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26 // Hadronic Process: Nuclear De-excitations 26 // Hadronic Process: Nuclear De-excitations
27 // by V. Lara (Oct 1998) 27 // by V. Lara (Oct 1998)
28 // 28 //
29 // Modifications: 29 // Modifications:
30 // 28.10.2010 V.Ivanchenko defined members in 30 // 28.10.2010 V.Ivanchenko defined members in constructor and cleaned up
31 31
32 #include "G4VEmissionProbability.hh" 32 #include "G4VEmissionProbability.hh"
33 #include "G4NuclearLevelData.hh" 33 #include "G4NuclearLevelData.hh"
34 #include "G4LevelManager.hh" 34 #include "G4LevelManager.hh"
35 #include "G4DeexPrecoParameters.hh" 35 #include "G4DeexPrecoParameters.hh"
36 #include "Randomize.hh" 36 #include "Randomize.hh"
37 #include "G4Pow.hh" 37 #include "G4Pow.hh"
38 #include "G4Log.hh" <<
39 #include "G4Exp.hh" <<
40 38
41 G4VEmissionProbability::G4VEmissionProbability 39 G4VEmissionProbability::G4VEmissionProbability(G4int Z, G4int A)
42 : pVerbose(1), theZ(Z), theA(A), elimit(CLHE << 40 : OPTxs(3),pVerbose(1),theZ(Z),theA(A),resZ(0),resA(0),
>> 41 pMass(0.0),pEvapMass(0.0),pResMass(0.0),fExc(0.0),fExcRes(0.0),
>> 42 elimit(CLHEP::MeV),accuracy(0.02),fFD(false)
43 { 43 {
44 pNuclearLevelData = G4NuclearLevelData::GetI 44 pNuclearLevelData = G4NuclearLevelData::GetInstance();
45 pG4pow = G4Pow::GetInstance(); 45 pG4pow = G4Pow::GetInstance();
46 if(A > 0) { pEvapMass = G4NucleiProperties:: 46 if(A > 0) { pEvapMass = G4NucleiProperties::GetNuclearMass(theA, theZ); }
47 G4DeexPrecoParameters* param = pNuclearLevel << 47 // G4cout << "G4VEvaporationProbability: Z= " << theZ << " A= " << theA
48 OPTxs = param->GetDeexModelType(); << 48 // << " M(GeV)= " << pEvapMass/1000. << G4endl;
>> 49 length = nbin = 0;
>> 50 emin = emax = eCoulomb = pProbability = probmax = 0.0;
49 } 51 }
50 52
>> 53 G4VEmissionProbability::~G4VEmissionProbability()
>> 54 {}
>> 55
51 void G4VEmissionProbability::Initialise() 56 void G4VEmissionProbability::Initialise()
52 { 57 {
53 G4DeexPrecoParameters* param = pNuclearLevel 58 G4DeexPrecoParameters* param = pNuclearLevelData->GetParameters();
>> 59 OPTxs = param->GetDeexModelType();
54 pVerbose = param->GetVerbose(); 60 pVerbose = param->GetVerbose();
55 fFD = param->GetDiscreteExcitationFlag(); 61 fFD = param->GetDiscreteExcitationFlag();
56 pTolerance = param->GetMinExcitation(); <<
57 pWidth = param->GetNuclearLevelWidth(); <<
58 } 62 }
59 63
60 void G4VEmissionProbability::ResetIntegrator(s << 64 void G4VEmissionProbability::ResetIntegrator(size_t nbins, G4double de, G4double eps)
61 { 65 {
>> 66 if(nbins > 0) { length = nbins; }
62 if(de > 0.0) { elimit = de; } 67 if(de > 0.0) { elimit = de; }
63 if(eps > 0.0) { accuracy = eps; } 68 if(eps > 0.0) { accuracy = eps; }
64 } 69 }
65 70
66 G4double G4VEmissionProbability::EmissionProba 71 G4double G4VEmissionProbability::EmissionProbability(const G4Fragment&, G4double)
