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25 //
26 //
27 //
28 // Hadronic Process: Nuclear De-excitations
29 // by V. Lara
30 //
31 // Modified:
32 // 25.07.08 I.Pshenichnov (in collaboration with Alexander Botvina and Igor
33 // Mishustin (FIAS, Frankfurt, INR, Moscow and Kurchatov Institute,
34 // Moscow, pshenich@fias.uni-frankfurt.de) fixed computation of the
35 // symmetry energy
36
37 #include "G4StatMFMacroMultiNucleon.hh"
38 #include "G4PhysicalConstants.hh"
39 #include "G4SystemOfUnits.hh"
40 #include "G4Log.hh"
41 #include "G4Exp.hh"
42 #include "G4Pow.hh"
43
44 // Default constructor
45 G4StatMFMacroMultiNucleon::
46 G4StatMFMacroMultiNucleon() :
47 G4VStatMFMacroCluster(0) // Beacuse the def. constr. of base class is private
48 {
49 throw G4HadronicException(__FILE__, __LINE__, "G4StatMFMacroMultiNucleon::default_constructor meant to not be accessible");
50 }
51
52 // Copy constructor
53 G4StatMFMacroMultiNucleon::
54 G4StatMFMacroMultiNucleon(const G4StatMFMacroMultiNucleon & ) :
55 G4VStatMFMacroCluster(0) // Beacuse the def. constr. of base class is private
56 {
57 throw G4HadronicException(__FILE__, __LINE__, "G4StatMFMacroMultiNucleon::copy_constructor meant to not be accessible");
58 }
59
60 // Operators
61
62 G4StatMFMacroMultiNucleon & G4StatMFMacroMultiNucleon::
63 operator=(const G4StatMFMacroMultiNucleon & )
64 {
65 throw G4HadronicException(__FILE__, __LINE__, "G4StatMFMacroMultiNucleon::operator= meant to not be accessible");
66 return *this;
67 }
68
69 G4bool G4StatMFMacroMultiNucleon::operator==(const G4StatMFMacroMultiNucleon & ) const
70 {
71 throw G4HadronicException(__FILE__, __LINE__, "G4StatMFMacroMultiNucleon::operator== meant to not be accessible");
72 return false;
73 }
74
75 G4bool G4StatMFMacroMultiNucleon::operator!=(const G4StatMFMacroMultiNucleon & ) const
76 {
77 throw G4HadronicException(__FILE__, __LINE__, "G4StatMFMacroMultiNucleon::operator!= meant to not be accessible");
78 return true;
79 }
80
81 G4double G4StatMFMacroMultiNucleon::CalcMeanMultiplicity(const G4double FreeVol,
82 const G4double mu,
83 const G4double nu,
84 const G4double T)
85 {
86 G4double ThermalWaveLenght = 16.15*fermi/std::sqrt(T);
87 G4double lambda3 = ThermalWaveLenght*ThermalWaveLenght*ThermalWaveLenght;
88 G4Pow* g4calc = G4Pow::GetInstance();
89 G4double A23 = g4calc->Z23(theA);
90
91 G4double exponent = (mu + nu*theZARatio+ G4StatMFParameters::GetE0()
92 + T*T/_InvLevelDensity
93 - G4StatMFParameters::GetGamma0()*(1.0 - 2.0*theZARatio)*
94 (1.0 - 2.0*theZARatio))*theA
95 - G4StatMFParameters::Beta(T)*A23
96 - G4StatMFParameters::GetCoulomb()*theZARatio*theZARatio*A23*theA;
97
98 exponent /= T;
99
100 if (exponent > 30.0) exponent = 30.0;
101
102 _MeanMultiplicity = std::max((FreeVol * theA * std::sqrt((G4double)theA)/lambda3) *
103 G4Exp(exponent),1.0e-30);
104 return _MeanMultiplicity;
105 }
106
107 G4double G4StatMFMacroMultiNucleon::CalcZARatio(const G4double nu)
108 {
109 G4double den = 8*G4StatMFParameters::GetGamma0()
110 + 2*G4StatMFParameters::GetCoulomb()*G4Pow::GetInstance()->Z23(theA);
111 theZARatio = (4.0*G4StatMFParameters::GetGamma0()+nu)/den;
112 return theZARatio;
113 }
114
115 G4double G4StatMFMacroMultiNucleon::CalcEnergy(const G4double T)
116 {
117 G4Pow* g4calc = G4Pow::GetInstance();
118 G4double A23 = g4calc->Z23(theA);
119
120 // Volume term
121 G4double EVol = theA * (T*T/_InvLevelDensity - G4StatMFParameters::GetE0());
122
123 // Symmetry term
124 G4double ESym = theA * G4StatMFParameters::GetGamma0()
125 *(1. - 2.* theZARatio) * (1. - 2.* theZARatio);
126
127 // Surface term
128 G4double ESurf = A23*(G4StatMFParameters::Beta(T) - T*G4StatMFParameters::DBetaDT(T));
129
130 // Coulomb term
131 G4double ECoul = G4StatMFParameters::GetCoulomb()*A23*theA*theZARatio*theZARatio;
132
133 // Translational term
134 G4double ETrans = 1.5*T;
135 return _Energy = EVol + ESurf + ECoul + ETrans + ESym;
136 }
137
138 G4double G4StatMFMacroMultiNucleon::CalcEntropy(const G4double T,
139 const G4double FreeVol)
140 {
141 G4double Entropy = 0.0;
142 if (_MeanMultiplicity > 0.0) {
143
144 G4double ThermalWaveLenght = 16.15*fermi/std::sqrt(T);
145 G4double lambda3 = ThermalWaveLenght*ThermalWaveLenght*ThermalWaveLenght;
146 // Volume term
147 G4double SV = 2.0*theA*T/_InvLevelDensity;
148
149 // Surface term
150 G4double SS = -G4StatMFParameters::DBetaDT(T)*G4Pow::GetInstance()->Z23(theA);
151
152 // Translational term
153 G4double ST = 2.5 + G4Log(FreeVol * std::sqrt((G4double)theA) * theA
154 /(lambda3*_MeanMultiplicity));
155
156 Entropy = _MeanMultiplicity*(SV + SS + ST);
157 }
158 return Entropy;
159 }
160