Gabriele Cosmo
223 lines
9.9 KiB
C++
223 lines
9.9 KiB
C++
// This code implementation is the intellectual property of
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// the RD44 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: G4NucleiProperties.cc,v 1.3 1999/05/26 14:05:17 larazb Exp $
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// GEANT4 tag $Name: geant4-00-01 $
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//
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//
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// ------------------------------------------------------------
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// GEANT 4 class header file
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//
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// For information related to this code contact:
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// CERN, IT Division, ASD group
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// ------------------------------------------------------------
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//
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// Hadronic Process: Nuclear De-excitations
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// by V. Lara (Oct 1998)
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// Migrate into particles category by H.Kurashige (17 Nov. 98)
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// Added Shell-Pairing corrections to the Cameron mass
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// excess formula by V.Lara (9 May 99)
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#include "G4NucleiProperties.hh"
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// G4double G4NucleiProperties::CameronMassExcess(const G4int A, const G4int Z)
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// {
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// const G4double alpha = -17.0354*MeV;
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// const G4double beta = -31.4506*MeV;
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// const G4double phi = 44.2355*MeV;
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// const G4double gamma = 25.8357*MeV;
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//
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// const G4double A13 = pow(G4double(A),1.0/3.0);
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// const G4double A23 = A13*A13;
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// const G4double A43 = A23*A23;
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// const G4double Z43 = pow(G4double(Z),4.0/3.0);
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// G4double D = (G4double(A) - 2.0*G4double(Z))/G4double(A);
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// D *= D; // D = pow((A-2Z)/A,2)
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//
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//
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// // Surface term
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// G4double SurfaceEnergy = (gamma - phi*D)*(1.0 - 0.62025/A23)*(1.0 - 0.62025/A23)*A23;
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//
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// // Coulomb term
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// G4double CoulombEnergy = 0.779*MeV*(G4double(Z*(Z-1))/A13)*(1.0-1.5849/A23+1.2273/A+1.5772/A43);
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//
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// // Exchange term
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// G4double ExchangeEnergy = -0.4323*MeV*(Z43/A13)*(1.0-0.57811/A13-0.14518/A23+0.49597/A);
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//
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// // Volume term
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// G4double VolumeEnergy = G4double(A)*(alpha-beta*D);
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//
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// // Shell+Pairing corrections for protons
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// G4double SPcorrectionZ;
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// if (Z <= TableSize) SPcorrectionZ = SPZTable[Z-1]*MeV;
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// else SPcorrectionZ = 0.0;
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//
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// // Shell+Pairing corrections for protons
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// G4int N = A - Z;
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// G4double SPcorrectionN;
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// if (N <= TableSize) SPcorrectionN = SPNTable[N-1]*MeV;
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// else SPcorrectionN = 0.0;
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//
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//
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// // Mass Excess
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// // First two terms give the mass excess of the neutrons and protons in the nucleus
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// // (see Cameron, Canadian Journal of Physics, 35, 1957 page 1022)
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// G4double MassExcess = 8.367*MeV*A - 0.783*MeV*Z +
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// SurfaceEnergy + CoulombEnergy + ExchangeEnergy + VolumeEnergy +
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// SPcorrectionZ + SPcorrectionN;
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//
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// return MassExcess;
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// }
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G4double G4NucleiProperties::AtomicMass(G4double Z, G4double A)
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{
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// derived from original FORTRAN code ATOMAS by H. Fesefeldt (2-Dec-1986)
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//
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// Computes atomic mass in MeV
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// units for A example: A = material->GetA()/(g/mole);
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//
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// Note: can't just use aEff and zEff since the Nuclear Reaction