67 { 72 {
68 return 0.0; 73 return 0.0;
69 } 74 }
70 75
71 G4double G4VEmissionProbability::ComputeProbab 76 G4double G4VEmissionProbability::ComputeProbability(G4double, G4double)
72 { 77 {
73 return 0.0; 78 return 0.0;
74 } 79 }
75 80
76 G4double G4VEmissionProbability::IntegrateProb 81 G4double G4VEmissionProbability::IntegrateProbability(G4double elow,
77 82 G4double ehigh,
78 83 G4double cb)
79 { 84 {
80 pProbability = 0.0; 85 pProbability = 0.0;
81 if(elow >= ehigh) { return pProbability; } 86 if(elow >= ehigh) { return pProbability; }
82 87
83 emin = elow; 88 emin = elow;
84 emax = ehigh; 89 emax = ehigh;
85 eCoulomb = cb; 90 eCoulomb = cb;
86 91
87 const G4double edeltamin = 0.1*CLHEP::MeV; << 92 G4double edelta = elimit;
>> 93 nbin = (size_t)((emax - emin)/edelta) + 1;
>> 94 const G4double edeltamin = 0.2*CLHEP::MeV;
88 const G4double edeltamax = 2*CLHEP::MeV; 95 const G4double edeltamax = 2*CLHEP::MeV;
89 G4double edelta = std::min(std::min(elimit, << 96 if(nbin < 4) {
90 G4double xbin = (emax - emin)/edelta + 1.0; << 97 nbin = 4;
91 G4int ibin = std::max((G4int)xbin, 4); << 98 edelta = (emax - emin)/(G4double)nbin;
92 << 99 } else if(nbin > length) {
93 // providing smart binning << 100 nbin = length;
94 G4int nbin = ibin*5; << 101 }
95 edelta = (emax - emin)/ibin; <<
96 102
97 G4double x(emin), y(0.0); << 103 G4double x(emin), del, y;
98 G4double edelmicro = edelta*0.02; << 104 G4double edelmicro= edelta*0.02;
99 probmax = ComputeProbability(x + edelmicro, 105 probmax = ComputeProbability(x + edelmicro, eCoulomb);
100 G4double problast = probmax; 106 G4double problast = probmax;
101 if(pVerbose > 1) { << 107 if(pVerbose > 2) {
102 G4cout << "### G4VEmissionProbability::Int << 108 G4cout << "### G4VEmissionProbability::IntegrateProbability: "
103 << "probmax=" << probmax << " Emin=" << e << 109 << " Emax= " << emax << " QB= " << cb << " nbin= " << nbin
104 << " Emax=" << emax << " QB=" << cb << " <<
105 << G4endl; 110 << G4endl;
>> 111 G4cout << " 0. E= " << emin << " prob= " << probmax << G4endl;
106 } 112 }
107 fE1 = fE2 = fP2 = 0.0; << 113 for(size_t i=1; i<=nbin; ++i) {
108 G4double emax0 = emax - edelmicro; <<
109 G4bool endpoint = false; <<
110 for(G4int i=0; i<nbin; ++i) { <<
111 x += edelta; 114 x += edelta;
112 if(x >= emax0) { << 115 if(x > emax) {
113 x = emax0; << 116 edelta += (emax - x);
114 endpoint = true; << 117 x = emax;
115 } << 118 }
116 y = ComputeProbability(x, eCoulomb); << 119 G4bool endpoint = (std::abs(x - emax) < edelmicro) ? true : false;
>> 120 G4double xx = endpoint ? x - edelmicro : x;
>> 121 y = ComputeProbability(xx, eCoulomb);
117 if(pVerbose > 2) { 122 if(pVerbose > 2) {
118 G4cout << " " << i << ". E= " << x < << 123 G4cout << " " << i << ". E= " << x << " prob= " << y
119 << " Edel= " << edelta << G4endl; 124 << " Edel= " << edelta << G4endl;
