Import Geant4 0.0.0 source tree

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+// This code implementation is the intellectual property of
+// the RD44 GEANT4 collaboration.
+//
+// By copying, distributing or modifying the Program (or any work
+// based on the Program) you indicate your acceptance of this statement,
+// and all its terms.
+//
+// $Id: G4Positron.cc,v 2.3 1998/10/11 15:19:08 urban Exp $
+// GEANT4 tag $Name: geant4-00 $
+//
+// 
+// ----------------------------------------------------------------------
+//      GEANT 4 class implementation file
+//
+//      For information related to this code contact:
+//      CERN, CN Division, ASD Group
+//      History: first implementation, based on object model of
+//      4th April 1996, G.Cosmo
+// **********************************************************************
+//  Added particle definitions, H.Kurashige, 19 April 1996
+//  Added SetCuts implementation, L.Urban, 12 June 1996
+//  Code uses operators (+=, *=, ++, -> etc.) correctly, P. Urban, 26/6/96
+//  Add PositronDefinition(), H.Kurashige 4 July 1996
+// ----------------------------------------------------------------------
+
+#include <fstream.h>
+#include <iomanip.h>
+
+#include "G4Positron.hh"
+    
+// ######################################################################
+// ###                         POSITRON                               ###
+// ######################################################################
+
+G4Positron::G4Positron(
+       const G4String&     aName,        G4double            mass,
+       G4double            width,        G4double            charge,   
+       G4int               iSpin,        G4int               iParity,    
+       G4int               iConjugation, G4int               iIsospin,   
+       G4int               iIsospin3,    G4int               gParity,
+       const G4String&     pType,        G4int               lepton,      
+       G4int               baryon,       G4int               encoding,
+       G4bool              stable,       G4double            lifetime,
+       G4DecayTable        *decaytable )
+ : G4VLepton( aName,mass,width,charge,iSpin,iParity,
+	      iConjugation,iIsospin,iIsospin3,gParity,pType,
+              lepton,baryon,encoding,stable,lifetime,decaytable )
+{
+}
+
+
+// ......................................................................
+// ...                 static member definitions                      ...
+// ......................................................................
+//     
+//    Arguments for constructor are as follows
+//               name             mass          width         charge
+//             2*spin           parity  C-conjugation
+//          2*Isospin       2*Isospin3       G-parity
+//               type    lepton number  baryon number   PDG encoding
+//             stable         lifetime    decay table 
+G4Positron G4Positron::thePositron(
+		 "e+",  0.51099906*MeV,       0.0*MeV,    +1.*eplus, 
+		    1,               0,             0,          
+		    0,               0,             0,             
+	     "lepton",              -1,             0,          -11,
+		 true,            -1.0,          NULL
+);
+
+G4Positron* G4Positron::PositronDefinition() {return &thePositron;}
+// initialization for static cut values
+G4double   G4Positron::thePositronLengthCut = -1.0;
+G4double*  G4Positron::thePositronKineticEnergyCuts = NULL;
+
+// **********************************************************************
+// ************************* ComputeLoss ********************************
+// **********************************************************************
+
+G4double G4Positron::ComputeLoss(G4double AtomicNumber,
+                                 G4double KineticEnergy) const
+{
+  static G4double Z;  
+  static G4double taul, ionpot, ionpotlog;
+  const  G4double cbr1=0.02, cbr2=-5.7e-5, cbr3=1., cbr4=0.072;
+  const  G4double Tlow=10.*keV, Thigh=1.*GeV;
+  static G4double bremfactor = 0.1 ;
+
+  //  calculate dE/dx for electrons
+  if( abs(AtomicNumber-Z)>0.1 )
+  {
+    Z = AtomicNumber;
+    taul = Tlow/GetPDGMass();
+    ionpot = 1.6e-5*MeV*exp(0.9*log(Z))/GetPDGMass();
+    ionpotlog = log(ionpot);
+  } 
+
+
+  G4double tau = KineticEnergy/GetPDGMass();
+  G4double dEdx;
+
+  if(tau<taul)
+  {
+    G4double t1 = taul+1.;
+    G4double t2 = taul+2.;
+    G4double tsq = taul*taul;
+    G4double beta2 = taul*t2/(t1*t1);
+    G4double     f = 2.*log(taul)
+                     -(6.*taul+1.5*tsq-taul*(1.-tsq/3.)/t2-tsq*(0.5-tsq/12.)/
+                       (t2*t2))/(t1*t1);
+    dEdx = (log(2.*taul+4.)-2.*ionpotlog+f)/beta2;
+    dEdx = twopi_mc2_rcl2*Z*dEdx;
+    G4double clow = dEdx*sqrt(taul);
+    dEdx = clow/sqrt(KineticEnergy/GetPDGMass());
+  } else {
+    G4double t1 = tau+1.;
+    G4double t2 = tau+2.;
+    G4double tsq = tau*tau;
+    G4double beta2 = tau*t2/(t1*t1);
+    G4double f = 2.*log(tau)
+                 - (6.*tau+1.5*tsq-tau*(1.-tsq/3.)/t2-tsq*(0.5-tsq/12.)/
+                     (t2*t2))/(t1*t1);
+    dEdx = (log(2.*tau+4.)-2.*ionpotlog+f)/beta2;
+    dEdx = twopi_mc2_rcl2*Z*dEdx;
+
+    // loss from bremsstrahlung follows
+    G4double cbrem = (cbr1+cbr2*Z)
+                       *(cbr3+cbr4*log(KineticEnergy/Thigh));
+    cbrem = Z*(Z+1.)*cbrem*tau/beta2;
+    cbrem *= bremfactor ;
+    dEdx += twopi_mc2_rcl2*cbrem;
+  }
+  return dEdx;
+}
+
+// **********************************************************************
+// *********************** BuildRangeVector *****************************
+// **********************************************************************
+void G4Positron::BuildRangeVector(const G4Material* aMaterial,
+				  const G4LossTable* aLossTable,
+				  G4double       maxEnergy,
+				  G4double       aMass,
+                                  G4PhysicsLogVector* rangeVector)
+{
+  G4Electron* pElectron = G4Electron::ElectronDefinition();
+  pElectron->BuildRangeVector(aMaterial,
+			      aLossTable,
+			      maxEnergy,
+			      aMass,
+                              rangeVector);
+}