[968] | 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 | // |
---|
[1340] | 26 | // $Id: G4PreCompoundTriton.cc,v 1.7 2010/08/28 15:16:55 vnivanch Exp $ |
---|
| 27 | // GEANT4 tag $Name: geant4-09-03-ref-09 $ |
---|
[968] | 28 | // |
---|
[1055] | 29 | // ------------------------------------------------------------------- |
---|
| 30 | // |
---|
| 31 | // GEANT4 Class file |
---|
| 32 | // |
---|
| 33 | // |
---|
| 34 | // File name: G4PreCompoundTriton |
---|
| 35 | // |
---|
| 36 | // Author: V.Lara |
---|
| 37 | // |
---|
| 38 | // Modified: |
---|
| 39 | // 21.08.2008 J. M. Quesada add choice of options |
---|
[1340] | 40 | // 20.08.2010 V.Ivanchenko added G4Pow and G4PreCompoundParameters pointers |
---|
| 41 | // use int Z and A and cleanup |
---|
[1055] | 42 | // |
---|
[968] | 43 | |
---|
| 44 | #include "G4PreCompoundTriton.hh" |
---|
[1340] | 45 | #include "G4Triton.hh" |
---|
[968] | 46 | |
---|
[1340] | 47 | G4PreCompoundTriton::G4PreCompoundTriton() |
---|
| 48 | : G4PreCompoundIon(G4Triton::Triton(), &theTritonCoulombBarrier) |
---|
| 49 | {} |
---|
[968] | 50 | |
---|
[1340] | 51 | G4PreCompoundTriton::~G4PreCompoundTriton() |
---|
| 52 | {} |
---|
[968] | 53 | |
---|
[1340] | 54 | G4double G4PreCompoundTriton::FactorialFactor(G4int N, const G4int P) |
---|
[1055] | 55 | { |
---|
[1340] | 56 | return G4double((N-3)*(P-2)*(N-2)*(P-1)*(N-1)*P)/6.0; |
---|
[1055] | 57 | } |
---|
[968] | 58 | |
---|
[1340] | 59 | G4double G4PreCompoundTriton::CoalescenceFactor(G4int A) |
---|
[1055] | 60 | { |
---|
[1340] | 61 | return 243.0/G4double(A*A); |
---|
[1055] | 62 | } |
---|
[968] | 63 | |
---|
[1340] | 64 | G4double G4PreCompoundTriton::GetRj(G4int nParticles, G4int nCharged) |
---|
[1055] | 65 | { |
---|
| 66 | G4double rj = 0.0; |
---|
[1340] | 67 | if(nCharged >= 1 && (nParticles-nCharged) >= 2) { |
---|
| 68 | G4double denominator = |
---|
| 69 | G4double(nParticles*(nParticles-1)*(nParticles-2)); |
---|
| 70 | rj = G4double(3*nCharged*(nParticles-nCharged)*(nParticles-nCharged-1)) |
---|
| 71 | /denominator; |
---|
[968] | 72 | } |
---|
[1055] | 73 | return rj; |
---|
| 74 | } |
---|
[968] | 75 | |
---|
[1340] | 76 | ////////////////////////////////////////////////////////////////////////////////// |
---|
[968] | 77 | //J. M. Quesada (Dec 2007-June 2008): New inverse reaction cross sections |
---|
| 78 | //OPT=0 Dostrovski's parameterization |
---|
| 79 | //OPT=1,2 Chatterjee's paramaterization |
---|
| 80 | //OPT=3,4 Kalbach's parameterization |
---|
| 81 | // |
---|
[1340] | 82 | G4double G4PreCompoundTriton::CrossSection(G4double K) |
---|
[968] | 83 | { |
---|
[1340] | 84 | ResidualA = GetRestA(); |
---|
| 85 | ResidualZ = GetRestZ(); |
---|
| 86 | theA = GetA(); |
---|
| 87 | theZ = GetZ(); |
---|
| 88 | ResidualAthrd = ResidualA13(); |
---|
| 89 | FragmentA = theA + ResidualA; |
---|
| 90 | FragmentAthrd = g4pow->Z13(FragmentA); |
---|