120 } 125 }
121 if(y >= probmax) { << 126 probmax = std::max(probmax, y);
122 probmax = y; << 127 del = (y + problast)*edelta*0.5;
123 } else if(0.0 == fE1 && 2*y < probmax) { <<
124 fE1 = x; <<
125 } <<
126 <<
127 G4double del = (y + problast)*edelta*0.5; <<
128 pProbability += del; 128 pProbability += del;
129 // end of the loop 129 // end of the loop
130 if(del < accuracy*pProbability || endpoint 130 if(del < accuracy*pProbability || endpoint) { break; }
131 problast = y; 131 problast = y;
132 132
133 // smart step definition 133 // smart step definition
134 if(del != pProbability && del > 0.8*pProba 134 if(del != pProbability && del > 0.8*pProbability &&
135 0.7*edelta > edeltamin) { 135 0.7*edelta > edeltamin) {
136 edelta *= 0.7; 136 edelta *= 0.7;
137 } else if(del < 0.1*pProbability && 1.5*ed 137 } else if(del < 0.1*pProbability && 1.5*edelta < edeltamax) {
138 edelta *= 1.5; 138 edelta *= 1.5;
139 } 139 }
140 } 140 }
141 if(fE1 > emin && fE1 < emax) { <<
142 fE2 = std::max(0.5*(fE1 + emax), emax - ed <<
143 fP2 = 2*ComputeProbability(fE2, eCoulomb); <<
144 } <<
145 141
146 if(pVerbose > 1) { 142 if(pVerbose > 1) {
147 G4cout << " Probability= " << pProbability 143 G4cout << " Probability= " << pProbability << " probmax= "
148 << probmax << " emin=" << emin << " << 144 << probmax << G4endl;
149 << " E1=" << fE1 << " E2=" << fE2 << G4en <<
150 } 145 }
151 return pProbability; 146 return pProbability;
152 } 147 }
153 148
154 G4double G4VEmissionProbability::SampleEnergy( 149 G4double G4VEmissionProbability::SampleEnergy()
155 { 150 {
156 static const G4double fact = 1.05; 151 static const G4double fact = 1.05;
157 static const G4double alim = 0.05; <<
158 static const G4double blim = 20.; <<
159 probmax *= fact; 152 probmax *= fact;
160 153
161 // two regions with flat and exponential maj <<
162 G4double del = emax - emin; <<
163 G4double p1 = 1.0; <<
164 G4double p2 = 0.0; <<
165 G4double a0 = 0.0; <<
166 G4double a1 = 1.0; <<
167 G4double x; <<
168 if(fE1 > 0.0 && fP2 > 0.0 && fP2 < 0.5*probm <<
169 a0 = G4Log(probmax/fP2)/(fE2 - fE1); <<
170 del= fE1 - emin; <<
171 p1 = del; <<
172 x = a0*(emax - fE1); <<
173 if(x < blim) { <<
174 a1 = (x > alim) ? 1.0 - G4Exp(-x) : x*(1 <<
175 } <<
176 p2 = a1/a0; <<
177 p1 /= (p1 + p2); <<
178 p2 = 1.0 - p1; <<
179 } <<
180 <<
181 if(pVerbose > 1) { 154 if(pVerbose > 1) {
182 G4cout << "### G4VEmissionProbability::Sam 155 G4cout << "### G4VEmissionProbability::SampleEnergy: "
183 << " Emin= " << emin << " Emax= " << emax 156 << " Emin= " << emin << " Emax= " << emax
184 << "/n E1=" << fE1 << " p1=" << << 157 << " probmax= " << probmax << G4endl;
185 << " probmax=" << probmax << " P2=" << fP <<
186 } 158 }
187 159
188 CLHEP::HepRandomEngine* rndm = G4Random::get 160 CLHEP::HepRandomEngine* rndm = G4Random::getTheEngine();
