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G4PreCompoundIon.cc
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26 // $Id: G4PreCompoundIon.cc 100378 2016-10-19 15:03:27Z gcosmo $
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28 // -------------------------------------------------------------------
29 //
30 // GEANT4 Class file
31 //
32 //
33 // File name: G4PreCompoundIon
34 //
35 // Author: V.Lara
36 //
37 // Modified:
38 // 10.02.2009 J. M. Quesada fixed bug in level density of light fragments
39 // 20.08.2010 V.Ivanchenko added G4Pow and G4PreCompoundParameters pointers
40 // use int Z and A and cleanup
41 //
42 
43 #include "G4PreCompoundIon.hh"
44 #include "G4PhysicalConstants.hh"
45 
46 G4PreCompoundIon::
47 G4PreCompoundIon(const G4ParticleDefinition* part,
48  G4VCoulombBarrier* aCoulombBarrier)
49  : G4PreCompoundFragment(part,aCoulombBarrier)
50 {
52  fact = 0.75*CLHEP::millibarn/(CLHEP::pi*r0*r0*r0);
53 }
54 
56 {}
57 
60  const G4Fragment& aFragment)
61 {
62  G4double efinal = eKin + theBindingEnergy;
63  if(efinal <= 0.0 ) { return 0.0; }
64 
65  G4double U = aFragment.GetExcitationEnergy();
66  G4int P = aFragment.GetNumberOfParticles();
67  G4int H = aFragment.GetNumberOfHoles();
68  G4int A = GetA();
69  G4int N = P + H;
70 
71  static const G4double sixoverpi2 = 6.0/CLHEP::pi2;
73  G4double g1 = sixoverpi2*theResA*theParameters->GetLevelDensity();
74 
75  G4double gj = g1;
76 
77  G4double A0 = G4double(P*P+H*H+P-3*H)/(4.0*g0);
78  G4double A1 = std::max(0.0,(A0*g0 + A*(A-2*P-1)*0.25)/g1);
79 
80  G4double E0 = U - A0;
81  if (E0 <= 0.0) { return 0.0; }
82 
83  G4double E1 = std::max(0.0,theMaxKinEnergy - eKin - A1);
84 
85  G4double Aj = A*(A+1)/(4.0*gj);
86  G4double Ej = std::max(0.0,efinal - Aj);
87 
88  G4double rj = GetRj(P, aFragment.GetNumberOfCharged());
89  G4double xs = CrossSection(eKin);
90 
91  G4double pA = fact*eKin*xs*rj
93  * std::sqrt(2.0/(theReducedMass*efinal))
94  * g4calc->powN(g1*E1/(g0*E0), N-A-1)
95  * g4calc->powN(gj*Ej/(g0*E0), A-1)*gj*g1/(g0*g0*E0*theResA);
96 
97  return pA;
98 }
99 
101 {
102  return -theCoulombBarrier;
103 }
G4double powN(G4double x, G4int n) const
Definition: G4Pow.cc:128
virtual ~G4PreCompoundIon()
static constexpr double pi2
Definition: SystemOfUnits.h:57
static constexpr double millibarn
Definition: SystemOfUnits.h:86
virtual G4double ProbabilityDistributionFunction(G4double eKin, const G4Fragment &aFragment)
G4int GetA() const
G4int GetNumberOfParticles() const
Definition: G4Fragment.hh:345
virtual G4double GetBeta() const
G4double GetLevelDensity() const
int G4int
Definition: G4Types.hh:78
static double P[]
G4DeexPrecoParameters * theParameters
G4int GetNumberOfHoles() const
Definition: G4Fragment.hh:365
double A(double temperature)
virtual G4double FactorialFactor(G4int N, G4int P) const =0
G4double CrossSection(G4double ekin) const
virtual G4double CoalescenceFactor(G4int A) const =0
virtual G4double GetRj(G4int NumberParticles, G4int NumberCharged) const =0
T max(const T t1, const T t2)
brief Return the largest of the two arguments
**D E S C R I P T I O N
Definition: HEPEvtcom.cc:77
double G4double
Definition: G4Types.hh:76
G4int GetNumberOfCharged() const
Definition: G4Fragment.hh:350
static constexpr double pi
Definition: SystemOfUnits.h:54
G4double GetExcitationEnergy() const
Definition: G4Fragment.hh:283