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00059 #define nZAfis 39
00060 #define WATTEMIN 1.0e-6
00061 #define WATTEMAX 20.0
00062
00063 #include <cmath>
00064 #include "G4fissionEvent.hh"
00065
00066 G4double G4fissionEvent::G4SmpWatt(G4double ePart, G4int iso) {
00067
00068
00069
00070
00071
00072
00073
00074
00075
00076
00077
00078
00079
00080
00081 static G4int nZA [nZAfis]= {
00082 90231, 90232, 90233,
00083 91233,
00084 92232, 92233, 92234, 92235, 92236, 92237, 92238, 92239, 92240,
00085 93235, 93236, 93237, 93238,
00086 94237, 94238, 94239, 94240, 94241, 94242, 94243,
00087 95241, 95242, 95243,
00088 96242, 96243, 96244, 96245, 96246, 96247, 96248,
00089 97249,
00090 98249, 98250, 98251, 98252
00091 };
00092
00093 static G4double Watta [nZAfis][3] = {
00094 {6.00949285e-05, -8.36695381e-03, 9.50939496e-01},
00095 {6.54348443e-05, -8.86574327e-03, 9.55404490e-01},
00096 {7.08173682e-05, -9.22676286e-03, 9.50088329e-01},
00097 {6.35839062e-05, -8.63645973e-03, 9.24583535e-01},
00098 {8.21929628e-05, 4.01922936e-03, 1.152121164e00},
00099 {6.21335718e-05, -8.45651858e-03, 9.14717276e-01},
00100 {6.81386135e-05, -8.99142394e-03, 9.21954824e-01},
00101 {7.32627297e-05, -9.36908697e-03, 9.20107976e-01},
00102 {8.06505279e-05, -9.95416671e-03, 9.27890410e-01},
00103 {8.33208285e-05, -1.01073057e-02, 9.17691654e-01},
00104 {8.96944680e-05, -1.06491070e-02, 9.25496030e-01},
00105 {9.44608097e-05, -1.08940419e-02, 9.17795511e-01},
00106 {1.01395704e-04, -1.15098159e-02, 9.29395462e-01},
00107 {6.81110009e-05, -8.91619352e-03, 9.00047566e-01},
00108 {7.21126359e-05, -9.20179363e-03, 8.95722889e-01},
00109 {7.82371142e-05, -9.67050621e-03, 8.99574933e-01},
00110 {8.27256297e-05, -9.99353009e-03, 8.97461897e-01},
00111 {7.29458059e-05, -9.22415170e-03, 8.80996165e-01},
00112 {8.02383914e-05, -9.78291439e-03, 8.88964070e-01},
00113 {8.50641730e-05, -1.01099145e-02, 8.87304833e-01},
00114 {9.10537157e-05, -1.05303084e-02, 8.89438514e-01},
00115 {9.43014320e-05, -1.07133543e-02, 8.82632055e-01},
00116 {1.02655616e-04, -1.13154691e-02, 8.91617174e-01},
00117 {1.06118094e-04, -1.14971777e-02, 8.85181637e-01},
00118 {9.08474473e-05, -1.04296303e-02, 8.71942958e-01},
00119 {9.35633054e-05, -1.05612167e-02, 8.63930371e-01},
00120 {1.01940441e-04, -1.11573929e-02, 8.73153437e-01},
00121 {9.19501202e-05, -1.04229157e-02, 8.58681822e-01},
00122 {9.42991674e-05, -1.05098872e-02, 8.49103546e-01},
00123 {1.02747171e-04, -1.11371417e-02, 8.60434431e-01},
00124 {1.05024967e-04, -1.12138980e-02, 8.51101942e-01},
00125 {1.14130011e-04, -1.18692049e-02, 8.62838259e-01},
00126 {1.15163673e-04, -1.18553822e-02, 8.51306646e-01},
00127 {1.27169055e-04, -1.27033210e-02, 8.68623539e-01},
00128 {1.24195213e-04, -1.24047085e-02, 8.48974077e-01},
00129 {1.12616150e-04, -1.15135023e-02, 8.19708800e-01},
00130 {1.23637465e-04, -1.22869889e-02, 8.35392018e-01},
00131 {1.22724317e-04, -1.21677963e-02, 8.22569523e-01},
00132 {1.33891595e-04, -1.29267762e-02, 8.37122909e-01} };
00133
00134 G4double a;
00135 G4double b=1.0;
00136
00137 G4double rand1,rand2;
00138 G4double x,y,z;
00139 G4double eSmp;
00140 G4int i;
00141
00142
00143
00144
00145
00146 G4int isoindex=-1;
00147 for (i=0; isoindex == -1 && i<nZAfis; i++) {
00148 if (iso == nZA[i]) isoindex = i;
00149 }
00150 if (isoindex == -1) {
00151 std::ostringstream o;
00152 o << iso;
00153 std::string errMsg = "No Watt spectrum available for iso " + o.str();
00154 G4fissionerr(6, "SmpWatt", errMsg);
00155 }
00156
00157 a= Watta[isoindex][2] + ePart*(Watta[isoindex][1] + ePart*Watta[isoindex][0]);
00158
00159 x= 1. + (b/(8.*a));
00160 y= (x + std::sqrt(x*x-1.))/a;
00161 z= a*y - 1.;
00162
00163 do {
00164
00165 rand1= -std::log(fisslibrng());
00166 rand2= -std::log(fisslibrng());
00167 eSmp= y*rand1;
00168
00169 } while ((rand2-z*(rand1+1.))*(rand2-z*(rand1+1.)) > b*y*rand1 ||
00170 eSmp < WATTEMIN || eSmp > WATTEMAX);
00171
00172
00173 return eSmp;
00174 }