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25 // 25 //
>> 26 //
>> 27 // $Id: G4VEmissionProbability.cc 66241 2012-12-13 18:34:42Z gunter $
>> 28 //
26 // Hadronic Process: Nuclear De-excitations 29 // Hadronic Process: Nuclear De-excitations
27 // by V. Lara (Oct 1998) 30 // by V. Lara (Oct 1998)
28 // 31 //
29 // Modifications: 32 // Modifications:
30 // 28.10.2010 V.Ivanchenko defined members in 33 // 28.10.2010 V.Ivanchenko defined members in constructor and cleaned up
31 34
32 #include "G4VEmissionProbability.hh" 35 #include "G4VEmissionProbability.hh"
33 #include "G4NuclearLevelData.hh" 36 #include "G4NuclearLevelData.hh"
34 #include "G4LevelManager.hh" <<
35 #include "G4DeexPrecoParameters.hh" 37 #include "G4DeexPrecoParameters.hh"
36 #include "Randomize.hh" 38 #include "Randomize.hh"
37 #include "G4Pow.hh" <<
38 #include "G4Log.hh" <<
39 #include "G4Exp.hh" <<
40 39
41 G4VEmissionProbability::G4VEmissionProbability 40 G4VEmissionProbability::G4VEmissionProbability(G4int Z, G4int A)
42 : pVerbose(1), theZ(Z), theA(A), elimit(CLHE << 41 :OPTxs(3),fVerbose(0),theZ(Z),theA(A),
>> 42 LevelDensity(0.1),elimit(CLHEP::MeV),accuracy(0.02)
43 { 43 {
44 pNuclearLevelData = G4NuclearLevelData::GetI << 44 fG4pow = G4Pow::GetInstance();
45 pG4pow = G4Pow::GetInstance(); << 45 fPairCorr = G4NuclearLevelData::GetInstance()->GetPairingCorrection();
46 if(A > 0) { pEvapMass = G4NucleiProperties:: << 46 length = nfilled = 0;
47 G4DeexPrecoParameters* param = pNuclearLevel << 47 emin = emax = eCoulomb = probmax = eprobmax = totProbability = 0.0;
48 OPTxs = param->GetDeexModelType(); <<
49 } 48 }
50 49
51 void G4VEmissionProbability::Initialise() << 50 G4VEmissionProbability::~G4VEmissionProbability()
52 { << 51 {}
53 G4DeexPrecoParameters* param = pNuclearLevel <<
54 pVerbose = param->GetVerbose(); <<
55 fFD = param->GetDiscreteExcitationFlag(); <<
56 pTolerance = param->GetMinExcitation(); <<
57 pWidth = param->GetNuclearLevelWidth(); <<
58 } <<
59 52
60 void G4VEmissionProbability::ResetIntegrator(s << 53 void G4VEmissionProbability::Initialise()
61 { 54 {
62 if(de > 0.0) { elimit = de; } << 55 G4DeexPrecoParameters* param = G4NuclearLevelData::GetInstance()->GetParameters();
63 if(eps > 0.0) { accuracy = eps; } << 56 OPTxs = param->GetDeexModelType();
>> 57 LevelDensity = param->GetLevelDensity();
64 } 58 }
65 59
66 G4double G4VEmissionProbability::EmissionProba << 60 void G4VEmissionProbability::ResetIntegrator(size_t nbin, G4double de, G4double eps)
67 { 61 {
68 return 0.0; << 62 if(nbin > 0) {
>> 63 fProb.clear();
>> 64 fEner.clear();
>> 65 fEner.resize(nbin+1, 0.0);
>> 66 fProb.resize(nbin+1, 0.0);
>> 67 length = nbin;
>> 68 }
>> 69 if(de > 0.0) { elimit = de; }
>> 70 if(accuracy > 0.0) { accuracy = eps; }
69 } 71 }
70 72