189 const G4int nmax = 1000; << 161 const G4int nmax = 100;
190 G4double ekin, gg, gmax; << 162 G4double del = emax - emin;
>> 163 G4double ekin, g;
191 G4int n = 0; 164 G4int n = 0;
192 do { 165 do {
>> 166 ekin = del*rndm->flat() + emin;
193 ++n; 167 ++n;
194 G4double q = rndm->flat(); << 168 g = ComputeProbability(ekin, eCoulomb);
195 if (p2 == 0.0) { <<
196 gmax = probmax; <<
197 ekin = del*q + emin; <<
198 } else if (q <= p1) { <<
199 gmax = probmax; <<
200 ekin = del*q/p1 + emin; <<
201 } else { <<
202 ekin = fE1 - G4Log(1.0 - (q - p1)*a1/p2) <<
203 x = a0*(ekin - fE1); <<
204 gmax = fP2; <<
205 if(x < blim) { <<
206 gmax = probmax*((x > alim) ? G4Exp(-x) : 1.0 <<
207 } <<
208 } <<
209 gg = ComputeProbability(ekin, eCoulomb); <<
210 if(pVerbose > 2) { 169 if(pVerbose > 2) {
211 G4cout << " " << n 170 G4cout << " " << n
212 << ". prob= " << gg << " probmax= " << << 171 << ". prob= " << g << " probmax= " << probmax
213 << " Ekin= " << ekin << G4endl; 172 << " Ekin= " << ekin << G4endl;
214 } 173 }
215 if((gg > gmax || n > nmax) && pVerbose > 1 << 174 if((g > probmax || n > nmax) && pVerbose > 1) {
216 G4cout << "### G4VEmissionProbability::S 175 G4cout << "### G4VEmissionProbability::SampleEnergy for Z= " << theZ
217 << " A= " << theA << " Eex(MeV)=" << 176 << " A= " << theA
218 << "\n Warning n= " << n 177 << "\n Warning n= " << n
219 << " prob/gmax=" << gg/gmax << 178 << " prob/probmax= " << g/probmax
220 << " prob=" << gg << " gmax=" << gmax < << 179 << " prob= " << g << " probmax= " << probmax
221 << "\n Ekin= " << ekin << " Emin= " 180 << "\n Ekin= " << ekin << " Emin= " << emin
222 << " Emax= " << emax << G4endl; 181 << " Emax= " << emax << G4endl;
223 } 182 }
224 } while(gmax*rndm->flat() > gg && n < nmax); << 183 } while(probmax*rndm->flat() > g && n < nmax);
225 G4double enew = FindRecoilExcitation(ekin); << 184 return (fFD) ? FindRecoilExcitation(ekin) : ekin;
226 if(pVerbose > 1) { <<
227 G4cout << "### SampleEnergy: Efinal= " <<
228 << enew << " E=" << ekin << " Eexc=" << <<
229 } <<
230 return enew; <<
231 } 185 }
232 186
233 G4double G4VEmissionProbability::FindRecoilExc << 187 G4double G4VEmissionProbability::FindRecoilExcitation(G4double e)
234 { 188 {
>> 189 fExcRes = 0.0;
235 G4double mass = pEvapMass + fExc; 190 G4double mass = pEvapMass + fExc;
>> 191 // abnormal case - should never happens
>> 192 if(pMass < mass + pResMass) { return 0.0; }
236 193
237 G4double m02 = pMass*pMass; << 194 G4double m02 = pMass*pMass;
238 G4double m12 = mass*mass; << 195 G4double m12 = mass*mass;
239 G4double m22 = pResMass*pResMass; << 196 G4double m22 = pResMass*pResMass;
240 G4double mres = std::sqrt(m02 + m12 - 2.*pMa << 197 G4double mres = std::sqrt(m02 + m12 - 2.*pMass*(mass + e));
241 198
242 fExcRes = mres - pResMass; 199 fExcRes = mres - pResMass;
>> 200 const G4double tolerance = 0.1*CLHEP::keV;
243 201
