[819] | 1 | // |
---|
| 2 | // ******************************************************************** |
---|
| 3 | // * License and Disclaimer * |
---|
| 4 | // * * |
---|
| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
---|
| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
---|
| 7 | // * conditions of the Geant4 Software License, included in the file * |
---|
| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
---|
| 9 | // * include a list of copyright holders. * |
---|
| 10 | // * * |
---|
| 11 | // * Neither the authors of this software system, nor their employing * |
---|
| 12 | // * institutes,nor the agencies providing financial support for this * |
---|
| 13 | // * work make any representation or warranty, express or implied, * |
---|
| 14 | // * regarding this software system or assume any liability for its * |
---|
| 15 | // * use. Please see the license in the file LICENSE and URL above * |
---|
| 16 | // * for the full disclaimer and the limitation of liability. * |
---|
| 17 | // * * |
---|
| 18 | // * This code implementation is the result of the scientific and * |
---|
| 19 | // * technical work of the GEANT4 collaboration. * |
---|
| 20 | // * By using, copying, modifying or distributing the software (or * |
---|
| 21 | // * any work based on the software) you agree to acknowledge its * |
---|
| 22 | // * use in resulting scientific publications, and indicate your * |
---|
| 23 | // * acceptance of all terms of the Geant4 Software license. * |
---|
| 24 | // ******************************************************************** |
---|
| 25 | // |
---|
| 26 | // |
---|
| 27 | #ifndef G4ProjectileFragmentCrossSection_h |
---|
| 28 | #define G4ProjectileFragmentCrossSection_h 1 |
---|
| 29 | |
---|
| 30 | #include <cmath> |
---|
| 31 | #include <iostream> |
---|
| 32 | |
---|
| 33 | // Implements Physical Review C61, 034607 (2000) |
---|
| 34 | // Rewrite starting from EPAX Version 2 |
---|
| 35 | |
---|
| 36 | class G4ProjectileFragmentCrossSection |
---|
| 37 | { |
---|
| 38 | public: |
---|
| 39 | G4ProjectileFragmentCrossSection() |
---|
| 40 | { |
---|
| 41 | p_S[1] = -2.38; // scale factor for xsect in barn |
---|
| 42 | p_S[2] = 0.27; |
---|
| 43 | |
---|
| 44 | p_P[1] = -2.5840E+00; // slope of mass yield curve |
---|
| 45 | p_P[2] = -7.5700E-03; |
---|
| 46 | |
---|
| 47 | p_Delta[1] = -1.0870E+00; // centroid rel. to beta-stability |
---|
| 48 | p_Delta[2] = +3.0470E-02; |
---|
| 49 | p_Delta[3] = +2.1353E-04; |
---|
| 50 | p_Delta[4] = +7.1350E+01; |
---|
| 51 | |
---|
| 52 | p_R[1] = +0.885E+00; // width parameter R |
---|
| 53 | p_R[2] = -9.8160E-03; |
---|
| 54 | |
---|
| 55 | p_Un[1] = 1.65; // slope par. n-rich ride of Z distr. |
---|
| 56 | |
---|
| 57 | p_Up[1] = 1.7880; // slope par. p-rich ride of Z distr. |
---|
| 58 | p_Up[2] = +4.7210E-03; |
---|