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// function needs to calculate atomic mass for various values of A and Z
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G4ParticleDefinition* proton = G4ParticleTable::GetParticleTable()->FindParticle("proton");
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G4ParticleDefinition* neutron = G4ParticleTable::GetParticleTable()->FindParticle("neutron");
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G4ParticleDefinition* electron = G4ParticleTable::GetParticleTable()->FindParticle("e-");
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if ((proton == 0)||(neutron == 0)||(electron == 0)) {
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G4Exception("G4NucleiProperties::AtomicMass G4Proton or G4Neutron is not defined !!");
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}
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const G4double proton_mass = proton->GetPDGMass();
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const G4double neutron_mass = neutron->GetPDGMass();
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const G4double electron_mass = electron->GetPDGMass();
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//
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// Weitzsaecker's Mass formula
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//
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G4int nNeutron = A-Z;
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G4int ipp = G4int(nNeutron)%2; // pairing
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G4int izz = G4int(Z)%2;
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G4double mass =
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nNeutron*neutron_mass + Z*proton_mass
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- 15.67*double(A) // nuclear volume
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+ 17.23*pow(double(A),2./3.) // surface energy
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+ 93.15*(double(A/2.-Z)*double(A/2.-Z))/double(A) // asymmetry
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+ 0.6984523*double(Z*Z)*pow(double(A),-1./3.) // coulomb
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+ Z*electron_mass; // electrons mass
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if( ipp == izz ) mass += (ipp+izz-1) * 12.0 / sqrt(double(A)); // pairing
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return mass*MeV;
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}
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G4double G4NucleiProperties::BindingEnergy(G4double A, G4double Z)
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{
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//
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// Weitzsaecker's Mass formula
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//
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G4int nNeutron = A-Z;
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G4int ipp = G4int(nNeutron)%2; // pairing
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G4int izz = G4int(Z)%2;
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G4double binding =
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- 15.67*A // nuclear volume
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+ 17.23*pow(A,2./3.) // surface energy
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+ 93.15*((A/2.-Z)*(A/2.-Z))/A // asymmetry
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+ 0.6984523*Z*Z*pow(A,-1./3.); // coulomb
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if( ipp == izz ) binding += (ipp+izz-1) * 12.0 / sqrt(A); // pairing
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return -binding*MeV;
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}
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G4double G4NucleiProperties::GetNuclearMass(const G4double A, const G4double Z)
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{
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if (A < 1 || Z < 0 || Z > A) {
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G4cout << "G4NucleiProperties::GetNuclearMass: Wrong values for A = " << A
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<< " and Z = " << Z << endl;
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return 0.0;
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} else {
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G4ParticleDefinition * nucleus = 0;
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if ( (Z<=2) ) {
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if ( (Z==1)&&(A==1) ) {
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nucleus = G4ParticleTable::GetParticleTable()->FindParticle("proton"); // proton
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} else if ( (Z==0)&&(A==1) ) {
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nucleus = G4ParticleTable::GetParticleTable()->FindParticle("neutron"); // neutron
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} else if ( (Z==1)&&(A==2) ) {
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nucleus = G4ParticleTable::GetParticleTable()->FindParticle("deuteron"); // deuteron
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} else if ( (Z==1)&&(A==3) ) {
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nucleus = G4ParticleTable::GetParticleTable()->FindParticle("triton"); // tritoon
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} else if ( (Z==2)&&(A==4) ) {
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nucleus = G4ParticleTable::GetParticleTable()->FindParticle("alpha"); // alpha
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} else if ( (Z==2)&&(A==3) ) {
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nucleus = G4ParticleTable::GetParticleTable()->FindParticle("He3"); // He3
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}
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}
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if (nucleus!=0) {
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return nucleus->GetPDGMass();
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}else {
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G4double bindingEnergy = GetBindingEnergy(A,Z);
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G4double protonMass = G4ParticleTable::GetParticleTable()->FindParticle("proton")->GetPDGMass();