71 G4double G4VEmissionProbability::ComputeProbab 73 G4double G4VEmissionProbability::ComputeProbability(G4double, G4double)
72 { 74 {
73 return 0.0; 75 return 0.0;
74 } 76 }
75 77
76 G4double G4VEmissionProbability::IntegrateProb << 78 G4double
77 << 79 G4VEmissionProbability::IntegrateProbability(G4double elow, G4double ehigh, G4double cb)
78 <<
79 { 80 {
80 pProbability = 0.0; << 81 totProbability = 0.0;
81 if(elow >= ehigh) { return pProbability; } << 82 if(elow >= ehigh) { return totProbability; }
82 83
83 emin = elow; 84 emin = elow;
84 emax = ehigh; 85 emax = ehigh;
85 eCoulomb = cb; 86 eCoulomb = cb;
86 87
87 const G4double edeltamin = 0.1*CLHEP::MeV; << 88 size_t nbin = (size_t)((emax - emin)/elimit) + 1;
88 const G4double edeltamax = 2*CLHEP::MeV; << 89 G4double edelta = elimit;
89 G4double edelta = std::min(std::min(elimit, << 90 if(nbin < 3) {
90 G4double xbin = (emax - emin)/edelta + 1.0; << 91 nbin = 3;
91 G4int ibin = std::max((G4int)xbin, 4); << 92 edelta = (emax - emin)/(G4double)nbin;
92 << 93 }
93 // providing smart binning << 94 if(nbin > length) {
94 G4int nbin = ibin*5; << 95 fEner.resize(nbin + 1);
95 edelta = (emax - emin)/ibin; << 96 fProb.resize(nbin + 1);
96 << 97 length = nbin;
97 G4double x(emin), y(0.0); << 98 }
98 G4double edelmicro = edelta*0.02; << 99
99 probmax = ComputeProbability(x + edelmicro, << 100 G4double x(emin), del, y;
100 G4double problast = probmax; << 101 G4double problast = ComputeProbability(x, eCoulomb);
101 if(pVerbose > 1) { << 102 eprobmax= emin;
102 G4cout << "### G4VEmissionProbability::Int << 103 probmax = problast;
103 << "probmax=" << probmax << " Emin=" << e << 104 fEner[0] = emin;
104 << " Emax=" << emax << " QB=" << cb << " << 105 fProb[0] = problast;
>> 106 size_t i(0);
>> 107 if(fVerbose > 1) {
>> 108 G4cout << "### G4VEmissionProbability::IntegrateProbability: "
>> 109 << " Emax= " << emax << " QB= " << cb << " nbin= " << nbin
105 << G4endl; 110 << G4endl;
>> 111 G4cout << " 0. E= " << emin << " prob= " << problast << G4endl;
106 } 112 }
107 fE1 = fE2 = fP2 = 0.0; << 113 static const G4double edeltamin = 0.2*CLHEP::MeV;
108 G4double emax0 = emax - edelmicro; << 114 static const G4double edeltamax = 2*CLHEP::MeV;
109 G4bool endpoint = false; << 115 G4bool peak = true;
110 for(G4int i=0; i<nbin; ++i) { << 116 do {
>> 117 ++i;
111 x += edelta; 118 x += edelta;
112 if(x >= emax0) { << 119 if(x > emax) {
113 x = emax0; << 120 x = emax;
114 endpoint = true; << 121 edelta = emax - fEner[i-1];
115 } 122 }
116 y = ComputeProbability(x, eCoulomb); 123 y = ComputeProbability(x, eCoulomb);
117 if(pVerbose > 2) { << 124 if(fVerbose > 1) {
118 G4cout << " " << i << ". E= " << x < << 125 G4cout << " " << i << ". E= " << x << " prob= " << y
119 << " Edel= " << edelta << G4endl; 126 << " Edel= " << edelta << G4endl;
120 } 127 }
121 if(y >= probmax) { << 128 fEner[i] = x;