| 59 | p_Up[3] = -1.3030E-05; |
---|
| 60 | |
---|
| 61 | p_mn[1] = 0.400; // memory effect n-rich projectiles |
---|
| 62 | p_mn[2] = 0.600; |
---|
| 63 | |
---|
| 64 | p_mp[1] = -10.25; // memory effect p-rich projectiles |
---|
| 65 | p_mp[2] = +10.1; |
---|
| 66 | |
---|
| 67 | corr_d[1] = -25.0; // correction close to proj.: centroid dzp |
---|
| 68 | corr_d[2] = 0.800; |
---|
| 69 | corr_r[1] = +20.0; // correction close to proj.: width R |
---|
| 70 | corr_r[2] = 0.820; |
---|
| 71 | corr_y[1] = 200.0; // correction close to proj.: Yield_a |
---|
| 72 | corr_y[2] = 0.90; |
---|
| 73 | } |
---|
| 74 | |
---|
| 75 | inline G4double doit(G4double Ap, G4double Zp, G4double At, G4double Zt, G4double A, G4double Z) |
---|
| 76 | { |
---|
| 77 | // calculate mass yield |
---|
| 78 | G4double Ap13 = std::pow(Ap, 1./3.); |
---|
| 79 | G4double At13 = std::pow(At, 1./3.); |
---|
| 80 | G4double S = p_S[2] * (At13 + Ap13 + p_S[1]); |
---|
| 81 | // cout << "debug0 "<<S<<" "<<At13<<" "<<Ap13<<" "<<p_S[1]<<" "<<p_S[2]<<endl; |
---|
| 82 | G4double p = std::exp(p_P[2]*Ap + p_P[1]); |
---|
| 83 | G4double yield_a = p * S * std::exp(-p * (Ap - A)); |
---|
| 84 | cout << "debug1 "<<yield_a<<endl; |
---|
| 85 | // modification close to projectile |
---|
| 86 | G4double f_mod_y=1.0; |
---|
| 87 | if (A/Ap > corr_y[2]) |
---|
| 88 | { |
---|
| 89 | f_mod_y=corr_y[1]*std::pow(A/Ap-corr_y[2], 2) + 1.0; |
---|
| 90 | } |
---|
| 91 | yield_a= yield_a * f_mod_y; |
---|
| 92 | cout << "debug1 "<<yield_a<<endl; |
---|
| 93 | |
---|
| 94 | // calculate maximum of charge dispersion zprob |
---|
| 95 | G4double zbeta = A/(1.98+0.0155*std::pow(A, (2./3.))); |
---|
| 96 | G4double zbeta_p = Ap/(1.98+0.0155*std::pow(Ap, (2./3.))); |
---|
| 97 | G4double delta; |
---|
| 98 | if(A > p_Delta[4]) |
---|
| 99 | { |
---|
| 100 | delta = p_Delta[1] + p_Delta[2]*A; |
---|
| 101 | } |
---|
| 102 | else |
---|
| 103 | { |
---|
| 104 | delta = p_Delta[3]*A*A; |
---|
| 105 | } |
---|
| 106 | |
---|
| 107 | // modification close to projectile |
---|
| 108 | G4double f_mod=1.0; |
---|
| 109 | if(A/Ap > corr_d[2]) |
---|
| 110 | { |
---|
| 111 | f_mod = corr_d[1]*std::pow(A/Ap-corr_d[2], 2) + 1.0; |
---|
| 112 | } |
---|
| 113 | delta = delta*f_mod; |
---|
| 114 | G4double zprob = zbeta+delta; |
---|
| 115 | |
---|
| 116 | // correction for proton- and neutron-rich projectiles |
---|
| 117 | G4double dq; |
---|
| 118 | if((Zp-zbeta_p)>0) |
---|
| 119 | { |
---|
| 120 | dq = std::exp(p_mp[1] + G4double(A)/G4double(Ap)*p_mp[2]); |
---|
| 121 | cout << "dq "<<A<<" "<<Ap<<" "<<p_mp[1] |
---|
| 122 | <<" "<<p_mp[2]<<" "<<dq<<" "<<p_mp[1] + A/Ap*p_mp[2]<<endl; |
---|
| 123 | } |
---|
| 124 | else |
---|
| 125 | { |
---|
| 126 | dq = p_mn[1]*std::pow(A/Ap, 2.0) + p_mn[2]*std::pow(A/Ap, 4.0); |
---|
| 127 | } |
---|
| 128 | zprob = zprob + dq * (Zp-zbeta_p); |
---|
