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G4PairingCorrection.cc
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25 //
26 // $Id$
27 //
28 // Hadronic Process: Nuclear De-excitations
29 // by V. Lara
30 
31 #include "G4PairingCorrection.hh"
32 #include "G4SystemOfUnits.hh"
33 
34 G4PairingCorrection* G4PairingCorrection::theInstance = 0;
35 
36 G4PairingCorrection::G4PairingCorrection()
37 {
38  theCookPairingCorrections = G4CookPairingCorrections::GetInstance();
39  theCameronGilbertPairingCorrections = G4CameronGilbertPairingCorrections::GetInstance();
40 // theCameronTruranHilfPairingCorrections = G4CameronTruranHilfPairingCorrections::GetInstance();
41 }
42 
44 {;}
45 
47 {
48  if (!theInstance) {
49  static G4PairingCorrection theCorrections;
50  theInstance = &theCorrections;
51  }
52  return theInstance;
53 }
54 
56 {
57  G4double PCorrection = 0.0;
58  G4int N = A - Z;
59  if (theCookPairingCorrections->IsInTableThisN(N) &&
60  theCookPairingCorrections->IsInTableThisZ(Z))
61  PCorrection = theCookPairingCorrections->GetParingCorrection(A,Z);
62  else if (theCameronGilbertPairingCorrections->IsInTableThisN(N) &&
63  theCameronGilbertPairingCorrections->IsInTableThisZ(Z))
64  PCorrection = theCameronGilbertPairingCorrections->GetPairingCorrection(A,Z);
65  else {
66  const G4double PairingConstant = 12.0*MeV;
67  G4double Pair = (1 - Z + 2*(Z/2)) + (1 - N + 2*(N/2));
68  PCorrection = Pair*PairingConstant/std::sqrt(static_cast<G4double>(A));
69  }
70  return std::max(PCorrection,0.0);
71 }
72 
73 
75 {
76  const G4double PairingConstant = 14.0*MeV;
77  G4int N = A - Z;
78  G4double Pair = (1 - Z + 2*(Z/2)) + (1 - N + 2*(N/2));
79  G4double PCorrection = Pair*PairingConstant/std::sqrt(static_cast<G4double>(A));
80  return PCorrection;
81 }