[968] | 91 | |
---|
[1340] | 92 | if (OPTxs==0) { return GetOpt0( K); } |
---|
| 93 | else if( OPTxs==1 || OPTxs==2) { return GetOpt12( K); } |
---|
| 94 | else if (OPTxs==3 || OPTxs==4) { return GetOpt34( K); } |
---|
[968] | 95 | else{ |
---|
| 96 | std::ostringstream errOs; |
---|
| 97 | errOs << "BAD TRITON CROSS SECTION OPTION !!" <<G4endl; |
---|
| 98 | throw G4HadronicException(__FILE__, __LINE__, errOs.str()); |
---|
| 99 | return 0.; |
---|
| 100 | } |
---|
| 101 | } |
---|
| 102 | |
---|
[1055] | 103 | G4double G4PreCompoundTriton::GetAlpha() |
---|
| 104 | { |
---|
| 105 | G4double C = 0.0; |
---|
[1340] | 106 | G4int aZ = theZ + ResidualZ; |
---|
[1055] | 107 | if (aZ >= 70) |
---|
| 108 | { |
---|
| 109 | C = 0.10; |
---|
| 110 | } |
---|
| 111 | else |
---|
| 112 | { |
---|
| 113 | C = ((((0.15417e-06*aZ) - 0.29875e-04)*aZ + 0.21071e-02)*aZ - 0.66612e-01)*aZ + 0.98375; |
---|
| 114 | } |
---|
[968] | 115 | |
---|
[1055] | 116 | return 1.0 + C/3.0; |
---|
| 117 | } |
---|
[1340] | 118 | |
---|
[968] | 119 | // |
---|
[1340] | 120 | //********************* OPT=1,2 : Chatterjee's cross section ***************** |
---|
[968] | 121 | //(fitting to cross section from Bechetti & Greenles OM potential) |
---|
| 122 | |
---|
[1340] | 123 | G4double G4PreCompoundTriton::GetOpt12(G4double K) |
---|
[968] | 124 | { |
---|
| 125 | G4double Kc=K; |
---|
| 126 | |
---|
| 127 | // JMQ xsec is set constat above limit of validity |
---|
[1340] | 128 | if (K > 50*MeV) { Kc=50*MeV; } |
---|
[968] | 129 | |
---|
| 130 | G4double landa ,mu ,nu ,p , Ec,q,r,ji,xs; |
---|
| 131 | |
---|
| 132 | G4double p0 = -11.04; |
---|
| 133 | G4double p1 = 619.1; |
---|
| 134 | G4double p2 = -2147.; |
---|
| 135 | G4double landa0 = -0.0426; |
---|
| 136 | G4double landa1 = -10.33; |
---|
| 137 | G4double mu0 = 601.9; |
---|
| 138 | G4double mu1 = 0.37; |
---|
| 139 | G4double nu0 = 583.0; |
---|
| 140 | G4double nu1 = -546.2; |
---|
| 141 | G4double nu2 = 1.718; |
---|
| 142 | G4double delta=1.2; |
---|
| 143 | |
---|
| 144 | Ec = 1.44*theZ*ResidualZ/(1.5*ResidualAthrd+delta); |
---|
| 145 | p = p0 + p1/Ec + p2/(Ec*Ec); |
---|
| 146 | landa = landa0*ResidualA + landa1; |
---|
[1340] | 147 | |
---|
| 148 | G4double resmu1 = g4pow->powZ(ResidualA,mu1); |
---|
| 149 | mu = mu0*resmu1; |
---|
| 150 | nu = resmu1*(nu0 + nu1*Ec + nu2*(Ec*Ec)); |
---|
[968] | 151 | q = landa - nu/(Ec*Ec) - 2*p*Ec; |
---|
| 152 | r = mu + 2*nu/Ec + p*(Ec*Ec); |
---|
| 153 | |
---|
| 154 | ji=std::max(Kc,Ec); |
---|
| 155 | if(Kc < Ec) { xs = p*Kc*Kc + q*Kc + r;} |
---|
| 156 | else {xs = p*(Kc - ji)*(Kc - ji) + landa*Kc + mu + nu*(2 - Kc/ji)/ji ;} |
---|
| 157 | |
---|
| 158 | if (xs <0.0) {xs=0.0;} |
---|
| 159 | |
---|
| 160 | return xs; |
---|
| 161 | } |
---|
| 162 | |
---|
| 163 | // *********** OPT=3,4 : Kalbach's cross sections (from PRECO code)************* |
---|
[1340] | 164 | G4double G4PreCompoundTriton::GetOpt34(G4double K) |
