

Public Member Functions
	G4ParticleHPKallbachMannSyst (G4double aCompoundFraction, G4double anIncidentEnergy, G4double anIncidentMass, G4double aProductEnergy, G4double aProductMass, G4double aResidualMass, G4int aResidualA, G4int aResidualZ, G4double aTargetMass, G4int aTargetA, G4int aTargetZ, G4int aProjectileA, G4int aProjectileZ, G4int aProductA, G4int aProductZ)
	~G4ParticleHPKallbachMannSyst ()=default
G4double	Sample (G4double anEnergy)
G4double	Kallbach (G4double cosTh, G4double anEnergy)
G4double	GetKallbachZero (G4double anEnergy)
G4double	A (G4double anEnergy)
G4double	SeparationEnergy (G4int Ac, G4int Nc, G4int AA, G4int ZA, G4int Abinding, G4int Zbinding)

Detailed Description

Definition at line 36 of file G4ParticleHPKallbachMannSyst.hh.

Constructor & Destructor Documentation

G4ParticleHPKallbachMannSyst()

G4ParticleHPKallbachMannSyst::G4ParticleHPKallbachMannSyst ( G4double aCompoundFraction, G4double anIncidentEnergy, G4double anIncidentMass, G4double aProductEnergy, G4double aProductMass, G4double aResidualMass, G4int aResidualA, G4int aResidualZ, G4double aTargetMass, G4int aTargetA, G4int aTargetZ, G4int aProjectileA, G4int aProjectileZ, G4int aProductA, G4int aProductZ )

inline

Definition at line 39 of file G4ParticleHPKallbachMannSyst.hh.

    {
      theCompoundFraction = aCompoundFraction;
      theIncidentEnergy = anIncidentEnergy;
      theIncidentMass = anIncidentMass;
      theProductEnergy = aProductEnergy;
      theProductMass = aProductMass;
      theResidualMass = aResidualMass;
      theResidualA = aResidualA;
      theResidualZ = aResidualZ;
      theTargetMass = aTargetMass;
      theTargetA = aTargetA;
      theTargetZ = aTargetZ;
      theProjectileA = aProjectileA;
      theProjectileZ = aProjectileZ;
      theProductA = aProductA;
      theProductZ = aProductZ;
    }

~G4ParticleHPKallbachMannSyst()

G4ParticleHPKallbachMannSyst::~G4ParticleHPKallbachMannSyst ( )

default

Member Function Documentation

A()

G4double G4ParticleHPKallbachMannSyst::A

(

G4double

anEnergy

)

Definition at line 100 of file G4ParticleHPKallbachMannSyst.cc.

{
  G4double result;
  G4double C1 = 0.04 / MeV;
  G4double C2 = 1.8E-6 / (MeV * MeV * MeV);
  G4double C3 = 6.7E-7 / (MeV * MeV * MeV * MeV);
 
  G4double epsa = anEnergy * theTargetMass / (theTargetMass + theIncidentMass);
  G4int Ac = theTargetA + theProjectileA;
  G4int Nc = Ac - theTargetZ - theProjectileZ;
  G4int AA = theTargetA;
  G4int ZA = theTargetZ;
  G4double ea = epsa + SeparationEnergy(Ac, Nc, AA, ZA, theProjectileA, theProjectileZ);
  G4double Et1 = 130 * MeV;
  G4double R1 = std::min(ea, Et1);
  // theProductEnergy is still in CMS!!!
  G4double epsb = theProductEnergy * (theProductMass + theResidualMass) / theResidualMass;
  G4int AB = theResidualA;
  G4int ZB = theResidualZ;
  G4double eb = epsb + SeparationEnergy(Ac, Nc, AB, ZB, theProductA, theProductZ);
  G4double X1 = R1 * eb / ea;
  G4double Et3 = 41 * MeV;
  G4double R3 = std::min(ea, Et3);
  G4double X3 = R3 * eb / ea;
 
  G4double Ma = 1;
  G4double mb = 1;
  if (theProjectileA == 1 || (theProjectileZ == 1 && theProjectileA == 2)) {
    Ma = 1;
  }  // neutron,proton,deuteron
  else if (theProjectileA == 4 && theProjectileZ == 2) {
    Ma = 0;
  }  // alpha
  else if (theProjectileA == 3 && (theProjectileZ == 1 || theProjectileZ == 2)) {
    Ma = 0.5;
  }  // tritum,He3 : set intermediate value
  else {
    throw G4HadronicException(__FILE__, __LINE__,
                              "Severe error in the sampling of Kallbach-Mann Systematics");
  }
  if (theProductA == 1 && theProductZ == 0) {
    mb = 1. / 2.;
  }  // neutron
  else if (theProductA == 4 && theProductZ == 2) {
    mb = 2;
  }  // alpha
  else {
    mb = 1;
  }
 
  result = C1 * X1 + C2 * G4Pow::GetInstance()->powN(X1, 3)
           + C3 * Ma * mb * G4Pow::GetInstance()->powN(X3, 4);
  return result;
}

GetKallbachZero()

G4double G4ParticleHPKallbachMannSyst::GetKallbachZero

(

G4double

anEnergy

)

Definition at line 86 of file G4ParticleHPKallbachMannSyst.cc.