| 129 | |
---|
| 130 | // small corr. since Xe-129 and Pb-208 are not on Z_beta line |
---|
| 131 | zprob = zprob + 0.0020*A; |
---|
| 132 | cout <<"zprob "<<A<<" "<<dq<<" "<<Zp<<" "<<zbeta_p |
---|
| 133 | <<" "<<zbeta<<" "<<delta<<endl; |
---|
| 134 | |
---|
| 135 | // calculate width parameter R |
---|
| 136 | G4double r = std::exp(p_R[1] + p_R[2]*A); |
---|
| 137 | |
---|
| 138 | // modification close to projectile |
---|
| 139 | f_mod=1.0; |
---|
| 140 | if (A/Ap > corr_r[2]) |
---|
| 141 | { |
---|
| 142 | f_mod = corr_r[1]*Ap*std::pow(A/Ap-corr_r[2], 4.0)+1.0; |
---|
| 143 | } |
---|
| 144 | r = r*f_mod; |
---|
| 145 | |
---|
| 146 | // change width according to dev. from beta-stability |
---|
| 147 | if ((Zp-zbeta_p) < 0.0) |
---|
| 148 | { |
---|
| 149 | r=r*(1.0-0.0833*std::abs(Zp-zbeta_p)); |
---|
| 150 | } |
---|
| 151 | |
---|
| 152 | // calculate slope parameters u_n, u_p |
---|
| 153 | G4double u_n = p_Un[1]; |
---|
| 154 | G4double u_p = p_Up[1] + p_Up[2]*A + p_Up[3]*A*A; |
---|
| 155 | |
---|
| 156 | // calculate charge dispersion |
---|
| 157 | G4double expo, fract; |
---|
| 158 | if((zprob-Z) > 0) |
---|
| 159 | { |
---|
| 160 | // neutron-rich |
---|
| 161 | expo = -r*std::pow(std::abs(zprob-Z), u_n); |
---|
| 162 | fract = std::exp(expo)*std::sqrt(r/3.14159); |
---|
| 163 | } |
---|
| 164 | else |
---|
| 165 | { |
---|
| 166 | // proton-rich |
---|
| 167 | expo = -r*std::pow(std::abs(zprob-Z), u_p); |
---|
| 168 | fract = std::exp(expo)*std::sqrt(r/3.14159); |
---|
| 169 | cout << "1 "<<expo<<" "<<r<<" "<<zprob<<" "<<Z<<" "<<u_p<<endl; |
---|
| 170 | // go to exponential slope |
---|
| 171 | G4double dfdz = 1.2 + 0.647*std::pow(A/2.,0.3); |
---|
| 172 | G4double z_exp = zprob + dfdz * std::log(10.) / (2.*r); |
---|
| 173 | if( Z>z_exp ) |
---|
| 174 | { |
---|
| 175 | expo = -r*std::pow(std::abs(zprob-z_exp), u_p); |
---|
| 176 | fract = std::exp(expo)*std::sqrt(r/3.14159) |
---|
| 177 | / std::pow(std::pow(10, dfdz), Z-z_exp); |
---|
| 178 | } |
---|
| 179 | } |
---|
| 180 | |
---|
| 181 | cout << "debug "<<fract<<" "<<yield_a<<endl; |
---|
| 182 | G4double epaxv2=fract*yield_a; |
---|
| 183 | return epaxv2; |
---|
| 184 | } |
---|
| 185 | |
---|
| 186 | void testMe() |
---|
| 187 | { |
---|
| 188 | G4ProjectileFragmentCrossSection i; |
---|
| 189 | cout << i.doit(58, 28, 9, 4, 49, 28) << endl; |
---|
| 190 | // Sigma = 9.800163E-13 b |
---|
| 191 | } |
---|
| 192 | private: |
---|
| 193 | G4double p_S[3]; |
---|
| 194 | G4double p_P[3]; |
---|
| 195 | G4double p_Delta[5]; |
---|
| 196 | G4double p_R[3]; |
---|
| 197 | G4double p_Un[2]; |
---|
| 198 | G4double p_Up[4]; |
---|
| 199 | G4double p_mn[3]; |
---|
| 200 | G4double p_mp[3]; |
---|
| 201 | G4double corr_d[3]; |
---|
| 202 | G4double corr_r[3]; |
---|
| 203 | G4double corr_y[3]; |
---|
| 204 | }; |
---|
| 205 | #endif |
---|