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25 // 25 //
26 // neutron_hp -- source file 26 // neutron_hp -- source file
27 // J.P. Wellisch, Nov-1996 27 // J.P. Wellisch, Nov-1996
28 // A prototype of the low energy neutron trans 28 // A prototype of the low energy neutron transport model.
29 // 29 //
30 // 080801 Protect div0 error, when theCompundF 30 // 080801 Protect div0 error, when theCompundFraction is 1 by T. Koi
31 // 31 //
32 // P. Arce, June-2014 Conversion neutron_hp to 32 // P. Arce, June-2014 Conversion neutron_hp to particle_hp
33 // 33 //
34 // June-2019 - E. Mendoza --> perform some cor << 34 #include "G4ParticleHPKallbachMannSyst.hh"
35 <<
36 #include "G4ParticleHPKallbachMannSyst.hh" <<
37 <<
38 #include "G4Exp.hh" <<
39 #include "G4HadronicException.hh" <<
40 #include "G4Log.hh" <<
41 #include "G4Pow.hh" <<
42 #include "G4SystemOfUnits.hh" 35 #include "G4SystemOfUnits.hh"
43 #include "Randomize.hh" << 36 #include "Randomize.hh"
>> 37 #include "G4HadronicException.hh"
44 38
45 G4double G4ParticleHPKallbachMannSyst::Sample( 39 G4double G4ParticleHPKallbachMannSyst::Sample(G4double anEnergy)
46 { 40 {
47 G4double result = 0.; << 41 G4double result;
48 << 42
49 G4double zero = GetKallbachZero(anEnergy); 43 G4double zero = GetKallbachZero(anEnergy);
50 if (zero > 1) zero = 1.; << 44 if(zero>1) zero=1.;
51 if (zero < -1) zero = -1.; << 45 if(zero<-1)zero=-1.;
52 G4double max = Kallbach(zero, anEnergy); 46 G4double max = Kallbach(zero, anEnergy);
53 G4double upper = Kallbach(1., anEnergy); << 47 double upper = Kallbach(1., anEnergy);
54 G4double lower = Kallbach(-1., anEnergy); << 48 double lower = Kallbach(-1., anEnergy);
55 if (upper > max) max = upper; << 49 if(upper>max) max=upper;
56 if (lower > max) max = lower; << 50 if(lower>max) max=lower;
57 G4double value, random; 51 G4double value, random;
58 << 52 do
59 G4int icounter = 0; << 53 {
60 G4int icounter_max = 1024; << 54 result = 2.*G4UniformRand()-1;
61 do { << 55 value = Kallbach(result, anEnergy)/max;
62 icounter++; <<
63 if (icounter > icounter_max) { <<
64 G4cout << "Loop-counter exceeded the thr <<
65 << __FILE__ << "." << G4endl; <<
66 break; <<
67 } <<
68 result = 2. * G4UniformRand() - 1; <<
69 value = Kallbach(result, anEnergy) / max; <<
70 random = G4UniformRand(); 56 random = G4UniformRand();
71 } while (random > value); // Loop checking, << 57 }
72 << 58 while(random>value);
>> 59
73 return result; 60 return result;
74 } 61 }
75 62
76 G4double G4ParticleHPKallbachMannSyst::Kallbac 63 G4double G4ParticleHPKallbachMannSyst::Kallbach(G4double cosTh, G4double anEnergy)
77 { 64 {
78 // Kallbach-Mann systematics without normali 65 // Kallbach-Mann systematics without normalization.
