Geant4 Cross Reference |
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The name of the author may not be used to endorse or promote products 38 // derived from this software without specif 38 // derived from this software without specific prior written permission. 39 // 39 // 40 // THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``A 40 // THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 41 // WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 41 // WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 42 // MERCHANTABILITY AND FITNESS FOR A PARTICULA 42 // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO 43 // EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DI 43 // EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGE 44 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 45 // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES 45 // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 46 // OR BUSINESS INTERRUPTION) HOWEVER CAUSED AN 46 // OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 47 // WHETHER IN CONTRACT, STRICT LIABILITY, OR T 47 // WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 48 // OTHERWISE) ARISING IN ANY WAY OUT OF THE US 48 // OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 49 // ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 49 // ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 50 // 50 // 51 // Copyright (c) 2006 The Regents of the Unive 51 // Copyright (c) 2006 The Regents of the University of California. 52 // All rights reserved. 52 // All rights reserved. 53 // UCRL-CODE-224807 53 // UCRL-CODE-224807 54 // 54 // 55 // 55 // 56 // 56 // 57 57 58 #include <cmath> 58 #include <cmath> 59 #include "G4Exp.hh" 59 #include "G4Exp.hh" 60 #include "G4Log.hh" 60 #include "G4Log.hh" 61 #include "G4fissionEvent.hh" 61 #include "G4fissionEvent.hh" 62 62 63 #define TWOPI 6.283185307 63 #define TWOPI 6.283185307 64 #define SQRT2 1.414213562 64 #define SQRT2 1.414213562 65 #define BSHIFT -0.43287 65 #define BSHIFT -0.43287 66 #define WIDTH 1.079 66 #define WIDTH 1.079 67 67 68 G4double G4fissionEvent::G4SmpTerrell(G4double 68 G4double G4fissionEvent::G4SmpTerrell(G4double nubar) { 69 /* 69 /* 70 Description 70 Description 71 Sample Fission Number from Terrell's modif 71 Sample Fission Number from Terrell's modified Gaussian distribution 72 72 73 method uses Red Cullen's algoritm UCRL-TR- 73 method uses Red Cullen's algoritm UCRL-TR-222526 74 */ 74 */ 75 75 76 /* 76 /* 77 Input 77 Input 78 nubar - average number of neutrons per 78 nubar - average number of neutrons per fission 79 Output 79 Output 80 G4SmpTerrell - sampled multiplicity 80 G4SmpTerrell - sampled multiplicity 81 81 82 */ 82 */ 83 83 84 G4double width; 84 G4double width; 85 G4double temp1, temp2, expo, cshift; 85 G4double temp1, temp2, expo, cshift; 86 G4double rw, theta, sampleg; 86 G4double rw, theta, sampleg; 87 87 88 88 89 if (nubar < WIDTH) { 89 if (nubar < WIDTH) { 90 std::ostringstream o; 90 std::ostringstream o; 91 o << nubar; 91 o << nubar; 92 const std::string& errMsg = "fission nubar << 92 std::string errMsg = "fission nubar out of range, nubar=" + o.str(); 93 G4fissionerr(6, "SmpTerrell", errMsg); 93 G4fissionerr(6, "SmpTerrell", errMsg); 94 } 94 } 95 95 96 width = SQRT2 * WIDTH; 96 width = SQRT2 * WIDTH; 97 temp1 = nubar + 0.5; 97 temp1 = nubar + 0.5; 98 temp2 = temp1/width; 98 temp2 = temp1/width; 99 temp2 *= temp2; 99 temp2 *= temp2; 100 expo = G4Exp(-temp2); 100 expo = G4Exp(-temp2); 101 cshift = temp1 + BSHIFT * WIDTH * expo/(1. - 101 cshift = temp1 + BSHIFT * WIDTH * expo/(1. - expo); 102 102 103 G4int icounter = 0; 103 G4int icounter = 0; 104 G4int icounter_max = 1024; 104 G4int icounter_max = 1024; 105 do { 105 do { 106 rw = std::sqrt(-G4Log(fisslibrng())); 106 rw = std::sqrt(-G4Log(fisslibrng())); 107 theta = TWOPI * fisslibrng(); 107 theta = TWOPI * fisslibrng(); 108 sampleg = width * rw * std::cos(theta) + c 108 sampleg = width * rw * std::cos(theta) + cshift; 109 icounter++; 109 icounter++; 110 if ( icounter > icounter_max ) { 110 if ( icounter > icounter_max ) { 111 G4cout << "Loop-counter exceeded the thr 111 G4cout << "Loop-counter exceeded the threshold value at " << __LINE__ << "th line of " << __FILE__ << "." << G4endl; 112 break; 112 break; 113 } 113 } 114 } while (sampleg < 0.0); 114 } while (sampleg < 0.0); 115 // Loop checking, 11.03.2015, T. Koi 115 // Loop checking, 11.03.2015, T. Koi 116 116 117 return std::floor(sampleg); 117 return std::floor(sampleg); 118 } 118 } 119 119