122 probmax = y; << 129 fProb[i] = y;
123 } else if(0.0 == fE1 && 2*y < probmax) { << 130 del = (y + problast)*edelta*0.5;
124 fE1 = x; << 131 totProbability += del;
125 } <<
126 <<
127 G4double del = (y + problast)*edelta*0.5; <<
128 pProbability += del; <<
129 // end of the loop <<
130 if(del < accuracy*pProbability || endpoint <<
131 problast = y; <<
132 132
133 // smart step definition 133 // smart step definition
134 if(del != pProbability && del > 0.8*pProba << 134 if(del < accuracy*totProbability) { break; }
135 0.7*edelta > edeltamin) { << 135 else if(del != totProbability && del > 0.8*totProbability
136 edelta *= 0.7; << 136 && edelta > edeltamin)
137 } else if(del < 0.1*pProbability && 1.5*ed << 137 { edelta *= 0.5; }
138 edelta *= 1.5; << 138 else if(del < 0.1*totProbability && edelta < edeltamax)
139 } << 139 { edelta *= 2.0; }
140 } << 140 if(y > probmax) {
141 if(fE1 > emin && fE1 < emax) { << 141 probmax = y;
142 fE2 = std::max(0.5*(fE1 + emax), emax - ed << 142 eprobmax = x;
143 fP2 = 2*ComputeProbability(fE2, eCoulomb); << 143 } else if(peak && y < probmax) {
144 } << 144 edelta *= 2.0;
>> 145 peak = false;
>> 146 }
>> 147 problast = y;
>> 148 // Loop checking, 10-Mar-2017, Vladimir Ivanchenko
>> 149 } while(i < nbin && x < emax);
145 150
146 if(pVerbose > 1) { << 151 nfilled = i;
147 G4cout << " Probability= " << pProbability << 152 if(fVerbose > 1) { G4cout << " Probability= " << totProbability << G4endl; }
148 << probmax << " emin=" << emin << " << 153 return totProbability;
149 << " E1=" << fE1 << " E2=" << fE2 << G4en <<
150 } <<
151 return pProbability; <<
152 } 154 }
153 155
154 G4double G4VEmissionProbability::SampleEnergy( 156 G4double G4VEmissionProbability::SampleEnergy()
155 { 157 {
156 static const G4double fact = 1.05; << 158 static const G4double fact = 1.1;
157 static const G4double alim = 0.05; <<
158 static const G4double blim = 20.; <<
159 probmax *= fact; 159 probmax *= fact;
>> 160 if(0.0 == fProb[nfilled] && nfilled > 2) { --nfilled; }
>> 161 for(size_t i=0; i<=nfilled; ++i) {
>> 162 fProb[i] *= fact;
>> 163 }
>> 164 G4double ekin(0.0), s1(1.0), s2(0.0), ksi(0.0), psi(1.0), z(0.0);
160 165
161 // two regions with flat and exponential maj << 166 if(fVerbose > 1) {
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) { <<
182 G4cout << "### G4VEmissionProbability::Sam 167 G4cout << "### G4VEmissionProbability::SampleEnergy: "
183 << " Emin= " << emin << " Emax= " << emax 168 << " Emin= " << emin << " Emax= " << emax
184 << "/n E1=" << fE1 << " p1=" << << 169 << " Nf= " << nfilled << G4endl;
185 << " probmax=" << probmax << " P2=" << fP << 170 }
>> 171 G4double x0 = emax;
>> 172 G4double x1 = fEner[nfilled-1];
>> 173 G4double x2 = fEner[nfilled];
>> 174 G4double y0 = probmax;
>> 175 G4double y1 = fProb[nfilled-1];
>> 176 G4double y2 = fProb[nfilled];
