G4FermiNucleiProperties.cc

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//
// G4FermiBreakUpAN alternative FermiBreakUp model
// by A. Novikov (January 2025)
//
 
#include "G4FermiNucleiProperties.hh"
 
#include <G4BaryonConstructor.hh>
#include <G4NucleiProperties.hh>
#include <G4PhysicalConstants.hh>
 
namespace
{
std::size_t GetSlot(G4FermiAtomicMass atomicMass, G4FermiChargeNumber chargeNumber)
{
  const auto mass = static_cast<std::uint32_t>(atomicMass);
  const auto charge = static_cast<std::uint32_t>(chargeNumber);
  return (mass * (mass + 1)) / 2 + charge;
}
}  // namespace
 
G4FermiNucleiProperties::G4FermiNucleiProperties()
{
  for (auto a = 1; a < MAX_A; ++a) {
    for (auto z = 0; z <= a; ++z) {
      const auto atomicMass = G4FermiAtomicMass(a);
      const auto chargeNumber = G4FermiChargeNumber(z);
 
      const auto mass = G4NucleiProperties::GetNuclearMass(a, z);
      if (mass > 0.) {
        InsertNuclei(atomicMass, chargeNumber, mass, G4NucleiProperties::IsInStableTable(a, z));
      }
    }
  }
}
 
G4double G4FermiNucleiProperties::GetNuclearMassImpl(G4FermiAtomicMass atomicMass,
                                                     G4FermiChargeNumber chargeNumber) const
{
  FERMI_ASSERT_MSG(static_cast<std::uint32_t>(atomicMass)
                     >= static_cast<std::uint32_t>(chargeNumber),
                   "invalid nuclei A = " << atomicMass << ", Z = " << chargeNumber);
 
  const auto slot = GetSlot(atomicMass, chargeNumber);
  if (slot < nucleiMasses_.size() && nucleiMasses_[slot].isCached) {
    return nucleiMasses_[slot].mass;
  }
 
  return G4NucleiProperties::GetNuclearMass(G4int(atomicMass), G4int(chargeNumber));
}
 
G4bool G4FermiNucleiProperties::IsStableImpl(G4FermiAtomicMass atomicMass,
                                             G4FermiChargeNumber chargeNumber) const
{
  if (atomicMass < 1_m || chargeNumber < 0_c
      || static_cast<std::uint32_t>(chargeNumber)
      > static_cast<std::uint32_t>(atomicMass))
  {
    return false;
  }
 
  const auto slot = GetSlot(atomicMass, chargeNumber);
 
  return slot < nucleiMasses_.size() && nucleiMasses_[slot].isStable;
}
 
void G4FermiNucleiProperties::InsertNuclei(G4FermiAtomicMass atomicMass,
                                           G4FermiChargeNumber chargeNumber, G4double mass,
                                           G4bool isStable)
{
  const auto slot = GetSlot(atomicMass, chargeNumber);
  if (slot >= nucleiMasses_.size()) {
    nucleiMasses_.resize(slot + static_cast<std::uint32_t>(atomicMass));
  }
 
  nucleiMasses_[slot] = G4FermiMassData{
    mass,  // mass
    isStable,  // isStable
    true,  // isCached
  };
}