79 G4double result; 66 G4double result;
80 G4double theX = A(anEnergy) * cosTh; << 67 G4double theX = A(anEnergy)*cosTh;
81 result = << 68 result = 0.5*(std::exp( theX)*(1+theCompoundFraction)
82 0.5 * (G4Exp(theX) * (1 + theCompoundFract << 69 +std::exp(-theX)*(1-theCompoundFraction));
83 return result; 70 return result;
84 } 71 }
85 72
86 G4double G4ParticleHPKallbachMannSyst::GetKall 73 G4double G4ParticleHPKallbachMannSyst::GetKallbachZero(G4double anEnergy)
87 { 74 {
88 G4double result; 75 G4double result;
89 // delta 2.0e-16 in not good. << 76 if ( theCompoundFraction == 1 )
90 // delta 4.0e-16 is OK << 77 {
91 // safety factor of 2 << 78 //G4cout << "080730b Adjust theCompoundFraction " << G4endl;
92 G4double delta = 8.0e-16; << 79 theCompoundFraction *= (1-1.0e-15);
93 if (std::abs(theCompoundFraction - 1) < delt << 80 }
94 theCompoundFraction = 1.0 - delta; << 81 result = 0.5 * (1./A(anEnergy)) * std::log((1-theCompoundFraction)/(1+theCompoundFraction));
95 } <<
96 result = 0.5 * (1. / A(anEnergy)) * G4Log((1 <<
97 return result; 82 return result;
98 } 83 }
99 84
100 G4double G4ParticleHPKallbachMannSyst::A(G4dou 85 G4double G4ParticleHPKallbachMannSyst::A(G4double anEnergy)
101 { << 86 {
102 G4double result; 87 G4double result;
103 G4double C1 = 0.04 / MeV; << 88 G4double C1 = 0.04/MeV;
104 G4double C2 = 1.8E-6 / (MeV * MeV * MeV); << 89 G4double C2 = 1.8E-6/(MeV*MeV*MeV);
105 G4double C3 = 6.7E-7 / (MeV * MeV * MeV * Me << 90 G4double C3 = 6.7E-7/(MeV*MeV*MeV*MeV);
106 << 91
107 G4double epsa = anEnergy * theTargetMass / ( << 92 G4double epsa = anEnergy*theTargetMass/(theTargetMass+theIncidentMass);
108 G4int Ac = theTargetA + theProjectileA; << 93 G4int Ac = theTargetA+1;
109 G4int Nc = Ac - theTargetZ - theProjectileZ; << 94 G4int Nc = Ac - theTargetZ;
110 G4int AA = theTargetA; << 95 G4int AA = theTargetA;
111 G4int ZA = theTargetZ; << 96 G4int ZA = theTargetZ;
112 G4double ea = epsa + SeparationEnergy(Ac, Nc << 97 G4double ea = epsa+SeparationEnergy(Ac, Nc, AA, ZA);
113 G4double Et1 = 130 * MeV; << 98 G4double Et1 = 130*MeV;
114 G4double R1 = std::min(ea, Et1); << 99 G4double R1 = std::min(ea, Et1);
115 // theProductEnergy is still in CMS!!! << 100 // theProductEnergy is still in CMS!!!
116 G4double epsb = theProductEnergy * (theProdu << 101 G4double epsb = theProductEnergy*(theProductMass+theResidualMass)/theResidualMass;
117 G4int AB = theResidualA; << 102 G4int AB = theResidualA;
118 G4int ZB = theResidualZ; << 103 G4int ZB = theResidualZ;
119 G4double eb = epsb + SeparationEnergy(Ac, Nc << 104 G4double eb = epsb+SeparationEnergy(Ac, Nc, AB, ZB );
120 G4double X1 = R1 * eb / ea; << 105 G4double X1 = R1*eb/ea;
121 G4double Et3 = 41 * MeV; << 106 G4double Et3 = 41*MeV;
122 G4double R3 = std::min(ea, Et3); << 107 G4double R3 = std::min(ea, Et3);
123 G4double X3 = R3 * eb / ea; << 108 G4double X3 = R3*eb/ea;
124 <<
125 G4double Ma = 1; 109 G4double Ma = 1;
126 G4double mb = 1; << 110 G4double mb(0);
127 if (theProjectileA == 1 || (theProjectileZ = << 111 G4int productA = theTargetA+1-theResidualA;
128 Ma = 1; << 112 G4int productZ = theTargetZ-theResidualZ;
129 } // neutron,proton,deuteron << 113 if(productZ==0)