{
  G4double result;
  // delta 2.0e-16 in not good.
  // delta 4.0e-16 is OK
  // safety factor of 2
  G4double delta = 8.0e-16;
  if (std::abs(theCompoundFraction - 1) < delta) {
    theCompoundFraction = 1.0 - delta;
  }
  result = 0.5 * (1. / A(anEnergy)) * G4Log((1 - theCompoundFraction) / (1 + theCompoundFraction));
  return result;
}

Referenced by Sample().

Kallbach()

G4double G4ParticleHPKallbachMannSyst::Kallbach	(	G4double	cosTh,
		G4double	anEnergy )

Definition at line 76 of file G4ParticleHPKallbachMannSyst.cc.

{
  // Kallbach-Mann systematics without normalization.
  G4double result;
  G4double theX = A(anEnergy) * cosTh;
  result =
    0.5 * (G4Exp(theX) * (1 + theCompoundFraction) + G4Exp(-theX) * (1 - theCompoundFraction));
  return result;
}

Referenced by Sample().

Sample()

G4double G4ParticleHPKallbachMannSyst::Sample

(

G4double

anEnergy

)

Definition at line 45 of file G4ParticleHPKallbachMannSyst.cc.

{
  G4double result = 0.;
 
  G4double zero = GetKallbachZero(anEnergy);
  if (zero > 1) zero = 1.;
  if (zero < -1) zero = -1.;
  G4double max = Kallbach(zero, anEnergy);
  G4double upper = Kallbach(1., anEnergy);
  G4double lower = Kallbach(-1., anEnergy);
  if (upper > max) max = upper;
  if (lower > max) max = lower;
  G4double value, random;
 
  G4int icounter = 0;
  G4int icounter_max = 1024;
  do {
    icounter++;
    if (icounter > icounter_max) {
      G4cout << "Loop-counter exceeded the threshold value at " << __LINE__ << "th line of "
             << __FILE__ << "." << G4endl;
      break;
    }
    result = 2. * G4UniformRand() - 1;
    value = Kallbach(result, anEnergy) / max;
    random = G4UniformRand();
  } while (random > value);  // Loop checking, 11.05.2015, T. Koi
 
  return result;
}

Referenced by G4ParticleHPContAngularPar::Sample().

SeparationEnergy()

G4double G4ParticleHPKallbachMannSyst::SeparationEnergy	(	G4int	Ac,
		G4int	Nc,
		G4int	AA,
		G4int	ZA,
		G4int	Abinding,
		G4int	Zbinding )

Definition at line 155 of file G4ParticleHPKallbachMannSyst.cc.

{
  G4double result;
  G4int NA = AA - ZA;
  G4int Zc = Ac - Nc;
  result = 15.68 * (Ac - AA);
  result += -28.07 * ((Nc - Zc) * (Nc - Zc) / (G4double)Ac - (NA - ZA) * (NA - ZA) / (G4double)AA);
  result +=
    -18.56 * (G4Pow::GetInstance()->A23(G4double(Ac)) - G4Pow::GetInstance()->A23(G4double(AA)));
  result += 33.22
            * ((Nc - Zc) * (Nc - Zc) / G4Pow::GetInstance()->powA(G4double(Ac), 4. / 3.)
               - (NA - ZA) * (NA - ZA) / G4Pow::GetInstance()->powA(G4double(AA), 4. / 3.));
  result += -0.717
            * (Zc * Zc / G4Pow::GetInstance()->A13(G4double(Ac))
               - ZA * ZA / G4Pow::GetInstance()->A13(G4double(AA)));
  result += 1.211 * (Zc * Zc / (G4double)Ac - ZA * ZA / (G4double)AA);
  G4double totalBinding(0);
  if (Zbinding == 0 && Abinding == 1) totalBinding = 0;
  if (Zbinding == 1 && Abinding == 1) totalBinding = 0;
  if (Zbinding == 1 && Abinding == 2) totalBinding = 2.224596;
  if (Zbinding == 1 && Abinding == 3) totalBinding = 8.481798;
  if (Zbinding == 2 && Abinding == 3) totalBinding = 7.718043;
  if (Zbinding == 2 && Abinding == 4) totalBinding = 28.29566;
  result += -totalBinding;
  result *= MeV;
  return result;
}

Referenced by A().

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The documentation for this class was generated from the following files:

• G4ParticleHPKallbachMannSyst.hh
• G4ParticleHPKallbachMannSyst.cc