Import Geant4 10.1.0 source tree

2016-06-10 12:08:39 +02:00
parent 286caacf06
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+//
+// ********************************************************************
+// * License and Disclaimer                                           *
+// *                                                                  *
+// * The  Geant4 software  is  copyright of the Copyright Holders  of *
+// * the Geant4 Collaboration.  It is provided  under  the terms  and *
+// * conditions of the Geant4 Software License,  included in the file *
+// * LICENSE and available at  http://cern.ch/geant4/license .  These *
+// * include a list of copyright holders.                             *
+// *                                                                  *
+// * 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.  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.          *
+// ********************************************************************
+//
+////////////////////////////////////////////////////////////////////////////////
+//                                                                            //
+//  File:   G4AlphaDecay.cc                                                   //
+//  Author: D.H. Wright (SLAC)                                                //
+//  Date:   20 October 2014                                                   //
+//                                                                            //
+////////////////////////////////////////////////////////////////////////////////
+
+#include "G4AlphaDecay.hh"
+#include "G4IonTable.hh"
+#include "Randomize.hh"
+#include "G4ThreeVector.hh"
+#include "G4DynamicParticle.hh"
+#include "G4DecayProducts.hh"
+#include "G4PhysicalConstants.hh"
+#include "G4SystemOfUnits.hh"
+#include <iostream>
+#include <iomanip>
+
+G4AlphaDecay::G4AlphaDecay(const G4ParticleDefinition* theParentNucleus,
+                           const G4double& branch, const G4double& Qvalue,
+                           const G4double& excitationE)
+ : G4VDecayChannel("alpha decay"), transitionQ(Qvalue), daughterEx(excitationE),
+   halflifeThreshold(nanosecond)
+{
+  SetParent(theParentNucleus);  // Store name of parent nucleus, delete G4MT_parent 
+  SetBR(branch);
+
+  SetNumberOfDaughters(2);
+  SetDaughter(0, "alpha");      // Store name of 1st daughter
+  G4IonTable* theIonTable =
+    (G4IonTable*)(G4ParticleTable::GetParticleTable()->GetIonTable());
+  G4int daughterZ = theParentNucleus->GetAtomicNumber() - 2;
+  G4int daughterA = theParentNucleus->GetAtomicMass() - 4; 
+  SetDaughter(1, theIonTable->GetIon(daughterZ, daughterA, daughterEx) );
+}
+
+
+G4AlphaDecay::G4AlphaDecay(const G4AlphaDecay& right)
+ : G4VDecayChannel(right), transitionQ(right.transitionQ),
+   daughterEx(right.daughterEx), halflifeThreshold(right.halflifeThreshold)
+{}
+
+
+G4AlphaDecay::~G4AlphaDecay()
+{}
+
+
+G4DecayProducts* G4AlphaDecay::DecayIt(G4double)
+{
+  // Fill G4MT_parent with theParentNucleus (stored by SetParent in ctor)  
+  if (G4MT_parent == 0) FillParent();
+
+  // Fill G4MT_daughters with alpha and residual nucleus (stored by SetDaughter)  
+  if (G4MT_daughters == 0) FillDaughters();
+
+  G4double alphaMass = G4MT_daughters[0]->GetPDGMass();
+  // Excitation energy included in PDG mass
+  G4double nucleusMass = G4MT_daughters[1]->GetPDGMass();
+
+  // Q value was calculated from atomic masses.
+  // Use it to get correct alpha energy.
+  G4double cmMomentum = std::sqrt(transitionQ*(transitionQ + 2.*alphaMass)*
+                                (transitionQ + 2.*nucleusMass)*
+                                (transitionQ + 2.*alphaMass + 2.*nucleusMass) )/
+                                (transitionQ + alphaMass + nucleusMass)/2.; 
+
+  // Set up final state
+  // parentParticle is set at rest here because boost with correct momentum 
+  // is done later
+  G4DynamicParticle parentParticle(G4MT_parent, G4ThreeVector(0,0,0), 0.0);
+  G4DecayProducts* products = new G4DecayProducts(parentParticle);
+
+  G4double costheta = 2.*G4UniformRand()-1.0;
+  G4double sintheta = std::sqrt(1.0 - costheta*costheta);
+  G4double phi  = twopi*G4UniformRand()*rad;
+  G4ThreeVector direction(sintheta*std::cos(phi),sintheta*std::sin(phi),
+                          costheta);
+
+  G4double KE = std::sqrt(cmMomentum*cmMomentum + alphaMass*alphaMass)
+              - alphaMass;
+  G4DynamicParticle* daughterparticle =
+    new G4DynamicParticle(G4MT_daughters[0], direction, KE, alphaMass);
+  products->PushProducts(daughterparticle);
+
+  KE = std::sqrt(cmMomentum*cmMomentum + nucleusMass*nucleusMass) - nucleusMass;
+  daughterparticle =
+    new G4DynamicParticle(G4MT_daughters[1], -1.0*direction, KE, nucleusMass);
+  products->PushProducts(daughterparticle);
+
+  return products;
+}
+
+
+void G4AlphaDecay::DumpInfo()
+{
+  G4cout << " G4AlphaDecay for parent nucleus " << GetParentName() << G4endl;
+  G4cout << " decays to " << GetDaughterName(0) << " + " << GetDaughterName(1)
+         << " with branching ratio " << GetBR() << " and Q value "
+         << transitionQ << G4endl;
+}
+