---|
[968] | 165 | // ** t from o.m. of hafele, flynn et al |
---|
| 166 | { |
---|
| 167 | G4double landa, mu, nu, p , signor(1.),sig; |
---|
[1055] | 168 | G4double ec,ecsq,xnulam,etest(0.),a; |
---|
| 169 | G4double b,ecut,cut,ecut2,geom,elab; |
---|
[968] | 170 | |
---|
[1055] | 171 | G4double flow = 1.e-18; |
---|
| 172 | G4double spill= 1.e+18; |
---|
[968] | 173 | |
---|
[1055] | 174 | G4double p0 = -21.45; |
---|
| 175 | G4double p1 = 484.7; |
---|
| 176 | G4double p2 = -1608.; |
---|
| 177 | G4double landa0 = 0.0186; |
---|
| 178 | G4double landa1 = -8.90; |
---|
| 179 | G4double mu0 = 686.3; |
---|
| 180 | G4double mu1 = 0.325; |
---|
| 181 | G4double nu0 = 368.9; |
---|
| 182 | G4double nu1 = -522.2; |
---|
| 183 | G4double nu2 = -4.998; |
---|
[968] | 184 | |
---|
[1055] | 185 | G4double ra=0.80; |
---|
[968] | 186 | |
---|
[1055] | 187 | //JMQ 13/02/09 increase of reduced radius to lower the barrier |
---|
| 188 | // ec = 1.44 * theZ * ResidualZ / (1.5*ResidualAthrd+ra); |
---|
| 189 | ec = 1.44 * theZ * ResidualZ / (1.7*ResidualAthrd+ra); |
---|
| 190 | ecsq = ec * ec; |
---|
| 191 | p = p0 + p1/ec + p2/ecsq; |
---|
| 192 | landa = landa0*ResidualA + landa1; |
---|
[1340] | 193 | a = g4pow->powZ(ResidualA,mu1); |
---|
[1055] | 194 | mu = mu0 * a; |
---|
| 195 | nu = a* (nu0+nu1*ec+nu2*ecsq); |
---|
| 196 | xnulam = nu / landa; |
---|
[1340] | 197 | if (xnulam > spill) { xnulam=0.; } |
---|
| 198 | if (xnulam >= flow) { etest = 1.2 *std::sqrt(xnulam); } |
---|
[968] | 199 | |
---|
[1055] | 200 | a = -2.*p*ec + landa - nu/ecsq; |
---|
| 201 | b = p*ecsq + mu + 2.*nu/ec; |
---|
| 202 | ecut = 0.; |
---|
| 203 | cut = a*a - 4.*p*b; |
---|
[1340] | 204 | if (cut > 0.) { ecut = std::sqrt(cut); } |
---|
[1055] | 205 | ecut = (ecut-a) / (p+p); |
---|
| 206 | ecut2 = ecut; |
---|
[1340] | 207 | //JMQ 290310 for avoiding unphysical increase below minimum (at ecut) |
---|
| 208 | // ecut<0 means that there is no cut with energy axis, i.e. xs is set |
---|
| 209 | // to 0 bellow minimum |
---|
| 210 | // if (cut < 0.) ecut2 = ecut - 2.; |
---|
| 211 | if (cut < 0.) { ecut2 = ecut; } |
---|
| 212 | elab = K * FragmentA / G4double(ResidualA); |
---|
[1055] | 213 | sig = 0.; |
---|
[968] | 214 | |
---|
[1055] | 215 | if (elab <= ec) { //start for E<Ec |
---|
[1340] | 216 | if (elab > ecut2) { sig = (p*elab*elab+a*elab+b) * signor; } |
---|
[1055] | 217 | } //end for E<Ec |
---|
| 218 | else { //start for E>Ec |
---|
| 219 | sig = (landa*elab+mu+nu/elab) * signor; |
---|
| 220 | geom = 0.; |
---|
[1340] | 221 | if (xnulam < flow || elab < etest) { return sig; } |
---|
[1055] | 222 | geom = std::sqrt(theA*K); |
---|
| 223 | geom = 1.23*ResidualAthrd + ra + 4.573/geom; |
---|
| 224 | geom = 31.416 * geom * geom; |
---|
| 225 | sig = std::max(geom,sig); |
---|
| 226 | } //end for E>Ec |
---|
| 227 | return sig; |
---|
[968] | 228 | } |
---|