130 else if (theProjectileA == 4 && theProjectil << 114 {
131 Ma = 0; << 115 mb = 0.5;
132 } // alpha <<
133 else if (theProjectileA == 3 && (theProjecti <<
134 Ma = 0.5; <<
135 } // tritum,He3 : set intermediate value <<
136 else { <<
137 throw G4HadronicException(__FILE__, __LINE <<
138 "Severe error in <<
139 } 116 }
140 if (theProductA == 1 && theProductZ == 0) { << 117 else if(productZ==1)
141 mb = 1. / 2.; << 118 {
142 } // neutron <<
143 else if (theProductA == 4 && theProductZ == <<
144 mb = 2; <<
145 } // alpha <<
146 else { <<
147 mb = 1; 119 mb = 1;
148 } 120 }
149 << 121 else if(productZ==2)
150 result = C1 * X1 + C2 * G4Pow::GetInstance() << 122 {
151 + C3 * Ma * mb * G4Pow::GetInstance << 123 mb = 2;
>> 124 if(productA==3) mb=1;
>> 125 }
>> 126 else
>> 127 {
>> 128 throw G4HadronicException(__FILE__, __LINE__, "Severe error in the sampling of Kallbach-Mann Systematics");
>> 129 }
>> 130
>> 131 result = C1*X1 + C2*std::pow(X1, 3.) + C3*Ma*mb*std::pow(X3, 4.);
152 return result; 132 return result;
153 } 133 }
154 134
155 G4double G4ParticleHPKallbachMannSyst::Separat << 135 G4double G4ParticleHPKallbachMannSyst::SeparationEnergy(G4int Ac, G4int Nc, G4int AA, G4int ZA)
156 <<
157 { 136 {
158 G4double result; 137 G4double result;
159 G4int NA = AA - ZA; << 138 G4int NA = AA-ZA;
160 G4int Zc = Ac - Nc; << 139 G4int Zc = Ac-Nc;
161 result = 15.68 * (Ac - AA); << 140 result = 15.68*(Ac-AA);
162 result += -28.07 * ((Nc - Zc) * (Nc - Zc) / << 141 result += -28.07*((Nc-Zc)*(Nc-Zc)/Ac - (NA-ZA)*(NA-ZA)/AA);
163 result += << 142 result += -18.56*(std::pow(G4double(Ac), 2./3.) - std::pow(G4double(AA), 2./3.));
164 -18.56 * (G4Pow::GetInstance()->A23(G4doub << 143 result += 33.22*((Nc-Zc)*(Nc-Zc)/std::pow(G4double(Ac), 4./3.) - (NA-ZA)*(NA-ZA)/std::pow(G4double(AA), 4./3.));
165 result += 33.22 << 144 result += -0.717*(Zc*Zc/std::pow(G4double(Ac),1./3.)-ZA*ZA/std::pow(G4double(AA),1./3.));
166 * ((Nc - Zc) * (Nc - Zc) / G4Pow:: << 145 result += 1.211*(Zc*Zc/Ac-ZA*ZA/AA);
167 - (NA - ZA) * (NA - ZA) / G4Pow <<
168 result += -0.717 <<
169 * (Zc * Zc / G4Pow::GetInstance()- <<
170 - ZA * ZA / G4Pow::GetInstance( <<
171 result += 1.211 * (Zc * Zc / (G4double)Ac - <<
172 G4double totalBinding(0); 146 G4double totalBinding(0);
173 if (Zbinding == 0 && Abinding == 1) totalBin << 147 G4int productA = theTargetA+1-theResidualA;
174 if (Zbinding == 1 && Abinding == 1) totalBin << 148 G4int productZ = theTargetZ-theResidualZ;
175 if (Zbinding == 1 && Abinding == 2) totalBin << 149 if(productZ==0&&productA==1) totalBinding=0;
176 if (Zbinding == 1 && Abinding == 3) totalBin << 150 if(productZ==1&&productA==1) totalBinding=0;
177 if (Zbinding == 2 && Abinding == 3) totalBin << 151 if(productZ==1&&productA==2) totalBinding=2.22;
178 if (Zbinding == 2 && Abinding == 4) totalBin << 152 if(productZ==1&&productA==3) totalBinding=8.48;
>> 153 if(productZ==2&&productA==3) totalBinding=7.72;
>> 154 if(productZ==2&&productA==4) totalBinding=28.3;
179 result += -totalBinding; 155 result += -totalBinding;
180 result *= MeV; 156 result *= MeV;
181 return result; 157 return result;
182 } 158 }
183 159