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G4double neutronMass = G4ParticleTable::GetParticleTable()->FindParticle("neutron")->GetPDGMass();
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return Z*protonMass + (A-Z)*neutronMass - bindingEnergy;
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}
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}
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}
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// S(Z)+P(Z) from Tab. 1 from A.G.W. Cameron, Canad. J. Phys., 35(1957)1021
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// or Delta M(Z) from Tab. 97 of book [1]
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// const G4double G4NucleiProperties::SPZTable[TableSize] = {
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// 20.80, 15.80, 21.00, 16.80, 19.80, 16.50, 18.80, 16.50, 18.50, 17.20, // 1 - 10
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// 18.26, 15.05, 16.01, 12.04, 13.27, 11.09, 12.17, 10.26, 11.04, 8.41, // 11 - 20
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// 9.79, 7.36, 8.15, 5.63, 5.88, 3.17, 3.32, .82, 1.83, .97, // 21 - 30
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// 2.33, 1.27, 2.92, 1.61, 2.91, 1.35, 2.40, .89, 1.74, .36, // 31
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// 0.95, -0.65, -0.04, -1.73, -0.96, -2.87, -2.05, -4.05, -3.40, -5.72, // 41
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// -3.75, -4.13, -2.42, -2.85, -1.01, -1.33, 0.54, -0.02, 1.74, 0.75, // 51
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// 2.24, 1.00, 1.98, 0.79, 1.54, 0.39, 1.08, 0.00, 0.78, -0.35, // 61
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// 0.58, -0.55, 0.59, -0.61, 0.59, -0.35, 0.32, -0.96, -0.52, -2.08, // 71
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// -2.46, -3.64, -1.55, -0.96, 0.97, 0.88, 2.37, 1.75, 2.72, 1.90, // 81
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// 2.55, 1.46, 1.93, 0.86, 1.17, 0.08, 0.39, -0.76, -0.39, -1.51, // 91 - 100
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// -1.17, -2.36, -1.95, -3.06, -2.62, -3.55, -2.95, -3.75, -3.07, -3.79, // 101 - 110
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// -3.06, -3.77, -3.05, -3.78, -3.12, -3.90, -3.35, -4.24, -3.86, -4.92, // 111 - 120
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// -5.06, -6.77, -7.41, -9.18,-10.16,-11.12, -9.76, -9.23, -7.96, -7.65, // 121 - 130
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// // --------- from this point there are not tabulated values -----------------------
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// 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, // 131 - 140
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// 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, // 141 - 150
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// 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, // 151
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// 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, // 161
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// 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, // 171
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// 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, // 181
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// 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00 // 191 - 200
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// };
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// S(N)+P(N) from Tab. 1 from A.G.W. Cameron, Canad. J. Phys., 35(1957)1021
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// or Delta M(N) from Tab. 97 of book [1]
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// const G4double G4NucleiProperties::SPNTable[TableSize] = {
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// -8.40,-12.90, -8.00, 11.90, -9.20,-12.50,-10.80,-13.60,-11.20,-12.20, // 1 - 10
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// -12.81,-15.40,-13.07,-15.80,-13.81,-14.98,-12.63,-13.76,-11.37,-12.38, // 11 - 20
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// -9.23, -9.65, -7.64, -9.17, -8.05, -9.72, -8.87,-10.76, -8.64, -8.89, // 21 - 30
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// -6.60, -7.13, -4.77, -5.33, -3.06, -3.79, -1.72, -2.79, -0.93, -2.19, // 31
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// -0.52, -1.90, -0.45, -2.20, -1.22, -3.07, -2.42, -4.37, -3.94, -6.08, // 41
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// -4.49, -4.50, -3.14, -2.93, -1.04, -1.36, 0.69, 0.21, 2.11, 1.33, // 51
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// 3.29, 2.46, 4.30, 3.32, 4.79, 3.62, 4.97, 3.64, 4.63, 3.07, // 61
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// 4.06, 2.49, 3.30, 1.46, 2.06, 0.51, 0.74, -1.18, -1.26, -3.54, // 71
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// -3.97, -5.26, -4.18, -3.71, -2.10, -1.70, -0.08, -0.18, 0.94, 0.27, // 81
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// 1.13, 0.08, 0.91, -0.31, 0.49, -0.78, 0.08, -1.15, -0.23, -1.41, // 91 - 100
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// -0.42, -1.55, -0.55, -1.66, -0.66, -1.73, -0.75, -1.74, -0.78, -1.69, // 101 - 110
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// -0.78, -1.60, -0.75, -1.46, -0.67, -1.26, -0.51, -1.04, -0.53, -1.84, // 111 - 120
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// -2.42, -4.52, -4.76, -6.33, -6.76, -7.81, -5.80, -5.37, -3.63, -3.35, // 121 - 130
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// -1.75, -1.88, -0.61, -0.90, 0.09, -0.32, 0.55, -0.13, 0.70, -0.06, // 131 - 140
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// 0.49, -0.20, 0.40, -0.22, 0.36, -0.09, 0.58, 0.12, 0.75, 0.15, // 141 - 150
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// 0.70, 0.17, 1.11, 0.89, 1.85, 1.62, 2.54, 2.29, 3.20, 2.91, // 151
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// 3.84, 3.53, 4.48, 4.15, 5.12, 4.78, 5.75, 5.39, 6.31, 5.91, // 161
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// 6.87, 6.33, 7.13, 6.61, 7.30, 6.31, 6.27, 4.83, 4.49, 2.85, // 171
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// 2.32, 0.58, -0.11, -0.98, 0.81, 1.77, 3.37, 4.13, 5.60, 6.15, // 181
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// 7.29, 7.35, 7.95, 7.67, 8.16, 7.83, 8.31, 8.01, 8.53, 8.27 // 191 - 200
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// };
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