244 if(pVerbose > 1) { 202 if(pVerbose > 1) {
245 G4cout << "### FindRecoilExcitation for re << 203 G4cout << "### G4VEmissionProbability::FindRecoilExcitation for resZ= "
246 << resZ << " resA= " << resA 204 << resZ << " resA= " << resA
247 << " evaporated Z= " << theZ << " A 205 << " evaporated Z= " << theZ << " A= " << theA
248 << " Ekin= " << e << " Eexc= " << fExcRes 206 << " Ekin= " << e << " Eexc= " << fExcRes << G4endl;
249 } 207 }
250 208
251 // residual nucleus is in the ground state 209 // residual nucleus is in the ground state
252 if(fExcRes < pTolerance) { << 210 if(fExcRes < tolerance) {
253 fExcRes = 0.0; 211 fExcRes = 0.0;
254 return std::max(0.5*(m02 + m12 - m22)/pMas << 212 //G4cout<<"Ground state Ekin= "<< 0.5*(m02 + m12 - m22)/pMass - mass<<G4endl;
>> 213 return std::max(0.5*(m02 + m12 - m22)/pMass - mass,0.0);
255 } 214 }
256 if(!fFD) { return e; } <<
257 <<
258 // select final state excitation 215 // select final state excitation
259 auto lManager = pNuclearLevelData->GetLevelM 216 auto lManager = pNuclearLevelData->GetLevelManager(resZ, resA);
260 if(nullptr == lManager) { return e; } << 217 if(!lManager) { return e; }
261 218
>> 219 //G4cout<<"ExcMax= "<< lManager->MaxLevelEnergy()<<" CB= "<<eCoulomb<<G4endl;
262 // levels are not known 220 // levels are not known
263 if(fExcRes > lManager->MaxLevelEnergy() + pT << 221 if(fExcRes > lManager->MaxLevelEnergy() + tolerance) { return e; }
264 222
265 // find level 223 // find level
266 std::size_t idx = lManager->NearestLevelInde << 224 auto idx = lManager->NearestLevelIndex(fExcRes);
267 auto level = lManager->GetLevel(idx); << 225 //G4cout << "idx= " << idx << " Exc= " << fExcRes
268 << 226 // << " Elevel= " << lManager->LevelEnergy(idx) << G4endl;
269 // unstable level << 227 for(; idx > 0; --idx) {
270 if (level->GetTimeGamma() == 0.0) { return e << 228 fExcRes = lManager->LevelEnergy(idx);
271 << 229 // excited level
272 // is possible to use level energy? << 230 if(pMass > mass + pResMass + fExcRes && lManager->FloatingLevel(idx) == 0) {
273 G4double elevel = lManager->LevelEnergy(idx) << 231 G4double massR = pResMass + fExcRes;
274 if (std::abs(elevel - fExcRes) > pWidth || p << 232 G4double mr2 = massR*massR;
275 return e; << 233 //G4cout << "Result idx= " << idx << " Eexc= " << fExcRes
276 } << 234 // << " Ekin= " << 0.5*(m02 + m12 - mr2)/pMass - mass << G4endl;
277 << 235 return std::max(0.5*(m02 + m12 - mr2)/pMass - mass,0.0);
278 // long-lived level << 236 }
279 G4double massR = pResMass + elevel; << 237 }
280 G4double mr2 = massR*massR; << 238 // ground level
281 fExcRes = elevel; << 239 fExcRes = 0.0;
282 return std::max(0.5*(m02 + m12 - mr2)/pMass << 240 //G4cout << "Ground state Ekin= " << 0.5*(m02 + m12 - m22)/pMass - mass << G4endl;
>> 241 return std::max(0.5*(m02 + m12 - m22)/pMass - mass,0.0);
283 } 242 }
284 243