>> 177 G4bool islog(false);
>> 178 // a condition if a special treatment of falling down
>> 179 // distribution is needed
>> 180 //
>> 181 G4double ee = 0.5*(emax - emin);
>> 182 if(nfilled > 5 && y2 > 0.0 && y2 < 0.1*y0 && y1 > 0.0 && x1 - emin < ee) {
>> 183 ksi = G4Log(y1/y2)/G4Log(x2/x1);
>> 184 x0 = x2*G4Exp(-G4Log(y0/y2)/ksi);
>> 185 // general condition to have two sampling area
>> 186 if(x0 < x1 && x0 > eprobmax && x0 - emin < ee) {
>> 187 // condition when the first area does not exist
>> 188 if(x0 <= emin) {
>> 189 s1 = 0.0;
>> 190 s2 = 1.0;
>> 191 y0 *= G4Exp(G4Log(x0/emin)*ksi);
>> 192 x0 = emin;
>> 193 } else {
>> 194 s1 = (x0 - emin)*y0;
>> 195 }
>> 196 // parameters of the second area
>> 197 if(std::abs(1.0 - ksi) < 0.1) {
>> 198 z = G4Log(emax/x0);
>> 199 if(s1 > 0.0) { s2 = x0*y0*z; }
>> 200 islog = true;
>> 201 } else {
>> 202 psi = 1.0/(1.0 - ksi);
>> 203 z = G4Exp(G4Log(emax/x0)*(1. - ksi)) - 1.;
>> 204 if(s1 > 0.0) { s2 = std::max(y0*x0*z*psi, 0.0); }
>> 205 }
>> 206 }
>> 207 }
>> 208 G4double sum = s1 + s2;
>> 209 if(fVerbose > 1) {
>> 210 G4cout << " Epeak= " << eprobmax << " e0= " << x0 << " e1= " << x1 << " e2= " << x2
>> 211 << " psi= " << psi << G4endl;
>> 212 G4cout << " s1= " << s1 << " s2= " << s2
>> 213 << " y0= " << y0 << " y1= " << y1 << " y2= " << y2 << " z= " << z
>> 214 << G4endl;
>> 215 for(size_t i=0; i<=nfilled; ++i) {
>> 216 G4cout << i << ". E= " << fEner[i] << " P= " << fProb[i] << G4endl;
>> 217 }
186 } 218 }
187 219
188 CLHEP::HepRandomEngine* rndm = G4Random::get 220 CLHEP::HepRandomEngine* rndm = G4Random::getTheEngine();
189 const G4int nmax = 1000; << 221 static const G4int nmax = 100;
190 G4double ekin, gg, gmax; << 222 G4double gr, g;
191 G4int n = 0; << 223 for(size_t i=0; i<nmax; ++i) {
192 do { << 224 G4double q = sum*rndm->flat();
193 ++n; << 225 if(s2 <= 0.0 || q <= s1) {
194 G4double q = rndm->flat(); << 226 gr = y0;
195 if (p2 == 0.0) { << 227 ekin = emin + (x0 - emin)*q/s1;
196 gmax = probmax; << 228 } else if(islog) {
197 ekin = del*q + emin; << 229 ekin = x0*G4Exp((q - s1)*z/s2);
198 } else if (q <= p1) { << 230 gr = y0*x0/ekin;
199 gmax = probmax; <<
200 ekin = del*q/p1 + emin; <<
201 } else { 231 } else {
202 ekin = fE1 - G4Log(1.0 - (q - p1)*a1/p2) << 232 ekin = x0*G4Exp(G4Log(1.0 + (q - s1)*z/s2)*psi);
203 x = a0*(ekin - fE1); << 233 gr = y0*G4Exp(G4Log(x0/ekin)*ksi);
204 gmax = fP2; <<
205 if(x < blim) { <<
206 gmax = probmax*((x > alim) ? G4Exp(-x) : 1.0 <<
207 } <<
208 } 234 }
209 gg = ComputeProbability(ekin, eCoulomb); << 235 g = ComputeProbability(ekin, eCoulomb);
210 if(pVerbose > 2) { << 236 if(fVerbose > 1) {
211 G4cout << " " << n << 237 G4cout << " " << i
212 << ". prob= " << gg << " probmax= " << << 238 << ". prob= " << g << " probmax= " << gr
213 << " Ekin= " << ekin << G4endl; 239 << " Ekin= " << ekin << G4endl;
