Import Geant4 7.0.0 source tree

2016-06-09 11:11:55 +02:00
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+//
+// ********************************************************************
+// * DISCLAIMER                                                       *
+// *                                                                  *
+// * The following disclaimer summarizes all the specific disclaimers *
+// * of contributors to this software. The specific disclaimers,which *
+// * govern, are listed with their locations in:                      *
+// *   http://cern.ch/geant4/license                                  *
+// *                                                                  *
+// * Neither the authors of this software system, nor their employing *
+// * institutes,nor the agencies providing financial support for this *
+// * work  make  any representation or  warranty, express or implied, *
+// * regarding  this  software system or assume any liability for its *
+// * use.                                                             *
+// *                                                                  *
+// * This  code  implementation is the  intellectual property  of the *
+// * 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: G4eeToTwoPiModel.cc,v 1.2 2004/12/01 18:13:44 vnivanch Exp $
+// GEANT4 tag $Name: geant4-07-00-cand-03 $
+//
+// -------------------------------------------------------------------
+//
+// GEANT4 Class header file
+//
+//
+// File name:     G4eeToTwoPiModel
+//
+// Author:        Vladimir Ivanchenko
+//
+// Creation date: 25.10.2003
+//
+// Modifications:
+//
+//
+// -------------------------------------------------------------------
+//
+
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+#include "G4eeToTwoPiModel.hh"
+#include "Randomize.hh"
+#include "G4PionPlus.hh"
+#include "G4PionMinus.hh"
+#include "G4DynamicParticle.hh"
+#include "G4PhysicsVector.hh"
+#include "G4PhysicsLinearVector.hh"
+#include "G4eeCrossSections.hh"
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+using namespace std;
+
+G4eeToTwoPiModel::G4eeToTwoPiModel(G4eeCrossSections* cr):
+  cross(cr)
+{
+  Initialise();
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+G4eeToTwoPiModel::~G4eeToTwoPiModel()
+{}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+void G4eeToTwoPiModel::Initialise()
+{
+  massPi = G4PionPlus::PionPlus()->GetPDGMass();
+  massRho = 770.*MeV;
+  highEnergy = 1.*GeV;
+  cross = new G4eeCrossSections();
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+G4PhysicsVector* G4eeToTwoPiModel::PhysicsVector(G4double emin, 
+                                                 G4double emax) const
+{
+  G4double tmin = max(emin, 2.0*massPi);
+  G4double tmax = max(tmin, emax);
+  G4int nbins = (G4int)((tmax - tmin)/MeV);
+  G4PhysicsVector* v = new G4PhysicsLinearVector(emin,emax,nbins);
+  return v;
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+vector<G4DynamicParticle*>* G4eeToTwoPiModel::SampleSecondaries(
+	    G4double e, const G4ThreeVector& direction) const
+{
+  vector<G4DynamicParticle*>* newp = new vector<G4DynamicParticle*>;
+  G4double tkin = 0.5*e - massPi;
+  if(tkin < 0.0) tkin = 0.0;
+  G4double cost;
+  do {
+    cost = 2.0*G4UniformRand() - 1.0;
+  } while( G4UniformRand() > 1.0 - cost*cost );
+
+  G4double sint = sqrt(1.0 - cost*cost);
+  G4double phi  = twopi * G4UniformRand();
+
+  G4ThreeVector dir(sint*cos(phi),sint*sin(phi), cost);
+  dir.rotateUz(direction);
+
+  // create G4DynamicParticle object for delta ray
+  G4DynamicParticle* pip = 
+     new G4DynamicParticle(G4PionPlus::PionPlus(),dir,tkin);
+  G4DynamicParticle* pin = 
+     new G4DynamicParticle(G4PionMinus::PionMinus(),-dir,tkin);
+  newp->push_back(pip);
+  newp->push_back(pin);
+  return newp;
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+