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G4VPreCompoundFragment.cc
Go to the documentation of this file. Or view the newest version in sPHENIX GitHub for file G4VPreCompoundFragment.cc
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25 //
26 //
27 // J. M. Quesada (August 2008). Based on previous work by V. Lara
28 //
29 // Modified:
30 // 20.08.2010 V.Ivanchenko added G4Pow and G4PreCompoundParameters pointers
31 // use int Z and A and cleanup
32 
33 #include "G4VPreCompoundFragment.hh"
34 #include "G4SystemOfUnits.hh"
35 #include "G4NucleiProperties.hh"
36 #include "G4NuclearLevelData.hh"
37 #include "G4DeexPrecoParameters.hh"
38 
39 G4VPreCompoundFragment::G4VPreCompoundFragment(
40  const G4ParticleDefinition* part, G4VCoulombBarrier* aCoulombBarrier)
41  : particle(part), theCoulombBarrierPtr(aCoulombBarrier),
42  theMomentum(0.,0.,0.,0.),
43  theA(particle->GetBaryonNumber()),
44  theZ(G4lrint(particle->GetPDGCharge())),
45  theResA(0),theResZ(0),theFragA(0),theFragZ(0),theBindingEnergy(0.0),
46  theMinKinEnergy(0.0),theMaxKinEnergy(0.0),theResMass(0.0),
47  theReducedMass(0.0),
48  theEmissionProbability(0.0),theCoulombBarrier(0.0),
49  OPTxs(3),useSICB(true)
50 {
51  theMass = particle->GetPDGMass();
52  fNucData = G4NuclearLevelData::GetInstance();
53  theParameters = fNucData->GetParameters();
54  g4calc = G4Pow::GetInstance();
55  theResA13 = 0.0;
56 }
57 
58 G4VPreCompoundFragment::~G4VPreCompoundFragment()
59 {}
60 
61 std::ostream&
62 operator << (std::ostream &out, const G4VPreCompoundFragment &theFragment)
63 {
64  out << &theFragment;
65  return out;
66 }
67 
68 std::ostream&
69 operator << (std::ostream &out, const G4VPreCompoundFragment *theFragment)
70 {
71  out
72  << "PreCompoundModel Emitted Fragment: Z= " << theFragment->GetZ()
73  << " A= " << theFragment->GetA()
74  << " Mass(GeV)= " << theFragment->GetNuclearMass()/CLHEP::GeV;
75  return out;
76 }
77 
78 void
79 G4VPreCompoundFragment::Initialize(const G4Fragment & aFragment)
80 {
81  theFragA = aFragment.GetA_asInt();
82  theFragZ = aFragment.GetZ_asInt();
83  theResA = theFragA - theA;
84  theResZ = theFragZ - theZ;
85 
86  theMinKinEnergy = theMaxKinEnergy = theCoulombBarrier = 0.0;
87  if ((theResA < theResZ) || (theResA < theA) || (theResZ < theZ)) {
88  return;
89  }
90 
91  theResA13 = g4calc->Z13(theResA);
92  theCoulombBarrier = theCoulombBarrierPtr->
93  GetCoulombBarrier(theResA,theResZ,aFragment.GetExcitationEnergy());
94 
95  G4double elim = (0 == OPTxs) ? theCoulombBarrier : theCoulombBarrier*0.5;
96 
97  // Calculate masses
98  theResMass = G4NucleiProperties::GetNuclearMass(theResA, theResZ);
99  theReducedMass = theResMass*theMass/(theResMass + theMass);
100 
101  // Compute Binding Energies for fragments
102  // needed to separate a fragment from the nucleus
103  theBindingEnergy = theResMass + theMass - aFragment.GetGroundStateMass();
104 
105  // Compute Maximal Kinetic Energy which can be carried by fragments
106  // after separation - the true assimptotic value
107  G4double Ecm = aFragment.GetMomentum().m();
108  G4double twoEcm = Ecm + Ecm;
109  theMaxKinEnergy = std::max(((Ecm-theResMass)*(Ecm+theResMass) + theMass*theMass)
110  /twoEcm - theMass,0.0);
111  theMinKinEnergy = (elim == 0.0) ? 0.0 :
112  std::max(((theMass+elim)*(twoEcm-theMass-elim) +
113  theMass*theMass)/twoEcm - theMass,0.0);
114 }