214 } 240 }
215 if((gg > gmax || n > nmax) && pVerbose > 1 << 241 if(g > gr && fVerbose > 0) {
216 G4cout << "### G4VEmissionProbability::S << 242 G4cout << "### G4VEmissionProbability::SampleEnergy Warning i= " << i
217 << " A= " << theA << " Eex(MeV)=" << 243 << " prob/probmax= " << g/gr << " rndm= " << q
218 << "\n Warning n= " << n << 244 << "\n prob= " << g << " probmax= " << gr
219 << " prob/gmax=" << gg/gmax << 245 << " z= " << z << " ksi= " << ksi
220 << " prob=" << gg << " gmax=" << gmax < <<
221 << "\n Ekin= " << ekin << " Emin= " 246 << "\n Ekin= " << ekin << " Emin= " << emin
222 << " Emax= " << emax << G4endl; << 247 << " Emax= " << emax << " E0= " << x0 << G4endl;
>> 248 G4cout << " s1= " << s1 << " s2= " << s2
>> 249 << " y0= " << y0 << " y1= " << y1 << " y2= " << y2 << G4endl;
>> 250 for(size_t j=0; j<=nfilled; ++j) {
>> 251 G4cout << j << ". E= " << fEner[j] << " P= " << fProb[j] << G4endl;
>> 252 }
223 } 253 }
224 } while(gmax*rndm->flat() > gg && n < nmax); << 254 if(gr*rndm->flat() <= g) { break; }
225 G4double enew = FindRecoilExcitation(ekin); <<
226 if(pVerbose > 1) { <<
227 G4cout << "### SampleEnergy: Efinal= " <<
228 << enew << " E=" << ekin << " Eexc=" << <<
229 } 255 }
230 return enew; << 256 return ekin;
231 } 257 }
232 258
233 G4double G4VEmissionProbability::FindRecoilExc <<
234 { <<
235 G4double mass = pEvapMass + fExc; <<
236 <<
237 G4double m02 = pMass*pMass; <<
238 G4double m12 = mass*mass; <<
239 G4double m22 = pResMass*pResMass; <<
240 G4double mres = std::sqrt(m02 + m12 - 2.*pMa <<
241 <<
242 fExcRes = mres - pResMass; <<
243 <<
244 if(pVerbose > 1) { <<
245 G4cout << "### FindRecoilExcitation for re <<
246 << resZ << " resA= " << resA <<
247 << " evaporated Z= " << theZ << " A <<
248 << " Ekin= " << e << " Eexc= " << fExcRes <<
249 } <<
250 <<
251 // residual nucleus is in the ground state <<
252 if(fExcRes < pTolerance) { <<
253 fExcRes = 0.0; <<
254 return std::max(0.5*(m02 + m12 - m22)/pMas <<
255 } <<
256 if(!fFD) { return e; } <<
257 <<
258 // select final state excitation <<
259 auto lManager = pNuclearLevelData->GetLevelM <<
260 if(nullptr == lManager) { return e; } <<
261 <<
262 // levels are not known <<
263 if(fExcRes > lManager->MaxLevelEnergy() + pT <<
264 <<
265 // find level <<
266 std::size_t idx = lManager->NearestLevelInde <<
267 auto level = lManager->GetLevel(idx); <<
268 <<
269 // unstable level <<
270 if (level->GetTimeGamma() == 0.0) { return e <<
271 <<
272 // is possible to use level energy? <<
273 G4double elevel = lManager->LevelEnergy(idx) <<
274 if (std::abs(elevel - fExcRes) > pWidth || p <<
275 return e; <<
276 } <<
277 <<
278 // long-lived level <<
279 G4double massR = pResMass + elevel; <<
280 G4double mr2 = massR*massR; <<
281 fExcRes = elevel; <<
282 return std::max(0.5*(m02 + m12 - mr2)/pMass <<
283 } <<
284 259