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Please see the license in the file LICENSE and URL above * // * for the full disclaimer and the limitation of liability. * // * * // * This code implementation is the result of the scientific and * // * technical work of the GEANT4 collaboration. * // * By using, copying, modifying or distributing the software (or * // * any work based on the software) you agree to acknowledge its * // * use in resulting scientific publications, and indicate your * // * acceptance of all terms of the Geant4 Software license. * // ******************************************************************** // // $Id: G4DeuteronEvaporationProbability.cc,v 1.20 2010/11/17 11:06:03 vnivanch Exp $ // GEANT4 tag $Name: geant4-09-04-ref-00 $ // // J.M. Quesada (August2008). Based on: // // Hadronic Process: Nuclear De-excitations // by V. Lara (Oct 1998) // // Modified: // 03-09-2008 J.M. Quesada for external choice of inverse cross section option // 17-11-2010 V.Ivanchenko integer Z and A #include "G4DeuteronEvaporationProbability.hh" G4DeuteronEvaporationProbability::G4DeuteronEvaporationProbability() : G4EvaporationProbability(2,1,3,&theCoulombBarrier) // A,Z,Gamma (fixed JMQ) {} G4DeuteronEvaporationProbability::~G4DeuteronEvaporationProbability() {} G4double G4DeuteronEvaporationProbability::CalcAlphaParam(const G4Fragment & fragment) { return 1.0 + CCoeficient(fragment.GetZ_asInt()-GetZ()); } G4double G4DeuteronEvaporationProbability::CalcBetaParam(const G4Fragment & ) { return 0.0; } G4double G4DeuteronEvaporationProbability::CCoeficient(G4int aZ) { // Data comes from // Dostrovsky, Fraenkel and Friedlander // Physical Review, vol 116, num. 3 1959 // // const G4int size = 5; // G4double Zlist[5] = { 10.0, 20.0, 30.0, 50.0, 70.0}; // G4double Cp[5] = { 0.50, 0.28, 0.20, 0.15, 0.10}; // C for deuteron is equal to C for protons divided by 2 G4double C = 0.0; if (aZ >= 70) { C = 0.10; } else { C = ((((0.15417e-06*aZ) - 0.29875e-04)*aZ + 0.21071e-02)*aZ - 0.66612e-01)*aZ + 0.98375; } return C/2.0; } /////////////////////////////////////////////////////////////////////////////////// //J. M. Quesada (Dec 2007-June 2008): New inverse reaction cross sections //OPT=0 Dostrovski's parameterization //OPT=1,2 Chatterjee's paramaterization //OPT=3,4 Kalbach's parameterization // G4double G4DeuteronEvaporationProbability::CrossSection(const G4Fragment & fragment, G4double K) { theA=GetA(); theZ=GetZ(); ResidualA=fragment.GetA_asInt()-theA; ResidualZ=fragment.GetZ_asInt()-theZ; ResidualAthrd=fG4pow->Z13(ResidualA); FragmentA=fragment.GetA_asInt(); FragmentAthrd=fG4pow->Z13(FragmentA); if (OPTxs==0) {std::ostringstream errOs; errOs << "We should'n be here (OPT =0) at evaporation cross section calculation (deuterons)!!" < 50*MeV) { Kc = 50*MeV; } G4double landa ,mu ,nu ,p , Ec,q,r,ji,xs; G4double p0 = -38.21; G4double p1 = 922.6; G4double p2 = -2804.; G4double landa0 = -0.0323; G4double landa1 = -5.48; G4double mu0 = 336.1; G4double mu1 = 0.48; G4double nu0 = 524.3; G4double nu1 = -371.8; G4double nu2 = -5.924; G4double delta=1.2; Ec = 1.44*theZ*ResidualZ/(1.5*ResidualAthrd+delta); p = p0 + p1/Ec + p2/(Ec*Ec); landa = landa0*ResidualA + landa1; G4double resmu1 = fG4pow->powZ(ResidualA,mu1); mu = mu0*resmu1; nu = resmu1*(nu0 + nu1*Ec + nu2*(Ec*Ec)); q = landa - nu/(Ec*Ec) - 2*p*Ec; r = mu + 2*nu/Ec + p*(Ec*Ec); ji=std::max(Kc,Ec); if(Kc < Ec) { xs = p*Kc*Kc + q*Kc + r;} else {xs = p*(Kc - ji)*(Kc - ji) + landa*Kc + mu + nu*(2 - Kc/ji)/ji ;} if (xs <0.0) {xs=0.0;} return xs; } // *********** OPT=3,4 : Kalbach's cross sections (from PRECO code)************* G4double G4DeuteronEvaporationProbability::GetOpt34(G4double K) // ** d from o.m. of perey and perey { G4double landa, mu, nu, p ,signor(1.),sig; G4double ec,ecsq,xnulam,etest(0.),a; G4double b,ecut,cut,ecut2,geom,elab; G4double flow = 1.e-18; G4double spill= 1.e+18; G4double p0 = 0.798; G4double p1 = 420.3; G4double p2 = -1651.; G4double landa0 = 0.00619; G4double landa1 = -7.54; G4double mu0 = 583.5; G4double mu1 = 0.337; G4double nu0 = 421.8; G4double nu1 = -474.5; G4double nu2 = -3.592; G4double ra=0.80; //JMQ 13/02/09 increase of reduced radius to lower the barrier // ec = 1.44 * theZ * ResidualZ / (1.5*ResidualAthrd+ra); ec = 1.44 * theZ * ResidualZ / (1.7*ResidualAthrd+ra); ecsq = ec * ec; p = p0 + p1/ec + p2/ecsq; landa = landa0*ResidualA + landa1; a = fG4pow->powZ(ResidualA,mu1); mu = mu0 * a; nu = a* (nu0+nu1*ec+nu2*ecsq); xnulam = nu / landa; if (xnulam > spill) { xnulam=0.; } if (xnulam >= flow) { etest = 1.2 *std::sqrt(xnulam); } a = -2.*p*ec + landa - nu/ecsq; b = p*ecsq + mu + 2.*nu/ec; ecut = 0.; cut = a*a - 4.*p*b; if (cut > 0.) { ecut = std::sqrt(cut); } ecut = (ecut-a) / (p+p); ecut2 = ecut; //JMQ 290310 for avoiding unphysical increase below minimum (at ecut) //ecut<0 means that there is no cut with energy axis, i.e. xs is set //to 0 bellow minimum // if (cut < 0.) ecut2 = ecut - 2.; if (cut < 0.) { ecut2 = ecut; } elab = K * FragmentA / G4double(ResidualA); sig = 0.; if (elab <= ec) { //start for E ecut2) { sig = (p*elab*elab+a*elab+b) * signor; } } //end for EEc sig = (landa*elab+mu+nu/elab) * signor; geom = 0.; if (xnulam < flow || elab < etest) { return sig; } geom = std::sqrt(theA*K); geom = 1.23*ResidualAthrd + ra + 4.573/geom; geom = 31.416 * geom * geom; sig = std::max(geom,sig); } //end for E>Ec return sig; }